Irhtemite Mineral Data

General Irhtemite Information

Chemical Formula: Ca4Mg(AsO3OH)2(AsO4)2•4(H2O) 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 Empirical Formula: Ca₄Mg(AsO₃OH)₂(AsO₄)₂•4(H₂O) Environment: Probably formed from the dehydration of picopharmacolite. IMA Status: Approved IMA 1972 Locality: Irhtem ore deposit, Morocco. Link to MinDat.org Location Data. Name Origin: Named for the locality. Name Pronunciation: Irhtemite + Pronunciation  

Irhtemite Image

Images:

Irhtemite Crystallography

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

Physical Properties of Irhtemite

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

Optical Properties of Irhtemite

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 Optical Data: Biaxial (+), a=1.634, g=1.642, bire=0.0080  

Calculated Properties of Irhtemite

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

Irhtemite Classification

Dana Class: 39.02.05.01 (39)Hydrated Acid Phosphates, etc   (39.02)H2 (AB)5 (XO4)4 · x(H2O)   (39.02.05)Dana Group  

39.02.05.01 Irhtemite Ca4Mg(AsO3OH)2(AsO4)2•4(H2O) Unk Mono

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

References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) 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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Ask about Irhtemite here :
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