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Manandonite
A valid IMA mineral species - grandfathered
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About Manandonite
Formula:
Li2Al4(Si2AlB)O10(OH)8
Colour:
Crystals - white; globules - dull yellow
Lustre:
Pearly
Hardness:
2½ - 3½
Specific Gravity:
2.76 - 2.89
Crystal System:
Orthorhombic
Member of:
Name:
Named by A. Lacroix in 1912 for the Manandona River near the type locality Antandrokomby pegmatite, Madagascar.
Unique Identifiers
Mindat ID:
2559
Long-form identifier:
mindat:1:1:2559:7
IMA Classification of Manandonite
Approved, 'Grandfathered' (first described prior to 1959)
First published:
1912
Classification of Manandonite
9.ED.15
9 : SILICATES (Germanates)
E : Phyllosilicates
D : Phyllosilicates with kaolinite layers composed of tetrahedral and octahedral nets
9 : SILICATES (Germanates)
E : Phyllosilicates
D : Phyllosilicates with kaolinite layers composed of tetrahedral and octahedral nets
71.1.2c.6
71 : PHYLLOSILICATES Sheets of Six-Membered Rings
1 : Sheets of 6-membered rings with 1:1 layers
71 : PHYLLOSILICATES Sheets of Six-Membered Rings
1 : Sheets of 6-membered rings with 1:1 layers
17.5.1
17 : Silicates Containing other Anions
5 : Borosilicates
17 : Silicates Containing other Anions
5 : Borosilicates
Mineral Symbols
As of 2021 there are now IMAāCNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMAāCNMNC symbol. Older variants are listed for historical use only.
Please only use the official IMAāCNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Mnd | IMAāCNMNC | Warr, L.N. (2021). IMAāCNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Mnd | Warr (2020) | Warr, L.N. (2020) Recommended abbreviations for the names of clay minerals and associated phases. Clay Minerals, 55, 261ā264 doi:10.1180/clm.2020.30 |
Physical Properties of Manandonite
Pearly
Transparency:
Transparent, Translucent
Comment:
Pearly on cleavages
Colour:
Crystals - white; globules - dull yellow
Streak:
White
Hardness:
2½ - 3½ on Mohs scale
Cleavage:
Perfect
{001}
{001}
Density:
2.76 - 2.89 g/cm3 (Measured) 2.79 g/cm3 (Calculated)
Optical Data of Manandonite
Type:
Biaxial (+)
RI values:
nα = 1.604(5) nβ = 1.604(5) nγ = 1.61
2V:
Measured: 10° to 15°
Max. Birefringence:
δ = 0.006
Based on recorded range of RI values above.
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 Āµm 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.
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 Āµm 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.
Surface Relief:
Moderate (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
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.
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.
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.
Dispersion:
r < v weak
Comments:
Pseudo-uniaxial.
Z perpendicular to {001}
Z perpendicular to {001}
Chemistry of Manandonite
Mindat Formula:
Li2Al4(Si2AlB)O10(OH)8
Element Weights:
Common Impurities:
Mn,Mg,Ca,Na,K,H20
Crystallography of Manandonite
Crystal System:
Orthorhombic
Class (H-M):
222 - Disphenoidal
Space Group:
C2221
Cell Parameters:
a = 5.057(4) Å, b = 8.765(7) Å, c = 13.769(9) Å
Ratio:
a:b:c = 0.577 : 1 : 1.571
Unit Cell V:
610.31 Ć
Ā³ (Calculated from Unit Cell)
Z:
2
Morphology:
Micaceous pseudohexagonal plates, fanlike lamellar aggregates, or as globules.
Twinning:
Commonly twinned around [001] prducing pseudohexagonal crystals.
Crystal Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
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Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
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View
CIF File Best | x | y | z | a | b | c
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Rotation
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Labels
Console Off | On | Grey | Yellow
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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) |
|---|---|---|---|---|---|---|---|
| 0001732 | Manandonite | Zheng H, Bailey S W (1995) The crystal structure of manandonite-2H2 American Mineralogist 80 387-393 |  | 1995 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 6.92 Ć | (100) |
| 3.447 Ć | (80) |
| 2.376 Ć | (35) |
| 4.362 Ć | (25) |
| 2.489 Ć | (15) |
| 1.863 Ć | (15) |
| 4.158 Ć | (10) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 34 : Complex granite pegmatites |
Type Occurrence of Manandonite
Place of Conservation of Type Material:
n.d.
Geological Setting of Type Material:
A complex type LCT pegmatite hosted in a metadolomite.
Associated Minerals at Type Locality:
Other Language Names for Manandonite
Relationship of Manandonite to other Species
Member of:
Other Members of Kaolinite-Serpentine Group:
| Greenalite | (Fe2+,Fe3+)2-3Si2O5(OH)4 | Mon. |
| Kaolinite Subgroup | Al2Si2O5(OH)4 | |
| Odinite | (Fe,Mg,Al,Fe,Ti,Mn)2.4((Si,Al)2O5)(OH)4 | Mon. m : Bm |
| Serpentine Subgroup | D3[Si2O5](OH)4 |
Common Associates
Associations Based on Photo Data:
| 11 photos of Manandonite associated with Tourmaline | AD3G6(T6O18)(BO3)3X3Z |
| 6 photos of Manandonite associated with Quartz | SiO2 |
| 5 photos of Manandonite associated with Albite | Na(AlSi3O8) |
| 3 photos of Manandonite associated with Elbaite | Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH) |
| 2 photos of Manandonite associated with 'Rubellite' | |
| 1 photo of Manandonite associated with Microcline | K(AlSi3O8) |
| 1 photo of Manandonite associated with Brockite | (Ca,Th,Ce)PO4 Ā· H2O |
Related Minerals - Strunz-mindat Grouping
| 9.ED. | 'Clinochrysotile' | Mg3(Si2O5)(OH)4 |
| 9.ED.05 | Dickite | Al2(Si2O5)(OH)4 |
| 9.ED.05 | Nacrite | Al2(Si2O5)(OH)4 |
| 9.ED.05 | Kaolinite | Al2(Si2O5)(OH)4 |
| 9.ED.05 | Odinite | (Fe,Mg,Al,Fe,Ti,Mn)2.4((Si,Al)2O5)(OH)4 |
| 9.ED.10 | Halloysite | Al2Si2O5(OH)4 Ā· n(H2O) |
| 9.ED.10 | Hisingerite | Fe3+2(Si2O5)(OH)4 Ā· 2H2O |
| 9.ED.10 | 'Hydrohalloysite' | Al2Si2O5(OH)4 Ā· 2H2O |
| 9.ED.15 | Antigorite | Mg3(Si2O5)(OH)4 |
| 9.ED.15 | Brindleyite | (Ni,Al)3(Si,Al)2O5(OH)4 |
| 9.ED.15 | Fraipontite | (Zn,Al)3((Si,Al)2O5)(OH)4 |
| 9.ED.15 | NĆ©pouite | Ni3Si2O5(OH)4 |
| 9.ED.15 | Pecoraite | Ni3(Si2O5)(OH)4 |
| 9.ED.15 | Guidottiite | Mn2Fe3+(Fe3+SiO5)(OH)4 |
| 9.ED.15 | Lizardite | Mg3(Si2O5)(OH)4 |
| 9.ED.15 | Berthierine | (Fe2+,Fe3+,Al)3(Si,Al)2O5(OH)4 |
| 9.ED.15 | Kellyite | Mn2+2Al(AlSiO5)(OH)4 |
| 9.ED.15 | Cronstedtite | Fe2+2Fe3+((Si,Fe3+)2O5)(OH)4 |
| 9.ED.15 | Caryopilite | Mn2+3Si2O5(OH)4 |
| 9.ED.15 | Amesite | Mg2Al(AlSiO5)(OH)4 |
| 9.ED.15 | Greenalite | (Fe2+,Fe3+)2-3Si2O5(OH)4 |
| 9.ED.20 | Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 Ā· nH2O, x < 1 |
| 9.ED.20 | Neotocite | (Mn,Fe)SiO3 Ā· H2O (?) |
| 9.ED.20 | Allophane | (Al2O3)(SiO2)1.3-2 Ā· 2.5-3H2O |
| 9.ED.20 | Imogolite | Al2SiO3(OH)4 |
| 9.ED.25 | Bismutoferrite | Fe3+2Bi(SiO4)2(OH) |
| 9.ED.25 | Chapmanite | Fe3+2Sb3+(Si2O5)O3(OH) |
| 9.ED.30 | 'Pianlinite' | Al2Si2O6(OH)2 |
Other Information
Notes:
The thermal behavior and infrared spectrum can be used to differentiate manandonite from cookeite.
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 Manandonite
mindat.org URL:
https://www.mindat.org/min-2559.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Manandonite
Reference List:
Lacroix, Alfred (1912) Sur une nouvelle espĆØce minĆ©rale (manandonite) des pegmatites de Madagascar. Bulletin de MinĆ©ralogie, 35 (4) 223-226 doi:10.3406/bulmi.1912.3519
Spencer, L. J. (1913) A (sixth) list of new mineral names. Mineralogical Magazine and Journal of the Mineralogical Society, 16 (77) 352-378 doi:10.1180/minmag.1913.016.77.09
Lacroix, Alfred (1915) Manandonite et cookƩite. Bulletin de MinƩralogie, 38 (4) 142-146 doi:10.3406/bulmi.1915.3618
Ranorosoa, Nadine, Fontan, Francois, Fransolet, AndrƩ-Mathieu (1989) Rediscovery of manandonite in the Sahatany Valley, Madagascar. European Journal of Mineralogy, 1 (5) 633-638 doi:10.1127/ejm/1/5/0633
Jambor, John L.; Puziewicz, Jacek (1990) New Mineral Names. American Mineralogist, 75 (9-10). 1209-1216
Localities for Manandonite
Showing 4 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ā - 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).
All localities listed without proper references should be considered as questionable.
Madagascar (TL) | |
| Lacroix (1912) +1 other reference |
| Ranorosoa (1986) |
| Ranorosoa (1986) |
USA | |
| Bideaux et al. (1960) +1 other reference |
Quick NavTopAbout ManandoniteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence Other LanguagesRelationshipsCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Antandrokomby pegmatite, Manandona Valley, Sahatsiho Ambohimanjaka, Ambositra District, Amoron'i Mania, Madagascar