Camgasite Mineral Data

Camgasite Mineral Data

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General Camgasite Information

Chemical Formula:

CaMg(AsO4)(OH)·5(H2O)

Composition:

Molecular Weight = 310.39 gm

Calcium 12.91 % Ca 18.07 % CaO

Magnesium 7.83 % Mg 12.99 % MgO

Arsenic 24.14 % As 37.02 % As₂O₅

Hydrogen 3.57 % H 31.92 % H₂O

Oxygen 51.55 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaMg(AsO₄)(OH)·5(H₂O)

IMA Status:

Approved IMA 1989

Locality:

Link to MinDat.org Location Data.

Name Origin:

Named after the composition (Ca, Mg, As).

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Camgasite Crystallography

Axial Ratios:

a:b:c =1.2031:1:2.1323

Cell Dimensions:

a = 9.18, b = 7.63, c = 16.27, Z = 4; beta = 128° V = 898.02 Den(Calc)= 2.30

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 6.42(1), 7.28(1), 4(0.8),

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Physical Properties of Camgasite

Cleavage:

[100] Indistinct, [001] Indistinct

Color:

Colorless.

Density:

2.4

Diaphaniety:

Transparent to Translucent

Hardness:

2 - Gypsum

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Camgasite

Gladstone-Dale:

CI meas= 0.013 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.029 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2393,KPDmeas= 0.2293,KC= 0.2324

Optical Data:

Biaxial (+), a=1.54, b=1.548, g=1.563, bire=0.0230, 2V(Calc)=74, 2V(Meas)=74.

Calculated Properties of Camgasite

Electron Density:

r_electron=2.41 gm/cc
note: r_Camgasite=2.40 gm/cc.

Fermion Index

Fermion Index = 0.00825
Boson Index = 0.99175

Photoelectric:

PE_Camgasite= 17.41 barns/electron
U=PE_Camgasite x r_electron= 42.00 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Camgasite is Not Radioactive

Camgasite Classification

Dana Class:

42.7.16.1 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.7)where (AB)5 (XO4)3 Zq · x(H2O)

(42.7.16)Dana Group

42.7.16.1 Camgasite CaMg(AsO4)(OH)·5(H2O) P 2₁/m 2/m

Strunz Class:

VII/D.36-20 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of very big and medium size: Al, Mg and Ca, Na, K

VII/D.36 - Kovdorskite - Gatumbaite series

VII/D.36-10 Kovdorskite Mg5(PO4)2(CO3)(OH)2·4.5(H2O) P 2₁/c 2/m

VII/D.36-20 Camgasite CaMg(AsO4)(OH)·5(H2O) P 2₁/m 2/m

VII/D.36-30 Isoclasite Ca2(PO4)(OH)·2(H2O)(?) Mono

VII/D.36-40 Gatumbaite CaAl2(PO4)2(OH)2·(H2O) P12/m,P 2,Pm Mono

Other Camgasite Information

References:

PHYS. PROP.(Am.Min.,Vol.76,p2021,1991) OPTIC PROP.(Am.Min.,Vol.76,p2021,1991)

See Also:

Links to other databases for Camgasite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Print or Cut-and-Paste your Camgasite Specimen Label here :

Camgasite

CaMg(AsO4)(OH)·5(H2O)
Dana No: 42.7.16.1 Strunz No: VII/D.36-20
Locality:

Notes: