Clinojimthompsonite

A valid IMA mineral species

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Clinojimthompsonite

Akatani mine, Shibata City, Niigata Prefecture, Japan

Clinojimthompsonite, etc.

Akatani mine, Shibata City, Niigata Prefecture, Japan

Clinojimthompsonite, etc.

Carlton Quarry, Chester, Windsor County, Vermont, USA

Clinojimthompsonite

Akatani mine, Shibata City, Niigata Prefecture, Japan

Clinojimthompsonite, etc.

Akatani mine, Shibata City, Niigata Prefecture, Japan

Clinojimthompsonite, etc.

Carlton Quarry, Chester, Windsor County, Vermont, USA

Clinojimthompsonite

Akatani mine, Shibata City, Niigata Prefecture, Japan

Clinojimthompsonite, etc.

Akatani mine, Shibata City, Niigata Prefecture, Japan

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About ClinojimthompsoniteHide

Formula:

(Mg,Fe)₅Si₆O₁₆(OH)₂

Colour:

Colorless to pale tan-brown

Lustre:

Vitreous, Sub-Vitreous

Hardness:

2 - 2½

Specific Gravity:

3.02 (Calculated)

Crystal System:

Monoclinic

Name:

Named for James Burleigh Thompson, Jr. [November 20, 1921 Calais, Maine, USA - November 15, 2011 Lexington, Massachusetts, USA] and for being the monoclinic polymorph of jimthompsonite. He was an author of some 41 articles in international journals and professional volumes as well as 12 field guides and four geologic maps. James Thompson's career was almost entirely at Harvard University. His most widely applauded work was in "phase space" studies: "Then in 1957 with “The Graphical Analysis of Mineral Assemblages in Pelitic Schists,” he introduced graphical projections for the analysis of mineral assemblages in multicomponent systems that led to thermodynamic and conceptual tools for the analysis of chemically open systems and other tools. This work is indelibly woven into the fabric of much of the research on metamorphic rocks being published today." His memberships and awards include: member of the National Academy of Sciences, and American Academy of Arts and Sciences. He received the Arthur L. Day Medal from the Geological Society of America (1964), the Roebling Medal from the Mineralogical Society of America (1979), and the Victor M. Goldschmidt Medal from the Geo-chemical Society (1985). He received a Ford Faculty Fellowship (1952-1953), a Guggenheim Fellowship (1963), and he was an Ernst Cloos Memorial Scholar at Johns Hopkins University (1983) and a Fairchild Distinguished Scholar at California Institute of Technology (1976), among numerous distinguished lectureships. Thompson also received an honorary doctorate from Dartmouth College in Hanover, New Hampshire. He was president of the Mineralogical Society of America in 1967-1968, as well as of the Geochemical Society in 1968 and 1969. He served in the US Armed Services during WWII.

Type Locality:

ⓘ Carlton Quarry, Chester, Windsor County, Vermont, USA

Isostructural with:

'UM1993-24-SiO:CaHMg'

The Mg (or rather Mg5) analogue of UM1993-24-SiO:CaHMg.

Unique IdentifiersHide

Mindat ID:

1078

Long-form identifier:

mindat:1:1:1078:4

IMA Classification of ClinojimthompsoniteHide

IMA status:

Approved

IMA Formula:

Mg₅Si₆O₁₆(OH)₂

Approval year:

1977

First published:

1978

Classification of ClinojimthompsoniteHide

Strunz-mindat (2026):

9.DF.05

9 : SILICATES (Germanates)
D : Inosilicates
F : Inosilicates with 2-periodic multiple chains

Dana 8th ed.:

67.1.1.2

67 : INOSILICATES Unbranched Chains with W > 2
1 : Unbranched Chains with W>2 with W=3

Hey's CIM Ref.:

14.21.12

14 : Silicates not Containing Aluminum
21 : Silicates of Fe and Mg

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Symbol	Source	Reference for Standard
Cjim	IMA–CNMNC	Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of ClinojimthompsoniteHide

Lustre:

Vitreous, Sub-Vitreous

Transparency:

Transparent

Colour:

Colorless to pale tan-brown

Streak:

Colorless to white

Hardness:

2 - 2½ on Mohs scale

Tenacity:

Brittle

Cleavage:

Perfect
Theoretically {110} prefect, based on structural analysis from the type locality. The mineral is too small to observe visually.

Fracture:

Splintery

Density:

3.02 g/cm³ (Calculated)

Optical Data of ClinojimthompsoniteHide

Type:

Biaxial (-)

RI values:

n_α = 1.610 n_β = 1.630 n_γ = 1.633

2V:

Measured: 65° , Calculated: 40°

Birefringence:

0.023

Max. Birefringence:

δ = 0.023
Based on recorded range of RI values above.

Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.

Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.

Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.

Thickness: 30 µm Order divisions

Rotation:

Surface Relief:

High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).

This shows the grain boundary and Becke line effect under plane-polarised light, based on the contrast between this mineral's average refractive index and the mounting medium. It does not take into account mineral colouration.

Focus:

In focus

Interference Figure:

This shows the idealized biaxial acute bisectrix (Bxa) interference figure - the conoscopic view for a grain cut perpendicular to the acute bisectrix, using this mineral's 2V. The two small white dots mark the melatopes - the points where the two optic axes emerge - and are shown only when they fall within the field of view. The coloured bands are isochromatics, and the dark bands are isogyres.

Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.

Thickness: 30 µm

Stage rotation: 0°

Dispersion:

r > v strong

Optical Extinction:

N ∧ c ≈ 10º.

Pleochroism:

Non-pleochroic

Comments:

Clinojimthompsonite from the type locality occurs in thin streaks frequently less than 2 μm and thus may be essentially invisible in thin sections.

Chemistry of ClinojimthompsoniteHide

Mindat Formula:

(Mg,Fe)₅Si₆O₁₆(OH)₂

Element Weights:

Element	% weight
O	49.650 %
Si	29.052 %
Mg	20.951 %
H	0.348 %

Calculated from ideal end-member formula.

Elements listed:

Fe, H, Mg, O, Si - search for minerals with similar chemistry

Common Impurities:

Al,Mn,Ca,Na

Crystallography of ClinojimthompsoniteHide

Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Space Group:

B2/b

Setting:

C2/c

Cell Parameters:

a = 9.8744 Å, b = 27.243 Å, c = 5.3163 Å
β = 109.47°

Ratio:

a:b:c = 0.362 : 1 : 0.195

Unit Cell V:

1,348.35 Å³ (Calculated from Unit Cell)

Morphology:

Lath-like, splintery, to fibrous

Crystal StructureHide

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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure

ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0000688	Clinojimthompsonite	Veblen D R, Burnham C W (1978) New biopyriboles from Chester, Vermont: II. The crystal chemistry of jimthompsonite, clinojimthompsonite, and chesterite, and the amphibole-mica reaction American Mineralogist 63 1053-1073		1978		0	293

CIF Raw Data - click here to close

data_global
_chemical_name_mineral 'Clinojimthompsonite'
loop_
_publ_author_name
'Veblen D R'
'Burnham C W'
_journal_name_full 'American Mineralogist'
_journal_volume 63 
_journal_year 1978
_journal_page_first 1053
_journal_page_last 1073
_publ_section_title
;
 New biopyriboles from Chester, Vermont: II. The crystal chemistry of
 jimthompsonite, clinojimthompsonite, and chesterite, and the amphibole-mica
 reaction
;
_database_code_amcsd 0000688
_chemical_formula_sum '(Mg3.979 Fe1.021) Si6 (O18 H2)'
_cell_length_a 9.874
_cell_length_b 27.240
_cell_length_c 5.316
_cell_angle_alpha 90
_cell_angle_beta 109.5
_cell_angle_gamma 90
_cell_volume 1347.819
_exptl_crystal_density_diffrn      3.017
_symmetry_space_group_name_H-M 'C 1 2/c 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2+y,z'
  'x,-y,1/2+z'
  '1/2+x,1/2-y,1/2+z'
  '-x,y,1/2-z'
  '1/2-x,1/2+y,1/2-z'
  '-x,-y,-z'
  '1/2-x,1/2-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_U_iso_or_equiv
Mg1   0.00000   0.02890   0.25000   0.96800   0.00177
Fe1   0.00000   0.02890   0.25000   0.03200   0.00177
Mg2   0.00000   0.08490   0.75000   0.95900   0.00203
Fe2   0.00000   0.08490   0.75000   0.04100   0.00203
Mg3   0.00000   0.14280   0.25000   0.90500   0.00228
Fe3   0.00000   0.14280   0.25000   0.09500   0.00228
Mg4   0.00000   0.20130   0.75000   0.99200   0.00190
Fe4   0.00000   0.20130   0.75000   0.00800   0.00190
Fe5   0.00000   0.25690   0.25000   0.84500   0.00545
Mg5   0.00000   0.25690   0.25000   0.15500   0.00545
Si1   0.29090   0.02770   0.76560   1.00000   0.00228
Si2   0.28800   0.13590   0.76100   1.00000   0.00304
Si3   0.29710   0.19620   0.26300   1.00000   0.00317
O-H   0.11530   0.08500   0.15660   1.00000   0.00291
O1   0.34990   0.00370   0.54130   1.00000   0.00532
O2   0.11540   0.02780   0.65520   1.00000   0.00595
O3   0.34490   0.08400   0.81970   1.00000   0.00418
O4   0.11490   0.14200   0.65550   1.00000   0.00608
O5   0.35350   0.17130   0.03440   1.00000   0.00747
O6   0.35230   0.16280   0.53900   1.00000   0.00963
O7   0.12190   0.19830   0.15360   1.00000   0.00570
O8   0.37770   0.24740   0.35810   1.00000   0.00608

X-Ray Powder DiffractionHide

Powder Diffraction Data:

d-spacing	Intensity
13.6 Å	(73)
8.809 Å	(100)
6.809 Å	(16)
5.103 Å	(12)
4.734 Å	(33)
4.539 Å	(21)
4.404 Å	(11)
4.036 Å	(31)
3.991 Å	(9)
3.864 Å	(6)
3.843 Å	(7)
3.759 Å	(4)
3.590 Å	(6)
3.559 Å	(27)
3.404 Å	(2)
3.364 Å	(4)
3.250 Å	(31)
3.173 Å	(3)
3.129 Å	(5)
3.114 Å	(5)
3.083 Å	(60)
2.976 Å	(30)
2.936 Å	(7)
2.888 Å	(2)
2.816 Å	(7)
2.756 Å	(3)
2.711 Å	(6)
2.696 Å	(8)
2.639 Å	(56)
2.615 Å	(29)
2.597 Å	(8)
2.551 Å	(2)
2.506 Å	(42)
2.476 Å	(4)
2.427 Å	(5)
2.393 Å	(8)
2.352 Å	(2)
2.307 Å	(1)
2.281 Å	(10)
2.244 Å	(12)
2.235 Å	(26)
2.194 Å	(5)
2.182 Å	(29)
2.177 Å	(21)
2.153 Å	(1)
2.087 Å	(13)
2.071 Å	(4)
2.044 Å	(3)
2.027 Å	(1)

Comments:

ICDD 31-639

Geological EnvironmentHide

Paragenetic Mode(s):

Paragenetic Mode	Earliest Age (Ga)
Stage 5: Initiation of plate tectonics	<3.5-2.5
38 : Ophiolites

Type Occurrence of ClinojimthompsoniteHide

Type Locality:

ⓘ Carlton Quarry, Chester, Windsor County, Vermont, USA

General Appearance of Type Material:

An ultramicroscopic mineral intergrown in anthophyllite, jimthomsonite, and possibly chesterite. It is intergrown in "streaks" that may be only 2 μm across and thus is not possible to sight identify in type.

Place of Conservation of Type Material:

Harvard Mineralogical Museum, Cambridge, Massachusetts, USA, number 134079 (holotype).
National Museum of Natural History, Washington, D.C., USA, number 145689 (type).
Royal Ontario Museum, Toronto, Ontario, Canada, number M36083 (type).

Geological Setting of Type Material:

Metamorphosed ultramafic body.

Associated Minerals at Type Locality:

Actinolite	Anthophyllite	Chesterite	Clinochlore	Cummingtonite
Jimthompsonite	Magnetite	Talc

Synonyms of ClinojimthompsoniteHide

IMA1977-012

Other Language Names for ClinojimthompsoniteHide

Dutch:Clinojimthompsoniet

German:Klinojimthompsonit
Clinojimthompsonit

Russian:Клиноджимтомпсонит

Simplified Chinese:斜镁川石

Spanish:Clinojimthompsonita

Common AssociatesHide

Associations Based on Photo Data:

13 photos of Clinojimthompsonite associated with Jimthompsonite	(Mg,Fe)₅Si₆O₁₆(OH)₂
12 photos of Clinojimthompsonite associated with Chesterite	(Mg,Fe)₁₇Si₂₀O₅₄(OH)₆
11 photos of Clinojimthompsonite associated with Anthophyllite	◻Mg₂Mg₅(Si₈O₂₂)(OH)₂
10 photos of Clinojimthompsonite associated with Talc	Mg₃Si₄O₁₀(OH)₂
10 photos of Clinojimthompsonite associated with Magnetite	Fe²⁺Fe³⁺₂O₄
3 photos of Clinojimthompsonite associated with Pyrite	FeS₂
1 photo of Clinojimthompsonite associated with Andradite	Ca₃Fe³⁺₂(SiO₄)₃

Related Minerals - Strunz-mindat Grouping Hide

9.DF.	Bohseite	Ca₄Be_3+xAl_1-xSi₉O_25-x(OH)_3+x	Orth. mmm(2/m2/m2/m) : Cmcm
9.DF.05	Jimthompsonite	(Mg,Fe)₅Si₆O₁₆(OH)₂	Orth. mmm(2/m2/m2/m) : Pbca
9.DF.05	Chesterite	(Mg,Fe)₁₇Si₂₀O₅₄(OH)₆	Orth. mm2
9.DF.15	Ershovite	Na₄K₃(Fe,Mn,Ti)₂Si₈O₂₂(OH)₄ · 4H₂O	Tric. 1 : P1
9.DF.15	Paraershovite	Na₃K₃Fe³⁺₂Si₈O₂₀(OH)₄ · 4H₂O	Tric. 1 : P1
9.DF.20	Tvedalite	(Ca,Mn)₄Be₃Si₆O₁₇(OH)₄ · 3H₂O	Orth.
9.DF.25	Bavenite	Ca₄Be₂Al₂Si₉O₂₆(OH)₂	Orth. mm2
9.DF.30	Bigcreekite	BaSi₂O₅ · 4H₂O	Orth. mmm(2/m2/m2/m) : Pnma

Other InformationHide

Electrical:

Not believed to be fluorescent in UV

Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for ClinojimthompsoniteHide

mindat.org URL:

https://www.mindat.org/min-1078.html
Please feel free to link to this page.

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External Links:

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Raman and XRD data at RRUFF project

References and PDF downloads at RRUFF project

American Mineralogist Crystal Structure Database

Handbook of Mineralogy page PDF

Mineral Dealers:

Buy from D. Joyce minerals

References for ClinojimthompsoniteHide

Reference List:

Veblen, David R., Burnham, Charles W. (1978) New biopyriboles from Chester, Vermont: I. Descriptive mineralogy. American Mineralogist, 63 (9-10) 1000-1009

Veblen, David R., Burnham, Charles W. (1978) New biopyriboles from Chester, Vermont: II. The crystal chemistry of jimthompsonite, clinojimthompsonite, and chesterite, and the amphibole-mica reaction. American Mineralogist, 63 (11-12) 1053-1073

Papike, J. J. (1988) Chemistry of the rock‐forming silicates: Multiple‐chain, sheet, and framework structures. Reviews of Geophysics, 26 (3). 407-444 doi:10.1029/rg026i003p00407

Gait, Robert I., Veblen, David R. (1996) Chesterite, Jimthompsonite, and Clinojimthompsonite: From the Type Locality Carlton Quarry, Chester, Windsor County, Vermont. Rocks & Minerals, 71 (4) 275-280 doi:10.1080/00357529.1996.9924885

(2001) Clinojimthompsonite. Handbook of Mineralogy. Mineralogical Society of America

Localities for ClinojimthompsoniteHide

Showing 4 localities.

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the

symbol to view information about a locality. The

symbol next to localities in the list can be used to jump to that position on the map.

Hide all sections | Show all sections

Locality ListHide

- This locality has map coordinates listed.

- This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality.

- Good crystals or important locality for species.

- World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). ~~Struck out~~ - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.


Japan
Gunma Prefecture Tone District Minakami ⓘ Takaragawa hot spring	Sato & Akai (1981)
Niigata Prefecture Shibata City ⓘ Akatani mine (Akadani mine)	Tom Loomis specimen

UK
Scotland Highland North， West and Central Sutherland ⓘ Achmelvich dike	Droop (1994)

USA (TL)
Vermont Windsor County Chester ⓘ Carlton Quarry (TL)	Veblen et al. (1978) +1 other reference

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Clinojimthompsonite

About ClinojimthompsoniteHide

Unique IdentifiersHide

IMA Classification of ClinojimthompsoniteHide

Classification of ClinojimthompsoniteHide

Mineral SymbolsHide

Physical Properties of ClinojimthompsoniteHide

Optical Data of ClinojimthompsoniteHide

Chemistry of ClinojimthompsoniteHide

Crystallography of ClinojimthompsoniteHide

Crystal StructureHide

X-Ray Powder DiffractionHide

Geological EnvironmentHide

Type Occurrence of ClinojimthompsoniteHide

Synonyms of ClinojimthompsoniteHide

Other Language Names for ClinojimthompsoniteHide

Common AssociatesHide

Related Minerals - Strunz-mindat GroupingHide

Other InformationHide

Internet Links for ClinojimthompsoniteHide

References for ClinojimthompsoniteHide

Localities for ClinojimthompsoniteHide

Locality ListHide

Related Minerals - Strunz-mindat Grouping Hide