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Apjohnite Mineral Data + |
General Apjohnite Information |
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| MnAl2(SO4)4·22(H2O) | |||
| Molecular Weight = 889.49 gm | |||
| Manganese 6.18 % Mn 7.98 % MnO | |||
| Aluminum 6.07 % Al 11.46 % Al2O3 | |||
| Hydrogen 4.99 % H 44.56 % H2O | |||
| Sulfur 14.42 % S 36.00 % SO3 | |||
| Oxygen 68.35 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Mn2+Al2(SO4)4·22(H2O) | |||
| Valid Species (Pre-IMA) 1838 | |||
| Link to MinDat.org Location Data. | |||
| ICSD 14038 | |||
| PDF 29-886 | |||
Apjohnite Image | |||
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Apjohnite Crystallography |
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| a:b:c =0.2545:1:0.8734 | |||
| a = 6.198, b = 24.347, c = 21.266, Z = 4; beta = 100.28° V = 3,157.58 Den(Calc)= 1.87 | |||
| Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/c | |||
| By Intensity(I/Io): 3.52(1), 4.82(0.9), 3.79(0.35), | |||
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Mouse |
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Physical Properties of Apjohnite |
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| Colorless, White, Pale yellow, Pale green, Pale pink. | |||
| 1.8 | |||
| Transparent | |||
| Encrustations - Forms crust-like aggregates on matrix. | |||
| Fibrous - Crystals made up of fibers. | |||
| 1.5-2 - Talc-Gypsum | |||
| None. | |||
| Silky | |||
| Nonmagnetic | |||
| white | |||
Optical Properties of Apjohnite |
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| CI meas= -0.049 (Good) - where the CI = (1-KPDmeas/KC) CI calc= -0.009 (Superior) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.257,KPDmeas= 0.267,KC= 0.2547 |
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| Biaxial (-), a=1.478, b=1.482, g=1.482, bire=0.0040, 2V(Calc)=0, 2V(Meas)=0-15. Dispersion none. | |||
| none. | |||
| none. | |||
| none. | |||
Calculated Properties of Apjohnite |
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relectron=1.95 gm/cc |
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| Fermion Index = 0.00141 Boson Index = 0.99859 |
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PEApjohnite = 2.64 barns/electron |
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| GRapi = 0 (Gamma Ray American Petroleum Institute Units) Apjohnite is Not Radioactive |
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Apjohnite Classification |
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| 29.7.3.3 (29)Hydrated Acid and Sulfates | |||
| (29.7)where A (B)2 (XO4)4 · x(H2O) | |||
| (29.7.3)Halotrichite Group (Monoclinic with 22 H2O) | |||
| VI/C.12-30 VI - Sulfates,Chromates,Molybdates and Tungstates | |||
| VI/C - Water-bearing sulfates without unfamiliar anions. cations of medium and very big size | |||
| VI/C.12 - Halotrichite group, Pickeringite - Bilinite | |||
Other Apjohnite Information |
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| NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32) | |||
| Links to other databases for Apjohnite : 1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris Search for Apjohnite using: Visit our Advertisers for Apjohnite : Translate Apjohnite Mineral Data : Ask about Apjohnite here : Print or Cut-and-Paste your Apjohnite Specimen Label here :
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