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Vuagnatite
A valid IMA mineral species
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About Vuagnatite
Marc B. Vuagnat
Formula:
CaAl(SiO4)(OH)
Colour:
Colourless, light blue, tan, brown
Lustre:
Vitreous
Hardness:
6
Specific Gravity:
3.42
Crystal System:
Orthorhombic
Member of:
Name:
Named in honor of Prof Dr. Marc Bernard Vuagnat (30 January 1922 - 23 March 2015), professor of geology, University of Geneva, Switzerland, "in recognition of his work spanning some twenty-five years in the field of ophiolites".
A rare Ca-Al-silicate which, however, "may occur widely in prehnite-hydrogrossular assemblages" (Craw et al., 1979).
An occurrence in rodingites seems typical.
An occurrence in rodingites seems typical.
Unique Identifiers
Mindat ID:
4212
Long-form identifier:
mindat:1:1:4212:9
IMA Classification of Vuagnatite
Approved
IMA Formula:
CaAlSiO4(OH)
Approval year:
1975
First published:
1976
Classification of Vuagnatite
9.AG.60
9 : SILICATES (Germanates)
A : Nesosilicates
G : Nesosilicates with additional anions; cations in > [6] +- [6] coordination
9 : SILICATES (Germanates)
A : Nesosilicates
G : Nesosilicates with additional anions; cations in > [6] +- [6] coordination
52.4.2.2
52 : NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
4 : Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] and/or >[6] coordination
52 : NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
4 : Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] and/or >[6] coordination
16.9.7
16 : Silicates Containing Aluminum and other Metals
9 : Aluminosilicates of Ca
16 : Silicates Containing Aluminum and other Metals
9 : Aluminosilicates of Ca
Mineral Symbols
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 |
|---|---|---|
| Vgn | 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 Vuagnatite
Vitreous
Transparency:
Translucent
Colour:
Colourless, light blue, tan, brown
Hardness:
6 on Mohs scale
Tenacity:
Brittle
Fracture:
Conchoidal
Density:
3.42(2) g/cm3 (Measured) 3.41 g/cm3 (Calculated)
Optical Data of Vuagnatite
Type:
Biaxial (-)
RI values:
nα = 1.701(2) nβ = 1.724(2) nγ = 1.727(2)
2V:
Measured: 44° (1), Calculated: 46°
Max. Birefringence:
δ = 0.026
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 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.
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.
Surface Relief:
Very High (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:
Strong to very strong, r < v.
Optical Extinction:
X = c; Y = b; Z = a.
Pleochroism:
Visible
Comments:
X = colorless or yellowish brown; Y = Z = colorless.
Comments:
Absorption: X >> Y = Z.
Chemistry of Vuagnatite
Mindat Formula:
CaAl(SiO4)(OH)
Element Weights:
Common Impurities:
H2O,Fe,Ti
Crystallography of Vuagnatite
Crystal System:
Orthorhombic
Class (H-M):
222 - Disphenoidal
Space Group:
P212121
Cell Parameters:
a = 7.0538(4) Å, b = 8.5410(4) Å, c = 5.6839(3) Å
Ratio:
a:b:c = 0.826 : 1 : 0.665
Unit Cell V:
342.44 ų (Calculated from Unit Cell)
Z:
4
Crystallographic forms of Vuagnatite
Crystal Atlas:
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Vuagnatite - Prismatic {110}
3d models and HTML5 code kindly provided by
www.smorf.nl.
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Crystal Structure
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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) |
|---|---|---|---|---|---|---|---|
| 0000525 | Vuagnatite | McNear E, Vincent M G, Parthe E (1976) The crystal structure of vuagnatite, CaAl(OH)SiO4 American Mineralogist 61 831-838 |  | 1976 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Loading XRD data...
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.518 Å | (100) |
| 2.997 Å | (95) |
| 2.640 Å | (85) |
| 2.215 Å | (85) |
| 2.453 Å | (70) |
| 2.142 Å | (65) |
| 2.395 Å | (60) |
Comments:
Red Mountain, California, USA. Data from Pabst et al. (1977).
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 3b: Earth’s earliest hydrosphere | >4.45 |
| 13 : Hadean serpentinization |
Type Occurrence of Vuagnatite
General Appearance of Type Material:
Anhedral and intimately intergrown with other calcium silicates and chlorite. As a replacement of plagioclase. Crystals from 0.03 to 0.5 mm in diameter. Frequently included by clinochlore, vesuvianite and hydrogrossular.
Place of Conservation of Type Material:
Natural History Museum, Geneva, 435/1; University of Geneva, Geneva, Switzerland; National Museum of Natural History, Washington, D.C., USA, 146560.
Geological Setting of Type Material:
In rodingitized pegmatitic anorthositic gabbro dykes, cross-cutting harzburgite-serpentinite from an ophiolitic zone.
Associated Minerals at Type Locality:
Synonyms of Vuagnatite
Other Language Names for Vuagnatite
Relationship of Vuagnatite to other Species
Member of:
Other Members of Adelite-Descloizite Group:
| Adelite | CaMg(AsO4)(OH) | Orth. 222 : P212121 |
| Arsendescloizite | PbZn(AsO4)(OH) | Orth. 222 : P212121 |
| Austinite | CaZn(AsO4)(OH) | Orth. 222 : P212121 |
| Čechite | PbFe2+(VO4)(OH) | Orth. mmm(2/m2/m2/m) |
| Cobaltaustinite | CaCo(AsO4)(OH) | Orth. 222 : P212121 |
| Conichalcite | CaCu(AsO4)(OH) | Orth. 222 : P212121 |
| Descloizite | PbZn(VO4)(OH) | Orth. mmm(2/m2/m2/m) : Pnma |
| Duftite | PbCu(AsO4)(OH) | Orth. 222 : P212121 |
| 'Duftite-alpha' | PbCu(AsO4)(OH) | |
| Gottlobite | CaMg(VO4)(OH) | Orth. 222 : P212121 |
| Hermannroseite | CaCu(PO4)(OH) | Orth. 222 : P212121 |
| Mottramite | PbCu(VO4)(OH) | Orth. mmm(2/m2/m2/m) : Pnma |
| Nickelaustinite | CaNi(AsO4)(OH) | Orth. 222 : P212121 |
| Plumbogottlobite | PbMg(VO4)(OH) | Orth. mmm(2/m2/m2/m) : Pnma |
| Pyrobelonite | PbMn2+(VO4)(OH) | Orth. mmm(2/m2/m2/m) : Pnma |
| Tangeite | CaCu(VO4)(OH) | Orth. 222 : P212121 |
| 'Unnamed (Pb-analogue of Nickelaustinite)' | PbNi(AsO4)(OH) |
Structurally related to group(s):
| Tilasite Group | A group of monoclinic arsenates. |
Common Associates
Associations Based on Photo Data:
| 10 photos of Vuagnatite associated with Mcguinnessite | (Mg,Cu)2(CO3)(OH)2 |
| 2 photos of Vuagnatite associated with Piemontite-(Sr) | (CaSr)(AlAlMn3+)O[Si2O7][SiO4](OH) |
Related Minerals - Strunz-mindat Grouping
| 9.AG. | Aluminotaipingite-(CeCa) | (Ce6Ca3)◻Al(SiO4)3[SiO3(OH)]4F3 |
| 9.AG. | 'Ivanyukite-Na-T' | Na2Ti4(SiO4)3(OH)O3 · 7H2O |
| 9.AG. | 'Ivanyukite-Na-C' | Na2Ti4(SiO4)3(OH)2O2 · 6H2O |
| 9.AG. | Edgrewite | Ca9(SiO4)4F2 |
| 9.AG.02 | Gatedalite | ZrMn2+2Mn3+4SiO12 |
| 9.AG.05 | Abswurmbachite | CuMn3+6(SiO4)O8 |
| 9.AG.05 | Neltnerite | CaMn3+6(SiO4)O8 |
| 9.AG.05 | Skogbyite | Zr(Mg2Mn3+4)SiO12 |
| 9.AG.05 | Braunite | Mn2+Mn3+6(SiO4)O8 |
| 9.AG.05 | 'Braunite-II' | Ca(Mn3+,Fe)14(SiO4)O20 |
| 9.AG.10 | Långbanite | Mn2+4Mn3+9Sb5+O16(SiO4)2 |
| 9.AG.12 | Taipingite-(CeCa) | (Ce7Ca2)◻Mg(SiO4)3[SiO3(OH)]4F3 |
| 9.AG.15 | Żabińskiite | Ca[Al0.5(Ta,Nb)0.5)]O(SiO4) |
| 9.AG.15 | Titanite | CaTiO(SiO4) |
| 9.AG.15 | Vanadomalayaite | CaVO(SiO4) |
| 9.AG.15 | Natrotitanite | (Na0.5Y0.5)TiO(SiO4) |
| 9.AG.15 | Malayaite | CaSnO(SiO4) |
| 9.AG.20 | Ferricerite-(LaCa) | (La6Ca3)◻Fe3+(SiO4)3(SiO3OH)4(OH)3 |
| 9.AG.20 | Aluminocerite-(CeCa) | (Ce6Ca3)◻Al(SiO4)3[SiO3(OH)]4(OH)3 |
| 9.AG.20 | Cerite-(CeCa) | (Ce7Ca2)◻Mg(SiO4)3(SiO3OH)4(OH)3 |
| 9.AG.20 | Nipeiite-(Ce) | Ce9Fe3+(SiO4)6[SiO3(OH)](OH)3 |
| 9.AG.25 | 'Yftisite-(Y)' | (Y,Dy,Er)4(Ti,Sn)(SiO4)2O(F,OH)6 |
| 9.AG.25 | Mieite-(Y) | Y4Ti(SiO4)2O[F,(OH)]6 |
| 9.AG.25 | Trimounsite-(Y) | Y2Ti2(SiO4)O5 |
| 9.AG.30 | Sitinakite | KNa2Ti4(SiO4)2O5(OH) · 4H2O |
| 9.AG.35 | Kittatinnyite | Ca2Mn2Mn(SiO4)2(OH)4 · 9H2O |
| 9.AG.40b | Paranatisite | Na2Ti(SiO4)O |
| 9.AG.40a | Natisite | Na2Ti(SiO4)O |
| 9.AG.45 | Törnebohmite-(Ce) | Ce2Al(SiO4)2(OH) |
| 9.AG.45 | Törnebohmite-(La) | La2Al(SiO4)2(OH) |
| 9.AG.50 | Ivanyukite-Na | Na2Ti4(SiO4)3(OH)2O2 · 6H2O |
| 9.AG.50 | Ivanyukite-K | K2Ti4(SiO4)3(OH)2O2 · 9H2O |
| 9.AG.50 | Ivanyukite-Cu | CuTi4(SiO4)3(OH)2O2 · 7H2O |
| 9.AG.50 | Kuliokite-(Y) | Y4Al(SiO4)2(OH)2F5 |
| 9.AG.50 | Hydroxyledgrewite | Ca9(SiO4)4(OH)2 |
| 9.AG.52 | Ulfanderssonite-(Ce) | (Ce15Ca)Σ16Mg2(SiO4)10(SiO3OH)(OH,F)5Cl3 |
| 9.AG.55 | Chantalite | CaAl2(SiO4)(OH)4 |
| 9.AG.60 | Mozartite | CaMn3+(SiO4)(OH) |
| 9.AG.65 | Hatrurite | Ca3(SiO4)O |
| 9.AG.70 | Jasmundite | Ca11(SiO4)4O2S |
| 9.AG.75 | Afwillite | Ca3[SiO4][SiO2(OH)2] · 2H2O |
| 9.AG.80 | Bultfonteinite | Ca2(HSiO4)F · H2O |
| 9.AG.85 | Zoltaiite | BaV4+2V3+12(SiO4)2O19 |
| 9.AG.90 | Tranquillityite | (Fe2+,Ca)8(Zr,Y)2Ti3(SiO4)3O12 |
Other Information
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 Vuagnatite
mindat.org URL:
https://www.mindat.org/min-4212.html
Please feel free to link to this page.
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References for Vuagnatite
Reference List:
Sarp, Halil; Bertrand, Jean; Mc Near, Elizabeth (1976) Vuagnatite, CaAl(OH)SiO4, a new natural calcium aluminum nesosilicate. American Mineralogist, 61 (9-10). 825-830
Mc Near, Elizabeth; Vincent, Michael G.; Parthé, Erwin (1976) The crystal structure of vuagnatite, CaAl(OH)SiO4. American Mineralogist, 61 (9-10). 831-838
Sarp, Halil; Bertrand, Jean; Mc Near, Elizabeth (1976) Vuagnatite, CaAl(OH)SiO4, a new natural calcium aluminum nesosilicate. American Mineralogist, 61 (9-10). 825-830
Localities for Vuagnatite
Showing 19 localities.
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Czech Republic | |
| Tasáryová et al. (2014) |
Greece | |
| Hatzipanagiotou et al. (2003) |
| Hatzipanagiotou et al. (2003) | |
| Pelletier et al. (2008) | |
Japan | |
| Yamada (2004) |
| Mineralogical Journal Vol. 13 (1986) |
| rruff.geo.arizona.edu (n.d.) |
| Yamada (2004) | |
Kazakhstan | |
| Pilitsyna et al. (2018) |
New Zealand | |
| Craw et al. (1979) +1 other reference |
| rruff.geo.arizona.edu (n.d.) +1 other reference |
Poland | |
| SZUSZKIEWICZ et al. (2013) |
South Africa | |
| Cairncross et al. (1995) |
Turkey (TL) | |
| Sarp et al. (1976) |
| Sarp et al. (1977) | |
USA | |
| Erd et al. (1977) |
| Erd et al. (1977) +2 other references |
| Erd et al. (1977) | |
| Erd et al. (1977) +2 other references |
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Copper King Mine, Red Mountain, Red Mountain Mining District, Mendocino County, California, USA