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.

Name Pronunciation:

Machatschkiite + Pronunciation

Synonym:

ICSD 31267

PDF 29-296

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 Scalenohedral H-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),

Physical Properties of Machatschkiite

Cleavage:

None

Color:

Colorless.

Density:

2.5

Diaphaneity:

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
Ncalc = 1.52 - 1.67

Optical Data:

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

Calculated Properties of Machatschkiite

Electron Density:

Bulk Density (Electron Density)=3.18 gm/cc
note: Specific Gravity of Machatschkiite =3.19 gm/cc.

Fermion Index:

Fermion Index = 0.0009850908
Boson Index = 0.9990149092

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Machatschkiite is Not Radioactive

Machatschkiite Classification

Dana Class:

39.03.08.01 (39)Hydrated Acid Phosphates, etc

(39.03)with miscellaneous formulae

(39.03.08)Dana Group

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

Strunz Class:

08.CJ.35 08 - PHOSPHATES, ARSENATES, VANADATES

08.C - Phosphates without Additional Anions, with H2O

08.CJ -With only large cations

08.CJ.35 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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Machatschkiite

Ca6(AsO4)(AsO3OH)3(PO4,SO4)•15(H2O)
Dana No: 39.03.08.01 Strunz No: 08.CJ.35
Locality:

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