| Clairite Mineral Data |
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- 31.10.8.1 Clairite (NH4)2Fe3(SO4)4(OH)3·3(H2O) Unk Tri
- VI/D.15-10 Sideronatrite Na2Fe(SO4)2(OH)·3(H2O) Pbnm 2/m 2/m 2/m
- VI/D.15-20 Metasideronatrite Na2Fe(SO4)2(OH)·(H2O) Pbnm or Pbn21 Ortho
- VI/D.15-30 Clairite (NH4)2Fe3(SO4)4(OH)3·3(H2O) Unk Tri
General Clairite Information |
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 Chemical Formula: |
(NH4)2Fe+++3(SO4)4(OH)3·3(H2O) | ||
| 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 | |||
| Empirical Formula: |
(NH4)2Fe3+3(SO4)4(OH)3·3(H2O) | ||
| Environment: |
Formed from the reaction of the oxidation products of pyrite with ammonia produced by the decay of organic matter. | ||
| IMA Status: |
Approved IMA 1983 | ||
| Locality: |
Lone Creek Fall cave, near Sbri, eastern Transvaal, South Africa. Link to MinDat.org Location Data. | ||
| 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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Images:
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Clairite Crystallography |
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| Axial Ratios: |
a:b:c =1.0238:1:5.7497 | ||
| 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 | ||
| Crystal System: |
TriclinicSpace Group: Unk | ||
| X Ray Diffraction: |
By Intensity(I/Io): 8.78(1), 17.5(1), 3.27(0.25), | ||
Physical Properties of Clairite |
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| Cleavage: |
[001] Perfect | ||
| Color: |
Yellow. | ||
| Density: |
2.31 | ||
| Diaphaniety: |
Transparent | ||
| Hardness: |
2 - Gypsum | ||
Optical Properties of Clairite |
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| 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 |
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| Optical Data: |
Biaxial (?), a=1.595, g=1.607, bire=0.0120 | ||
| Pleochroism (x): |
pale yellow. | ||
| Pleochroism (z): |
dark yellow. | ||
Calculated Properties of Clairite |
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| Electron Density: |
relectron=2.33 gm/cc |
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| Fermion Index |
Fermion Index = 0.04703 Boson Index = 0.95297 |
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| Photoelectric: |
PEClairite = 8.16 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Clairite is Not Radioactive |
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Clairite Classification |
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| Dana Class: |
31.10.8.1 (31)Hydrated Sulfates Containing Hydroxyl or Halogen | ||
| (31.10)miscellaneous | |||
| (31.10.8)Dana Group | |||
| Strunz Class: |
VI/D.15-30 VI - Sulfates,Chromates,Molybdates and Tungstates | ||
| VI/D - Water-bearing sulfates with unfamiliar anions. cations of medium and very big size | |||
| VI/D.15 - Sideronatrite - Clairite series | |||
Other Clairite Information |
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| References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8) | ||
| See Also: |
Links to other databases for Clairite : 1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris Search for Clairite using: Visit our Advertisers for Clairite : Translate Clairite Mineral Data : Ask about Clairite here : Print or Cut-and-Paste your Clairite Specimen Label here :
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