Mineralogy Database

Gerstmannite Mineral Data

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General Gerstmannite Information

Help on Chemical  Formula: Chemical Formula: (Mg,Mn)2ZnSiO4(OH)2
Help on Composition: Composition: Molecular Weight = 255.41 gm
   Magnesium  14.27 %  Mg   23.67 % MgO
   Manganese  10.75 %  Mn   13.89 % MnO
   Zinc       25.60 %  Zn   31.87 % ZnO
   Silicon    11.00 %  Si   23.52 % SiO2
   Hydrogen    0.79 %  H     7.05 % H2O
   Oxygen     37.58 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg1.5Mn2+0.5Zn(SiO4)(OH)2
Help on Environment: Environment: In a hydrothermal vein cutting franklinite-willemite ore in a metamorphosed stratiform zinc orebody.
Help on IMA Status: IMA Status: Approved IMA 1977
Help on Locality: Locality: Sterling Hill, Ogdensburg, Sussex Co., New Jersey, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Ewald Gerstmann (1918- ), mineral collector of Franklin, New Jersey, USA.
Help on Name Pronunciation: Name Pronunciation: Gerstmannite + Pronunciation Say GERSTMANNITE
Help on Synonym: Synonym: ICSD 100142
  PDF 29-867

Gerstmannite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.4388:1:0.3351
Help on Cell Dimensions: Cell Dimensions: a = 8.185, b = 18.65, c = 6.25, Z = 8; V = 954.06 Den(Calc)= 3.56
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Bbam
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.598(1), 9.326(0.85), 3.418(0.8),

Physical Properties of Gerstmannite

Help on Cleavage: Cleavage: {010} Good
Help on Color: Color: White, Light pink.
Help on Density: Density: 3.68
Help on Diaphaneity: Diaphaneity: Translucent to Opaque
Help on Hardness: Hardness: 4.5 - Between Fluorite and Apatite
Help on Luster: Luster: Vitreous - Adamantine
Help on Streak: Streak: white

Optical Properties of Gerstmannite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.089 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.059 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1863,KPDmeas= 0.1803,KC= 0.198
Ncalc = 1.7 - 1.73
Help on Optical Data: Optical Data: Biaxial (-), a=1.655, b=1.657, g=1.678, bire=0.0230, 2V(Calc)=36, 2V(Meas)=50-60.

Calculated Properties of Gerstmannite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.47 gm/cc
note: Specific Gravity of Gerstmannite =3.56 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEGerstmannite = 16.05 barns/electron
U=PEGerstmannite x rElectron Density= 55.70 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Gerstmannite is Not Radioactive

Gerstmannite Classification

Help on  Dana Class: Dana Class: (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O
  (52.02)with cations in [4] and >[4] coordination
  (52.02.01)Euclase group Euclase BeAlSiO4(OH) P 21/a 2/m Clinohedrite CaZnSiO4•(H2O) Aa m Hodgkinsonite MnZn2SiO4(OH)2 P 21/c 2/m Gerstmannite (Mg,Mn)2ZnSiO4(OH)2 Bbam 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.AE.25 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AE -Nesosilicates with additional (O,OH,F,H2O);
09.AE.25 Gerstmannite (Mg,Mn)2ZnSiO4(OH)2 Bbam 2/m 2/m 2/m

Other Gerstmannite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Gerstmannite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info

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Dana No: Strunz No: 09.AE.25





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