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Irhtemite Mineral Data

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General Irhtemite Information

Help on Chemical  Formula: Chemical Formula: Ca4Mg(AsO3OH)2(AsO4)2•4(H2O)
Help on Composition: Composition: Molecular Weight = 814.37 gm
   Calcium    19.69 %  Ca   27.54 % CaO
   Magnesium   2.98 %  Mg    4.95 % MgO
   Arsenic    36.80 %  As   56.45 % As2O5
   Hydrogen    1.24 %  H    11.06 % H2O
   Oxygen     39.29 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca4Mg(AsO3OH)2(AsO4)2•4(H2O)
Help on Environment: Environment: Probably formed from the dehydration of picopharmacolite.
Help on IMA Status: IMA Status: Approved IMA 1972
Help on Locality: Locality: Irhtem ore deposit, Morocco. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Irhtemite + Pronunciation Say IRHTEMITE

Irhtemite Image

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Comments: Pink acicular divergent microcrystals of irhtemite on matrix.
Location: Irhtem Mine, near Bou-Azzer, Ouarzazate, Morocco. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Irhtemite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.7647:1:1.1434
Help on Cell Dimensions: Cell Dimensions: a = 16.73, b = 9.48, c = 10.84, Z = 4; beta = 97.25° V = 1,705.48 Den(Calc)= 3.17
Help on Crystal System: Crystal System: Monoclinic Space Group: Unk
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.963(1), 3.242(1), 2.847(0.9),

Physical Properties of Irhtemite

Help on Color: Color: Colorless, White, Pale rose, Pink.
Help on Density: Density: 3.09
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Habit: Habit: Spherical - Spherical, rounded aggregates.
Help on Luster: Luster: Silky
Help on Streak: Streak: white

Optical Properties of Irhtemite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.049 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.023 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2013,KPDmeas= 0.2065,KC= 0.1968
Ncalc = 1.61 - 1.62
Help on Optical Data: Optical Data: Biaxial (+), a=1.634, g=1.642, bire=0.0080

Calculated Properties of Irhtemite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.07 gm/cc
note: Specific Gravity of Irhtemite =3.17 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0034407267
Boson Index = 0.9965592733
Help on Photoelectric: Photoelectric: PEIrhtemite = 27.22 barns/electron
U=PEIrhtemite x rElectron Density= 83.49 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Irhtemite is Not Radioactive

Irhtemite Classification

Help on  Dana Class: Dana Class: (39)Hydrated Acid Phosphates, etc
  (39.02)H2 (AB)5 (XO4)4 � x(H2O)
  (39.02.05)Dana Group Irhtemite Ca4Mg(AsO3OH)2(AsO4)2•4(H2O) Unk Mono
Help on  Strunz Class: Strunz Class: 08.CB.55 08 - PHOSPHATES, ARSENATES, VANADATES
  08.C - Phosphates without Additional Anions, with H2O
  08.CB -With only medium-sized cations, RO4:H2O = 1:1
08.CB.55 Irhtemite Ca4Mg(AsO3OH)2(AsO4)2•4(H2O) Unk Mono

Other Irhtemite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Irhtemite :
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

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Dana No: Strunz No: 08.CB.55





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