Isoclasite Mineral Data

Isoclasite Mineral Data +

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General Isoclasite Information

Chemical Formula:

Ca2(PO4)(OH)·2(H2O) (?)

Composition:

Molecular Weight = 228.17 gm

Calcium 35.13 % Ca 49.16 % CaO

Phosphorus 13.58 % P 31.11 % P₂O₅

Hydrogen 2.21 % H 19.74 % H₂O

Oxygen 49.09 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₂(PO₄)(OH)·2(H₂O)

Environment:

Found with chalcedony and dolomite. An inadequately described species.

IMA Status:

Valid Species (Pre-IMA) 1870

Locality:

Jachymov, Zapadocesky Kraj, Bohemia, Czech Republic. Link to MinDat.org Location Data.

Name Origin:

Named from the Greek for "equal" and "fracture", in allusion to the cleavage.

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Isoclasite Crystallography

Crystal System:

Monoclinic

Physical Properties of Isoclasite

Cleavage:

[010] Distinct

Color:

Colorless, White.

Density:

2.92

Diaphaniety:

Transparent to Translucent

Habit:

Fibrous - Crystals made up of fibers.

Hardness:

1.5 - Between Talc and Gypsum

Luster:

Vitreous - Pearly

Optical Properties of Isoclasite

Gladstone-Dale:

CI meas= 0.14 (Poor) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.1955,KC= 0.2273

Optical Data:

Biaxial (+), a=1.565, b=1.568, g=1.58, bire=0.0150, 2V(Calc)=54, 2V(Meas)=medium.

Calculated Properties of Isoclasite

Electron Density:

r_electron=2.97 gm/cc
note: r_Isoclasite=2.92 gm/cc.

Fermion Index

Fermion Index = 0.00071
Boson Index = 0.99929

Photoelectric:

PE_Isoclasite= 4.93 barns/electron
U=PE_Isoclasite x r_electron= 14.64 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Isoclasite is Not Radioactive

Isoclasite Classification

Dana Class:

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

(42.6)where (AB)2 (XO4) Zq · x(H2O)

(42.6.2)Dana Group

42.6.2.1 Isoclasite Ca2(PO4)(OH)·2(H2O)(?) Mono

Strunz Class:

VII/D.36-30 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 Isoclasite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

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

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Isoclasite

Ca2(PO4)(OH)·2(H2O) (?)
Dana No: 42.6.2.1 Strunz No: VII/D.36-30
Locality:

Notes: