Mineralogy Database

Efremovite Mineral Data

Search Webmineral :

General Efremovite Information

Help on Chemical  Formula: Chemical Formula: (NH4)2Mg2(SO4)3
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: (NH4)2Mg2(SO4)3
Help on Environment: Environment: Secondary mineral associated with organic material and oxidizable sulfides.
Help on IMA Status: IMA Status: Approved IMA 1989
Help on Locality: Locality: Chelyabinsk coal Basin, Ural Mts, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Ivan Antonovich Yefremov (1907-1972), Russian geologist.
Help on Name Pronunciation: Name Pronunciation: Efremovite + Pronunciation Say EFREMOVITE

Efremovite Image

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image


Comments: White, massive efremovite. The mineral is hygroscopic and must be stored in a closed box.
Location: Ronneburg U deposit, Gera district, Thuringia, Germany. Scale: Picture size 6 mm.
© Thomas Witzke / Abraxas-Verlag

Efremovite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 9.99, Z = 4; V = 997.00 Den(Calc)= 2.48
Help on Crystal System: Crystal System: Isometric - Tetartoidal H-M Symbol (2 3) Space Group: P 213
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.15(1), 4.07(0.7), 2.668(0.5),

Physical Properties of Efremovite

Help on Cleavage: Cleavage: None
Help on Color: Color: Gray white, White.
Help on Diaphaneity: Diaphaneity: Subtranslucent to Opaque
Help on Hardness: Hardness: 2 - Gypsum
Help on Luster: Luster: Vitreous - Dull
Help on Streak: Streak: white

Optical Properties of Efremovite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= -0.41 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2218,KC= 0.1573
Ncalc = 1.39
Help on Optical Data: Optical Data: Isotropic, n=1.55.

Calculated Properties of Efremovite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.53 gm/cc
note: Specific Gravity of Efremovite =2.48 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.09
Boson Index = 0.91
Help on Photoelectric: Photoelectric: PEEfremovite = 1.85 barns/electron
U=PEEfremovite x rElectron Density= 4.68 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Efremovite is Not Radioactive

Efremovite Classification

Help on  Dana Class: Dana Class: (28)Anhydrous Acid and Sulfates
  (28.04)with miscellaneous formulae
  (28.04.04)Langbeinite Series Langbeinite K2Mg2(SO4)3 P 213 2 3 Manganolangbeinite K2Mn2(SO4)3 P 213 2 3 Efremovite (NH4)2Mg2(SO4)3 P 213 2 3
Help on  Strunz Class: Strunz Class: 07.AC.10 07 - SULFATES (SELENATES, TELLURATES)
  07.A - Sulfates (selenates, etc.) without Additional Anions, without H2O
  07.AC -With medium-sized and large cations
07.AC.10 Efremovite (NH4)2Mg2(SO4)3 P 213 2 3
07.AC.10 Manganolangbeinite K2Mn2(SO4)3 P 213 2 3
07.AC.10 Langbeinite K2Mg2(SO4)3 P 213 2 3

Other Efremovite Information

Help on References: References: PHYS. PROP.(Am.Min.,Vol.76,p299,1991) OPTIC PROP.(Am.Min.,Vol.76,p299,1991)
Help on See Also: See Also: Links to other databases for Efremovite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

Search for Efremovite using:

Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Efremovite :

Ask about Efremovite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espaņol

Print or Cut-and-Paste your Efremovite Specimen Label here :


Dana No: Strunz No: 07.AC.10





Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.