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Camgasite

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Formula:
CaMg(AsO4)(OH) · 5H2O
System:
Monoclinic
Colour:
Colourless
Hardness:
2
Name:
Named for Ca Mg As
This page provides mineralogical data about Camgasite.

Classification of Camgasite

Approved
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
42.7.16.1

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
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Type Occurrence of Camgasite

General Appearance of Type Material:
euhedral to anhedral crystals, to 0.15
mm, prismatic along [010]; faces: {100}, {010}, {001}; also radial aggregates in crusts
Year of Discovery:
1989
Geological Setting of Type Material:
secondary mineral in a Co–U-rich zone within a polymetallic mineral deposit

Physical Properties of Camgasite

Vitreous
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
Colourless
Hardness (Mohs):
2

Crystallography of Camgasite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Cell Parameters:
a = 9.18Å, b = 7.63Å, c = 16.27Å
β = 128°
Ratio:
a:b:c = 1.203 : 1 : 2.132
Unit Cell Volume:
V 898.02 ų (Calculated from Unit Cell)
Z:
4
X-Ray Powder Diffraction Data:
d-spacingIntensity
7.28 (10)
6.42 (10)
4.00 (8)
3.28 (8)
3.21 (8)
3.02 (8)
2.96 (8)

Optical Data of Camgasite

Type:
Biaxial (+)
RI values:
nα = 1.540 nβ = 1.548 nγ = 1.563
2V:
Measured: 74° , Calculated: 74°
Max Birefringence:
δ = 0.023
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
r < v

Chemical Properties of Camgasite

Formula:
CaMg(AsO4)(OH) · 5H2O
All elements listed in formula:
Analytical Data:
Electron microprobe, water by difference
As2O5 37.9
MgO 12.9
CaO 18.9
H2O 30.3

total 100.0
Empirical Formula:
Ca1.06Mg1.01(AsO4)1.04(OH)1.02•4.82H2O

Relationship of Camgasite to other Species

8.DJ.05JohnwalkiteK(Mn2+,Fe2+,Fe3+)2(Nb5+,Ta5+)(PO4)2O2 · 2(H2O,OH)
8.DJ.05OlmsteaditeKFe22+(Nb5+,Ta5+)(PO4)2O2 · 2H2O
8.DJ.10GatumbaiteCaAl2(PO4)2(OH)2 · H2O
8.DJ.20Phosphofibrite(H2O,K)3.5Fe8(PO4)6(OH)7 · 5H2O
8.DJ.20Meurigite-KKFe83+(PO4)6(OH)7 · 6.5H2O
8.DJ.20Meurigite-NaNaFe83+(PO4)6(OH)7 · 6.5H2O
8.DJ.25JungiteCa2Zn4Fe83+(PO4)9(OH)9 · 16H2O
8.DJ.30WycheproofiteNaAlZr(PO4)2(OH) · H2O
8.DJ.35ErcititeNa2Mn23+(PO4)2(OH)2 · 4H2O
8.DJ.40MrázekiteBi2Cu3(PO4)2O2(OH)2 · H2O
8.DJ.45AttikaiteCa3Cu2Al2(AsO4)4(OH)4 · 2H2O
20.2.1BearsiteBe2(AsO4)(OH) · 4H2O
20.2.2BrassiteMg(HAsO4) · 4H2O
20.2.3RössleriteMg(HAsO4) · 7H2O
20.2.4HörnesiteMg3(AsO4)2 · 8H2O
20.2.5WeiliteCa(HAsO4)
20.2.6JohnbaumiteCa5(AsO4)3OH
20.2.7HaidingeriteCaHAsO4 · H2O
20.2.8PharmacoliteCa(HAsO4) · 2H2O
20.2.9SainfelditeCaCa2Ca2(AsO4)2(HAsO4)2 · 4H2O
20.2.10VladimiriteCa4(AsO4)2(AsO3OH) · 4H2O
20.2.11GuériniteCa5(AsO4)2(HAsO4)2 · 9H2O
20.2.12FerrarisiteCa5(AsO4)2(HAsO4)2 · 9H2O
20.2.13RauenthaliteCa3(AsO4)2 · 10H2O
20.2.14PhaunouxiteCa3(AsO4)2 · 11H2O
20.2.15McneariteNaCa5(AsO4)(HAsO4)4 · 4H2O
20.2.16BergslagiteCaBeAsO4(OH)
20.2.17AdeliteCaMg(AsO4)(OH)
20.2.18TalmessiteCa2Mg(AsO4)2 · 2H2O
20.2.19IrhtemiteCa4Mg(AsO4)2(HAsO4)2 · 4H2O
20.2.21PicropharmacoliteCa4Mg(AsO4)2(HAsO4)2 · 11H2O
20.2.22BariopharmacosideriteBa0.5Fe43+(AsO4)3(OH)4 · 5H2O

Other Names for Camgasite

Name in Other Languages:
German:Camgasit
Spanish:Camgasita

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.

References for Camgasite

Reference List:
American Mineralogist: 76: 2021.

Aufschluss: 40: 369-372.

Anthony, J.W., Bideaux, R.A., Bladh, K.W. and Nichols, M.C., Eds. Handbook of Mineralogy, Mineralogical Society of America, Chantilly, VA 20151-1110, USA. http://www.handbookofmineralogy.org/ (2016)

Internet Links for Camgasite

Localities for Camgasite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Germany (TL)
 
  • Baden-Württemberg
    • Black Forest
      • Schenkenzell
        • Wittichen
          • Burgfelsen
American Mineralogist: 76: 2021.
Mineral and/or Locality  
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