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Posnjakite Mineral Data + |
General Posnjakite Information |
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| Cu4(SO4)(OH)6·(H2O) | |||
| Molecular Weight = 470.31 gm | |||
| Copper 54.05 % Cu 67.65 % CuO | |||
| Hydrogen 1.71 % H 15.32 % H2O | |||
| Sulfur 6.82 % S 17.02 % SO3 | |||
| Oxygen 37.42 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Cu4(SO4)(OH)6·(H2O) | |||
| Approved IMA 1967 | |||
| Link to MinDat.org Location Data. | |||
| Named after the geochemist, E. W. Posnjak (1888-1949). | |||
| ICSD 100276 | |||
| PDF 43-670 | |||
Posnjakite Image | |||
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Posnjakite Crystallography |
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| a:b:c =2.2454:1:1.6673 | |||
| a = 14.236, b = 6.34, c = 10.571, Z = 4; beta = 102.917° V = 929.96 Den(Calc)= 3.36 | |||
| Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c | |||
| By Intensity(I/Io): 6.94(1), 3.47(0.3), 2.7(0.25), | |||
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Physical Properties of Posnjakite |
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| [???] Perfect | |||
| Blue, Dark blue. | |||
| 3.4 | |||
| Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern. | |||
| Crystalline - Fine - Occurs as well-formed fine sized crystals. | |||
| Encrustations - Forms crust-like aggregates on matrix. | |||
| Platy - Sheet forms (e.g. micas). | |||
| 2.5-3 - Finger Nail-Calcite | |||
| Vitreous (Glassy) | |||
| greenish blue | |||
Optical Properties of Posnjakite |
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| CI meas= 0 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= -0.011 (Superior) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.1995,KPDmeas= 0.1972,KC= 0.1972 |
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| Biaxial (-), a=1.625, b=1.68, g=1.706, bire=0.0810, 2V(Calc)=66, 2V(Meas)=57. | |||
Calculated Properties of Posnjakite |
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relectron=3.30 gm/cc |
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| Fermion Index = 0.00069 Boson Index = 0.99931 |
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PEPosnjakite = 23.94 barns/electron |
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| GRapi = 0 (Gamma Ray American Petroleum Institute Units) Posnjakite is Not Radioactive |
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Posnjakite Classification |
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| 31.4.1.1 (31)Hydrated Sulfates Containing Hydroxyl or Halogen | |||
| (31.4)where (A+ B++)4 (XO4) Zq·x(H2O) | |||
| (31.4.1)Dana Group | |||
| VI/D.03-10 VI - Sulfates,Chromates,Molybdates and Tungstates | |||
| VI/D - Water-bearing sulfates with unfamiliar anions. cations of medium size | |||
| VI/D.03 - Langite series, Posnjakite - Nakuriite | |||
Other Posnjakite Information |
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| NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) | |||
| Links to other databases for Posnjakite : 1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 -Athena 5 - Crocoite.com Mineral Locations 6 - EUROmin Project 7 -Google Images 8 -Google Scholar 9 -Handbook of Mineralogy (UofA) 10 -MinDAT 11 -MinMax(Deutsch) 12 -MinMax(English) 13 -Mineralienatlas (Deutsch) 14 -QUT Mineral Atlas 15 - WWW-MINCRYST 16 -École des Mines de Paris Search for Posnjakite using: Visit our Advertisers for Posnjakite : Translate Posnjakite Mineral Data : Ask about Posnjakite here : Print or Cut-and-Paste your Posnjakite Specimen Label here :
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