Irhtemite Mineral Data

Irhtemite Mineral Data
Search Webmineral :
   
Home Crystal jmol jPOWD Chem X Ray Dana Strunz Properties A to Z Images       News Help About



[Newest Minerals] [Equipment] [Analytical Services] [About Us] [Mineral Gallery] [eBay Store]
See Also: [Diamond Crystals] [Mineral News] [Hudson Institute] [Minerals on CDROM]
Rare Minerals, Meteorites, Equipment and Analytical Services
Excalibur Mineral Company, World leaders in the supply of rare species
Serving the scientific and collector communities since 1974


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

Click Here for Larger Irhtemite Image in a New Browser Window Images:
Click Here for Larger Irhtemite Image

Irhtemite

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: MonoclinicSpace 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: 39.02.05.01 (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
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 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info

Search for Irhtemite using:

Google
 
Web webmineral.com
[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Irhtemite :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Diamond Dan Publications

e-Rocks Auctions

Excalibur Minerals

Exceptional Minerals


Heliodor

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Irhtemite Mineral Data :

Ask about Irhtemite 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 Espaņol

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

Irhtemite

Ca4Mg(AsO3OH)2(AsO4)2•4(H2O)
Dana No: 39.02.05.01 Strunz No: 08.CB.55
Locality:

 

Notes: