[New Updates] [Gallery 1] [Gallery 2] [Gallery 3] [Rock Shop Gallery] Serving the mineral collector and educator community since 1970 Over 900,000 mineral specimens in stock New minerals acquired weekly - Wright's Rock Shop General Efremovite Information(NH4)2Mg2(SO4)3 |
Molecular Weight = 372.88 gm |
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Magnesium 13.04 % Mg 21.62 % MgO |
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Hydrogen 2.16 % H - % Calc as (NH4)2O |
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Sulfur 25.80 % S 64.42 % SO3 |
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Nitrogen 7.51 % N 13.97 % (NH4)2O |
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Oxygen 51.49 % O |
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100.00 % 100.00 % = TOTAL OXIDE |
(NH4)2Mg2(SO4)3 |
Secondary mineral associated with organic material and oxidizable sulfides. |
Approved IMA 1989 |
Chelyabinsk coal Basin, Ural Mts, Russia. Link to MinDat.org Location Data. |
Named for Ivan Antonovich Yefremov (1907-1972), Russian geologist. |
Efremovite + Pronunciation |
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Efremovite Crystallographya = 9.99, Z = 4; V = 997.00 Den(Calc)= 2.48 |
Isometric - TetartoidalH-M Symbol (2 3) Space Group: P 213 |
By Intensity(I/Io): 3.15(1), 4.07(0.7), 2.668(0.5), |
| Physical Properties of EfremoviteNone |
Gray white, White. |
Subtranslucent to Opaque |
2 - Gypsum |
Vitreous - Dull |
white |
| Optical Properties of Efremovite CI calc= -0.41 (Poor) - where the CI = (1-KPDcalc/KC) |
KPDcalc= 0.2218,KC= 0.1573 Ncalc = 1.39 Isotropic, n=1.55. |
| Calculated Properties of EfremoviteBulk Density (Electron Density)=2.53 gm/cc |
note: Specific Gravity of Efremovite =2.48 gm/cc. Fermion Index = 0.09 |
Boson Index = 0.91 PEEfremovite = 1.85 barns/electron |
U=PEEfremovite x rElectron Density= 4.68 barns/cc. GRapi = 0 (Gamma Ray American Petroleum Institute Units) |
Efremovite is Not Radioactive | Efremovite Classification28.04.04.03 (28)Anhydrous Acid and Sulfates |
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(28.04)with miscellaneous formulae |
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(28.04.04)Langbeinite Series |
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07.AC.10 07 - SULFATES (SELENATES, TELLURATES) |
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07.A - Sulfates (selenates, etc.) without Additional Anions, without H2O |
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07.AC -With medium-sized and large cations |
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| Other Efremovite InformationPHYS. PROP.(Am.Min.,Vol.76,p299,1991) OPTIC PROP.(Am.Min.,Vol.76,p299,1991) |
Links to other databases for Efremovite : |
1 - Am. Min. Crystal Structure Database 2 - Athena 3 - EUROmin Project 4 - Ecole des Mines de Paris 5 - Google Images 6 - Google Scholar 7 - Handbook of Mineralogy (MinSocAm) 8 - Handbook of Mineralogy (UofA) 9 - MinDAT 10 - MinMax(Deutsch) 11 - MinMax(English) 12 - Mineralienatlas (Deutsch) 13 - QUT Mineral Atlas 14 - Ruff.Info Search for Efremovite using: Visit our Advertisers for Efremovite : AA Mineral SpecimensB & L Fine Minerals Crystalarium.com Dan Weinrich Fine Minerals Dan Weinrich Auctions Dakota Matrix Desert Winds Gems and Minerals Excalibur Minerals Exceptional Minerals Fabre Minerals Heliodor John Betts Fine Minerals Mason's Minerals Mineral News Mineral of the Month Club Wrights Rock Shop Translate Efremovite Mineral Data : Ask about Efremovite here : Print or Cut-and-Paste your Efremovite Specimen Label here :
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