Gerstmannite Mineral Data + 
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- 52.2.1.1 Euclase BeAlSiO4(OH) P 21/a 2/m
- 52.2.1.2 Clinohedrite CaZnSiO4·(H2O) Aa m
- 52.2.1.3. Hodgkinsonite MnZn2SiO4(OH)2 P 21/c 2/m
- 52.2.1.4 Gerstmannite (Mg,Mn)2ZnSiO4(OH)2 Bbam 2/m 2/m 2/m
- VIII/B.03-03 Magnesiostaurolite! []4Mg4Al16(Al,[])2Si8O40[O6,(OH)2] C 2/m 2/m
- VIII/B.03-05 Zincostaurolite! []4Zn4Al16(Al,[])2Si8O40[O6,(OH)2] C 2/m 2/m
- VIII/B.03-10 Staurolite (Fe,Mg)2Al9(Si,Al)4O20(O,OH)4 C 2/m 2/m
- VIII/B.03-20 Gerstmannite (Mg,Mn)2ZnSiO4(OH)2 Bbam 2/m 2/m 2/m
General Gerstmannite Information |
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 Chemical Formula: |
(Mg,Mn)2ZnSiO4(OH)2 | ||
| 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 | |||
| Empirical Formula: |
Mg1.5Mn2+0.5Zn(SiO4)(OH)2 | ||
| IMA Status: |
Approved IMA 1977 | ||
| Locality: |
Link to MinDat.org Location Data. | ||
| Synonym: |
ICSD 100142 | ||
| PDF 29-867 | |||
Search for Gerstmannite Images | |||
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Images:
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Gerstmannite Crystallography |
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| Axial Ratios: |
a:b:c =0.4388:1:0.3351 | ||
| Cell Dimensions: |
a = 8.185, b = 18.65, c = 6.25, Z = 8; V = 954.06 Den(Calc)= 3.56 | ||
| Crystal System: |
Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Bbam | ||
| X Ray Diffraction: |
By Intensity(I/Io): 2.598(1), 9.326(0.85), 3.418(0.8), | ||
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Crystal Structure:
Mouse |
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Physical Properties of Gerstmannite |
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| Cleavage: |
[010] Good | ||
| Color: |
White, Light pink. | ||
| Density: |
3.68 | ||
| Diaphaniety: |
Translucent to Opaque | ||
| Hardness: |
4.5 - Between Fluorite and Apatite | ||
| Luster: |
Vitreous - Adamantine | ||
| Streak: |
white | ||
Optical Properties of Gerstmannite |
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| 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 |
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| 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 |
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| Electron Density: |
relectron=3.47 gm/cc |
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| Fermion Index |
Fermion Index = 0.03008 Boson Index = 0.96992 |
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| Photoelectric: |
PEGerstmannite = 16.05 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Gerstmannite is Not Radioactive |
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Gerstmannite Classification |
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| Dana Class: |
52.2.1.4 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O | ||
| (52.2)with cations in [4] and >[4] coordination | |||
| (52.2.1)Euclase group | |||
| Strunz Class: |
VIII/B.03-20 VIII - Silicates | ||
| VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, cations of octahedral and tetrahedral orientation [4/6] | |||
| VIII/B.03 - Staurolite - Gerstmannite series | |||
Other Gerstmannite Information |
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| References: |
PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) | ||
| See Also: |
Links to other databases for Gerstmannite : 1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 - Franklin Minerals(Dunn) 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 - WWW-MINCRYST 15 -École des Mines de Paris Search for Gerstmannite using: Visit our Advertisers for Gerstmannite : Translate Gerstmannite Mineral Data : Ask about Gerstmannite here : Print or Cut-and-Paste your Gerstmannite Specimen Label here :
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