Efremovite Mineral Data + 
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- 28.4.4.1 Langbeinite K2Mg2(SO4)3 P 213 2 3
- 28.4.4.2 Manganolangbeinite K2Mn2(SO4)3 P 213 2 3
- 28.4.4.3 Efremovite (NH4)2Mg2(SO4)3 P 213 2 3
- VI/A.03-10 Langbeinite K2Mg2(SO4)3 P 213 2 3
- VI/A.03-20 Manganolangbeinite K2Mn2(SO4)3 P 213 2 3
- VI/A.03-30 Efremovite (NH4)2Mg2(SO4)3 P 213 2 3
General Efremovite Information |
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 Chemical Formula: |
(NH4)2Mg2(SO4)3 | ||
| Composition: |
Molecular Weight = 372.88 gm | ||
| Magnesium 13.04 % Mg 21.62 % MgO | |||
| Hydrogen 2.16 % H - % Calc as (NH4)2O | |||
| Sulfur 25.80 % S 64.42 % SO3 | |||
| Nitrogen 7.51 % N 13.97 % (NH4)2O | |||
| Oxygen 51.49 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Empirical Formula: |
(NH4)2Mg2(SO4)3 | ||
| Environment: |
Secondary mineral associated with organic material and oxidizable sulfides. | ||
| IMA Status: |
Approved IMA 1989 | ||
| Locality: |
Chelyabinsk coal Basin, Ural Mts, Russia. Link to MinDat.org Location Data. | ||
| Name Origin: |
Named for Ivan Antonovich Yefremov (1907-1972), Russian geologist. | ||
Efremovite Image | |||
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Images:
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Efremovite Crystallography |
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| Cell Dimensions: |
a = 9.99, Z = 4; V = 997.00 Den(Calc)= 2.48 | ||
| Crystal System: |
Isometric - TetartoidalH-M Symbol (2 3) Space Group: P 213 | ||
| X Ray Diffraction: |
By Intensity(I/Io): 3.15(1), 4.07(0.7), 2.668(0.5), | ||
Physical Properties of Efremovite |
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| Cleavage: |
None | ||
| Color: |
Gray white, White. | ||
| Diaphaniety: |
Subtranslucent to Opaque | ||
| Hardness: |
2 - Gypsum | ||
| Luster: |
Vitreous - Dull | ||
| Streak: |
white | ||
Optical Properties of Efremovite |
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| Gladstone-Dale: |
CI calc= -0.41 (Poor) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2218,KC= 0.1573 |
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| Optical Data: |
Isotropic, n=1.55. | ||
Calculated Properties of Efremovite |
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| Electron Density: |
relectron=2.53 gm/cc |
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| Fermion Index |
Fermion Index = 0.09007 Boson Index = 0.90993 |
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| Photoelectric: |
PEEfremovite = 1.85 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Efremovite is Not Radioactive |
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Efremovite Classification |
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| Dana Class: |
28.4.4.3 (28)Anhydrous Acid and Sulfates | ||
| (28.4)with miscellaneous formulae | |||
| (28.4.4)Dana Group | |||
| Strunz Class: |
VI/A.03-30 VI - Sulfates,Chromates,Molybdates and Tungstates | ||
| VI/A - Waterfree sulfates [SO4]2- without unfamiliar anions. cations of medium and very big size | |||
| VI/A.03 - Langbeinite - Efremovite series | |||
Other Efremovite Information |
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| References: |
PHYS. PROP.(Am.Min.,Vol.76,p299,1991) OPTIC PROP.(Am.Min.,Vol.76,p299,1991) | ||
| See Also: |
Links to other databases for Efremovite : 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 Efremovite using: Visit our Advertisers for Efremovite : Translate Efremovite Mineral Data : Ask about Efremovite here : Print or Cut-and-Paste your Efremovite Specimen Label here :
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