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General Irhtemite Information |
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 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  |
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Irhtemite Image | |||
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Images:
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Irhtemite Crystallography |
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| 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/Io): 2.963(1), 3.242(1), 2.847(0.9), | ||
Physical Properties of Irhtemite |
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| 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 |
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| 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 |
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| Optical Data: |
Biaxial (+), a=1.634, g=1.642, bire=0.0080 | ||
Calculated Properties of Irhtemite |
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| Electron Density: |
Bulk Density (Electron Density)=3.07 gm/cc note: Specific Gravity of Irhtemite =3.17 gm/cc. |
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| Fermion Index: |
Fermion Index = 0.0034407267 Boson Index = 0.9965592733 |
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| Photoelectric: |
PEIrhtemite = 27.22 barns/electron U=PEIrhtemite x rElectron Density= 83.49 barns/cc. |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Irhtemite is Not Radioactive |
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Irhtemite Classification |
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| 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 | |||
| 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 | |||
Other Irhtemite Information |
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| 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 Search for Irhtemite using: Visit our Advertisers for Irhtemite : A Bijoux Google Search for IrhtemiteAdam's Minerals Google Search for Irhtemite Cape Minerals Google Search for Irhtemite Dakota Matrix Minerals Google Search for Irhtemite Excalibur Mineral Corp. Google Search for Irhtemite Exceptional Minerals Google Search for Irhtemite John Betts Fine Minerals Search for Irhtemite McDougall Minerals Google Search for Irhtemite Mineral News Website Link Rock and Mineral Shows Google Search for Irhtemite Weinrich Minerals, Inc. Google Search for Irhtemite Ask about Irhtemite here : Print or Cut-and-Paste your Irhtemite Specimen Label here :
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