![]() |
Irhtemite Mineral Data |
General Irhtemite Information |
|||
![]() |
Ca4Mg(AsO3OH)2(AsO4)2•4(H2O) | ||
![]() |
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 | |||
![]() |
Ca4Mg(AsO3OH)2(AsO4)2•4(H2O) | ||
![]() |
Probably formed from the dehydration of picopharmacolite. | ||
![]() |
Approved IMA 1972 | ||
![]() |
Irhtem ore deposit, Morocco. Link to MinDat.org Location Data. | ||
![]() |
Named for the locality. | ||
![]() |
Irhtemite + Pronunciation ![]() |
||
Irhtemite Image | |||
![]() |
|
||
Irhtemite Crystallography |
|||
![]() |
a:b:c =1.7647:1:1.1434 | ||
![]() |
a = 16.73, b = 9.48, c = 10.84, Z = 4; beta = 97.25° V = 1,705.48 Den(Calc)= 3.17 | ||
![]() |
Monoclinic Space Group: Unk | ||
![]() |
By Intensity(I/Io): 2.963(1), 3.242(1), 2.847(0.9), | ||
Physical Properties of Irhtemite |
|||
![]() |
Colorless, White, Pale rose, Pink. | ||
![]() |
3.09 | ||
![]() |
Transparent to Translucent | ||
![]() |
Spherical - Spherical, rounded aggregates. | ||
![]() |
Silky | ||
![]() |
white | ||
Optical Properties of Irhtemite |
|||
![]() |
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 |
||
![]() |
Biaxial (+), a=1.634, g=1.642, bire=0.0080 | ||
Calculated Properties of Irhtemite |
|||
![]() |
Bulk Density (Electron Density)=3.07 gm/cc note: Specific Gravity of Irhtemite =3.17 gm/cc. |
||
![]() |
Fermion Index = 0.0034407267 Boson Index = 0.9965592733 |
||
![]() |
PEIrhtemite = 27.22 barns/electron U=PEIrhtemite x rElectron Density= 83.49 barns/cc. |
||
![]() |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Irhtemite is Not Radioactive |
||
Irhtemite Classification |
|||
![]() |
39.02.05.01 (39)Hydrated Acid Phosphates, etc | ||
(39.02)H2 (AB)5 (XO4)4 � x(H2O) | |||
(39.02.05)Dana Group | |||
![]() |
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 |
|||
![]() |
NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) | ||
![]() |
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 : Ask about Irhtemite here : Print or Cut-and-Paste your Irhtemite Specimen Label here :
|
||
Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.