Camgasite
A valid IMA mineral species
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Formula:
CaMg(AsO4)(OH) · 5H2O
Colour:
Colourless
Lustre:
Vitreous
Hardness:
2
Crystal System:
Monoclinic
Name:
Named for its chemical composition (Ca, Mg, As).
This page provides mineralogical data about Camgasite.
Unique Identifiers
Mindat ID:
874
Long-form identifier:
mindat:1:1:874:3
IMA Classification of Camgasite
Classification of Camgasite
8.DJ.15
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
J : With large and medium-sized cations, (OH, etc.):RO4 = 1:1
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
J : With large and medium-sized cations, (OH, etc.):RO4 = 1:1
42.7.16.1
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
7 : (AB)2(XO4)Zq·xH2O
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
7 : (AB)2(XO4)Zq·xH2O
20.2.20
20 : Arsenates (also arsenates with phosphate, but without other anions)
2 : Arsenates of Be, Mg, Ca or Ba
20 : Arsenates (also arsenates with phosphate, but without other anions)
2 : Arsenates of Be, Mg, Ca or Ba
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 |
|---|---|---|
| Cmg | 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 Camgasite
Optical Data of Camgasite
Type:
Biaxial (+)
RI values:
nα = 1.54 nβ = 1.548 nγ = 1.563
2V:
Measured: 74° , Calculated: 74°
Max. Birefringence:
δ = 0.023
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:
Moderate
Dispersion:
r < v
Chemistry of Camgasite
Mindat Formula:
CaMg(AsO4)(OH) · 5H2O
Element Weights:
Crystallography of Camgasite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Cell Parameters:
a = 9.18 Å, b = 7.63 Å, c = 16.27 Å
β = 128°
β = 128°
Ratio:
a:b:c = 1.203 : 1 : 2.132
Unit Cell V:
898.02 ų (Calculated from Unit Cell)
Z:
4
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.28 Å | (10) |
| 6.42 Å | (10) |
| 4.00 Å | (8) |
| 3.28 Å | (8) |
| 3.21 Å | (8) |
| 3.02 Å | (8) |
| 2.96 Å | (8) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] |
Type Occurrence of Camgasite
General Appearance of Type Material:
Forms crusts on an adit wall which consist of euhedral to anhedral crystals, to 0.15 mm, prismatic along [010]; faces: {100}, {010}, {001}; also radial aggregates in crusts.
Place of Conservation of Type Material:
Stuttgart University, Stuttgart, Germany, number JO1k,1.
Geological Setting of Type Material:
Secondary mineral in a Co–U-rich zone within a polymetallic mineral deposit.
Associated Minerals at Type Locality:
Synonyms of Camgasite
Other Language Names for Camgasite
Related Minerals - Strunz-mindat Grouping
| 8.DJ.05 | Johnwalkite | K(Mn2+,Fe2+,Fe3+)2(Nb5+,Ta5+)(PO4)2O2 · 2(H2O,OH) |
| 8.DJ.05 | Olmsteadite | KFe2+2(Nb5+,Ta5+)(PO4)2O2 · 2H2O |
| 8.DJ.10 | Gatumbaite | CaAl2(PO4)2(OH)2 · H2O |
| 8.DJ.20 | Meurigite-K | KFe3+8(PO4)6(OH)7 · 6.5H2O |
| 8.DJ.20 | Phosphofibrite | (H2O,K)3.5Fe8(PO4)6(OH)7 · 5H2O |
| 8.DJ.20 | Meurigite-Na | NaFe3+8(PO4)6(OH)7 · 6.5H2O |
| 8.DJ.25 | Jungite | Ca2Zn4Fe3+8(PO4)9(OH)9 · 16H2O |
| 8.DJ.30 | Wycheproofite | NaAlZr(PO4)2(OH) · H2O |
| 8.DJ.35 | Ercitite | Na2Mn3+2(PO4)2(OH)2 · 4H2O |
| 8.DJ.40 | Mrázekite | Bi2Cu3(PO4)2O2(OH)2 · H2O |
| 8.DJ.45 | Attikaite | Ca3Cu2Al2(AsO4)4(OH)4 · 2H2O |
| 8.DJ.50 | Mengeite | Ba(Mg,Mn2+)Mn3+4(PO4)4(OH)4 · 4H2O |
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 Camgasite
mindat.org URL:
https://www.mindat.org/min-874.html
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Please feel free to link to this page.
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References for Camgasite
Localities for Camgasite
Showing 1 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.
Germany (TL) | |
| American Mineralogist: 76: 2021. |
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