Machatschkiite Mineral Data

Machatschkiite Mineral Data +

General Machatschkiite Information

Chemical Formula:

Ca6(AsO4)(AsO3OH)3(PO4,SO4)·15(H2O)

Composition:

Molecular Weight = 1,424.07 gm

Calcium 16.89 % Ca 23.63 % CaO

Arsenic 21.04 % As 32.28 % As₂O₅

Phosphorus 1.52 % P 3.49 % P₂O₅

Hydrogen 2.34 % H 20.87 % H₂O

Sulfur 6.76 % S 16.87 % SO₃

Oxygen 51.46 % O

______ ______

100.00 % 97.14 % = TOTAL OXIDE

Empirical Formula:

Ca₆(AsO₄)(AsO₃OH)₃(PO₄)_0.7(SO₄)₃·15(H₂O)

Environment:

Secondary mineral in crusts on granite.

IMA Status:

Approved IMA 1977

Locality:

Anton mine, Heubachtal, near Schiltach, black Forest, Germany. Link to MinDat.org Location Data.

Name Origin:

Named for Felix Karl Ludwig Machatschki (1895-1970), Professor of Mineralogy, University of Vienna, Austria.

Synonym:

ICSD 31267

PDF 29-296

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Machatschkiite Crystallography

Axial Ratios:

a:c = 1:1.48548

Cell Dimensions:

a = 15.127, c = 22.471, Z = 6; V = 4,453.06 Den(Calc)= 3.19

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3c

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

By Intensity(I/I_o): 8.59(1), 3.59(0.8), 5.34(0.8),

Crystal Structure:

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Effenberger H , Mereiter K , Pimminger M , Zemann J , Tschermaks Mineralogische und Petrographische Mitteilungen , 30 (1982) p.145-155, Machatschkiite: Crystal structure and revision of the chemical formula, Locality: Grube Anton Heubachtal, Schiltach, Black Forest, Germany

Physical Properties of Machatschkiite

Cleavage:

None

Color:

Colorless.

Density:

2.5

Diaphaniety:

Transparent to Translucent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Pseudo Rhombohedral - Crystals show a rhombohedral outline.

Hardness:

2-3 - Gypsum-Calcite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Machatschkiite

Gladstone-Dale:

CI meas= -0.127 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.117 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1846,KPDmeas= 0.2356,KC= 0.2091

Optical Data:

Uniaxial (-), e=1.585, w=1.593, bire=0.0080.

Calculated Properties of Machatschkiite

Electron Density:

r_electron=3.18 gm/cc
note: r_{Machatschkiite}=3.19 gm/cc.

Fermion Index

Fermion Index = 0.00098
Boson Index = 0.99902

Photoelectric:

PE_{Machatschkiite}= 16.31 barns/electron
U=PE_{Machatschkiite} x r_electron= 51.88 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Machatschkiite is Not Radioactive

Machatschkiite Classification

Dana Class:

39.3.8.1 (39)Hydrated Acid Phosphates, etc

(39.3)with miscellaneous formulae

(39.3.8)Dana Group

39.3.8.1 Machatschkiite Ca6(AsO4)(AsO3OH)3(PO4,SO4)·15(H2O) R 3c 3 2/m

Strunz Class:

VII/C.27-10 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions, cations of medium and big size: Fe, Mn, Zn, Mg and Ca, (NH4)1+

VII/C.27 - Machatschkiite series

VII/C.27-10 Machatschkiite Ca6(AsO4)(AsO3OH)3(PO4,SO4)·15(H2O) R 3c 3 2/m

Other Machatschkiite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Machatschkiite :
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 - WWW-MINCRYST 13 -École des Mines de Paris

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

Machatschkiite

Ca6(AsO4)(AsO3OH)3(PO4,SO4)·15(H2O)
Dana No: 39.3.8.1 Strunz No: VII/C.27-10
Locality:

Notes: