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Krohnkite Mineral Data |
General Krohnkite Information |
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Na2Cu(SO4)2•2(H2O) | ||
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Molecular Weight = 337.68 gm | ||
Sodium 13.62 % Na 18.35 % Na2O | |||
Copper 18.82 % Cu 21.19 % Cu2O | |||
Hydrogen 1.19 % H 10.67 % H2O | |||
Sulfur 18.99 % S 47.42 % SO3 | |||
Oxygen 47.38 % O | |||
______ ______ | |||
100.00 % 97.63 % = TOTAL OXIDE | |||
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Na2Cu(SO4)2•2(H2O) | ||
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Secondary mineral in copper-bearing sulfide deposits. | ||
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Valid Species (Pre-IMA) 1876 | ||
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Chuquicamata, Calama, Antofag�sta Province, Chile. Link to MinDat.org Location Data. | ||
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Named after B. Kroehnke, who was the first person to analyze it. | ||
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Kroehnkite | ||
Krohnkite Image | |||
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Krohnkite Crystallography |
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a:b:c =0.4584:1:0.4356 | ||
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a = 5.8, b = 12.651, c = 5.512, Z = 2; beta = 108.45° V = 383.66 Den(Calc)= 2.92 | ||
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Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/c | ||
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By Intensity(I/Io): 6.32(1), 3.28(0.75), 2.928(0.65), | ||
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Physical Properties of Krohnkite |
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{010} Perfect, {011} Good | ||
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Blue, Dark sky blue, Greenish blue, Yellowish green. | ||
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2.06 - 2.9, Average = 2.48 | ||
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Transparent to Translucent | ||
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Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz). | ||
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Encrustations - Forms crust-like aggregates on matrix. | ||
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Fibrous - Crystals made up of fibers. | ||
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Massive - Fibrous - Distinctly fibrous fine-grained forms. | ||
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2.5-3 - Finger Nail-Calcite | ||
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Vitreous (Glassy) | ||
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white | ||
Optical Properties of Krohnkite |
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CI meas= -0.132 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= 0.039 (Excellent) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.1967,KPDmeas= 0.2316,KC= 0.2047 Ncalc = 1.42 - 1.6 |
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Biaxial (-), a=1.544, b=1.578, g=1.601, bire=0.0570, 2V(Calc)=76, 2V(Meas)=78.7. | ||
Calculated Properties of Krohnkite |
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Bulk Density (Electron Density)=2.89 gm/cc note: Specific Gravity of Krohnkite =2.92 gm/cc. |
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Fermion Index = 0.0016535964 Boson Index = 0.9983464036 |
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PEKrohnkite = 9.42 barns/electron U=PEKrohnkite x rElectron Density= 27.20 barns/cc. |
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GRapi = 0 (Gamma Ray American Petroleum Institute Units) Krohnkite is Not Radioactive |
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Krohnkite Classification |
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29.03.02.01 (29)Hydrated Acid and Sulfates | ||
(29.03)where (A+)2 B (XO4)2 � x(H2O) | |||
(29.03.02)Dana Group | |||
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07.CC.30 07 - SULFATES (SELENATES, TELLURATES) | ||
07.C - Sulfates (selenates, etc.) without Additional Anions, with H2O | |||
07.CC -With medium-sized and large cations | |||
Other Krohnkite Information |
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NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32) | ||
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Links to other databases for Krohnkite : 1 - Am. Min. Crystal Structure Database 2 - Athena 3 - EUROmin Project 4 - GeoScienceWorld 5 - Google Images 6 - Google Scholar 7 - Handbook of Mineralogy (MinSocAm) 8 - Handbook of Mineralogy (UofA) 9 - MinDAT 10 - Mineralienatlas (Deutsch) 11 - Online Mineral Museum 12 - QUT Mineral Atlas 13 - Ruff.Info 14 - WWW-MINCRYST Search for Krohnkite using: Visit our Advertisers for Krohnkite : Ask about Krohnkite here : Print or Cut-and-Paste your Krohnkite Specimen Label here :
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