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Clairite Mineral Data

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General Clairite Information

Help on Chemical  Formula: Chemical Formula: (NH4)2Fe+++3(SO4)4(OH)3•3(H2O)
Help on Composition: Composition: Molecular Weight = 692.94 gm
   Iron      24.18 %  Fe   34.57 % Fe2O3
   Hydrogen   1.16 %  H      -   % Calc as (NH4)2O
   Hydrogen   1.31 %  H    11.70 % H2O
   Sulfur    18.51 %  S    46.22 % SO3
   Nitrogen   4.04 %  N     7.52 % (NH4)2O
   Oxygen    50.80 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: (NH4)2Fe3+3(SO4)4(OH)3•3(H2O)
Help on Environment: Environment: Formed from the reaction of the oxidation products of pyrite with ammonia produced by the decay of organic matter.
Help on IMA Status: IMA Status: Approved IMA 1983
Help on Locality: Locality: Lone Creek Fall cave, near Sbri, eastern Transvaal, South Africa. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Claire Martini (1936-), South African, wife of the describer of the species, Jacques Edouard Martini.

Clairite Image

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  Clairite   Rostite

Comments: Brownish crystals of clairite on white massive rostite.
Location: Anna Mine, Alsdorf, Aachen, North Rhine-Westphalia, Germany. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Clairite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.0238:1:5.7497
Help on Cell Dimensions: Cell Dimensions: a = 9.368, b = 9.15, c = 52.61, Z = 4; alpha = 88.15°, beta = 90°, gamma = 118.36° V = 3,966.27 Den(Calc)= 1.16
Help on Crystal System: Crystal System: Triclinic Space Group: Unk
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 8.78(1), 17.5(1), 3.27(0.25),

Physical Properties of Clairite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Yellow.
Help on Density: Density: 2.31
Help on Diaphaneity: Diaphaneity: Transparent
Help on Hardness: Hardness: 2 - Gypsum

Optical Properties of Clairite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.129 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -1.248 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.5181,KPDmeas= 0.2602,KC= 0.2305
Ncalc = 1.27 - 1.53
Help on Optical Data: Optical Data: Biaxial (?), a=1.595, g=1.607, bire=0.0120
Help on Pleochroism (x): Pleochroism (x): pale yellow.
Help on Pleochroism (z): Pleochroism (z): dark yellow.

Calculated Properties of Clairite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.33 gm/cc
note: Specific Gravity of Clairite =2.31 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PEClairite = 8.16 barns/electron
U=PEClairite x rElectron Density= 18.99 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Clairite is Not Radioactive

Clairite Classification

Help on  Dana Class: Dana Class: (31)Hydrated Sulfates Containing Hydroxyl or Halogen
  (31.10.08)Dana Group Clairite (NH4)2Fe3(SO4)4(OH)3•3(H2O) Unk Tri
Help on  Strunz Class: Strunz Class: 07.DF.55 07 - SULFATES (SELENATES, TELLURATES)
  07.D - Sulfates (selenates, etc.) with additional anions, with H2O
  07.DF -With large and medium-sized cations
07.DF.55 Clairite (NH4)2Fe3(SO4)4(OH)3•3(H2O) Unk Tri

Other Clairite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Clairite :
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: 07.DF.55





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