Mineralogy Database

Machatschkiite Mineral Data

Search Webmineral :

General Machatschkiite Information

Help on Chemical  Formula: Chemical Formula: Ca6(AsO4)(AsO3OH)3(PO4,SO4)•15(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Ca6(AsO4)(AsO3OH)3(PO4)0.7(SO4)3•15(H2O)
Help on Environment: Environment: Secondary mineral in crusts on granite.
Help on IMA Status: IMA Status: Approved IMA 1977
Help on Locality: Locality: Anton mine, Heubachtal, near Schiltach, black Forest, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Felix Karl Ludwig Machatschki (1895-1970), Professor of Mineralogy, University of Vienna, Austria.
Help on Name Pronunciation: Name Pronunciation: Machatschkiite + Pronunciation Say MACHATSCHKIITE
Help on Synonym: Synonym: ICSD 31267
  PDF 29-296

Machatschkiite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.48548
Help on Cell Dimensions: Cell Dimensions: a = 15.127, c = 22.471, Z = 6; V = 4,453.06 Den(Calc)= 3.19
Help on Crystal System: 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/Io): 8.59(1), 3.59(0.8), 5.34(0.8),

Physical Properties of Machatschkiite

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless.
Help on Density: Density: 2.5
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Pseudo Rhombohedral - Crystals show a rhombohedral outline.
Help on Hardness: Hardness: 2-3 - Gypsum-Calcite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Machatschkiite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Uniaxial (-), e=1.585, w=1.593, bire=0.0080.

Calculated Properties of Machatschkiite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.18 gm/cc
note: Specific Gravity of Machatschkiite =3.19 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0009850908
Boson Index = 0.9990149092
Help on Photoelectric: Photoelectric: PEMachatschkiite = 16.31 barns/electron
U=PEMachatschkiite x rElectron Density= 51.88 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Machatschkiite is Not Radioactive

Machatschkiite Classification

Help on  Dana Class: Dana Class: (39)Hydrated Acid Phosphates, etc
  (39.03)with miscellaneous formulae
  (39.03.08)Dana Group Machatschkiite Ca6(AsO4)(AsO3OH)3(PO4,SO4)•15(H2O) R 3c 3 2/m
Help on  Strunz Class: 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

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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

Search for Machatschkiite using:

Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Machatschkiite :

Ask about Machatschkiite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espa´┐Żol

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


Dana No: Strunz No: 08.CJ.35





Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.