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General Grunerite Information |
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 Chemical Formula: |
[ ]Fe++7Si8O22(OH)2 | ||
| Composition: |
Molecular Weight = 1,001.61 gm | ||
| Iron 39.03 % Fe 50.21 % FeO | |||
| Silicon 22.43 % Si 47.99 % SiO2 | |||
| Hydrogen 0.20 % H 1.80 % H2O | |||
| Oxygen 38.34 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Empirical Formula: |
Fe2+7(Si8O22)(OH)2 | ||
| IMA Status: |
Valid Species (Pre-IMA) 1853 | ||
| Locality: |
Link to MinDat.org Location Data. | ||
| Name Origin: |
Named for Louis Emmanuel Gruner (1809-1883), Swiss-French chemist who analyzed the mineral. | ||
| Name Pronunciation: |
Grunerite + Pronunciation  |
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| Synonym: |
Amosite | ||
| ICSD 24590 | |||
| PDF 44-1401 | |||
Grunerite Image | |||
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Images:
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Grunerite Crystallography |
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| Axial Ratios: |
a:b:c =0.5252:1:0.2925 | ||
| Cell Dimensions: |
a = 9.57, b = 18.22, c = 5.33, Z = 2; beta = 102.1° V = 908.72 Den(Calc)= 3.66 | ||
| Crystal System: |
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m | ||
| X Ray Diffraction: |
By Intensity(I/Io): 8.33(1), 2.77(0.9), 3.07(0.8), | ||
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Crystal Structure:
Mouse |
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Physical Properties of Grunerite |
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| Cleavage: |
{110} Perfect, {???} Distinct | ||
| Color: |
Ashen, Brown, Brownish green, Dark gray. | ||
| Density: |
3.4 - 3.5, Average = 3.45 | ||
| Diaphaneity: |
Translucent to opaque | ||
| Fracture: |
Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces. | ||
| Habit: |
Columnar - Forms columns | ||
| Habit: |
Fibrous - Crystals made up of fibers. | ||
| Habit: |
Massive - Uniformly indistinguishable crystals forming large masses. | ||
| Hardness: |
5-6 - Between Apatite and Orthoclase | ||
| Luminescence: |
Non-fluorescent. | ||
| Luster: |
Vitreous - Pearly | ||
| Streak: |
colorless | ||
Optical Properties of Grunerite |
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| Gladstone-Dale: |
CI meas= -0.004 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.054 (Good) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.1896,KPDmeas= 0.2011,KC= 0.2003 Ncalc = 1.68 - 1.73 |
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| Optical Data: |
Biaxial (-), a=1.663-1.686, b=1.68-1.709, g=1.696-1.729, bire=0.0330-0.0430, 2V(Calc)=84-86, 2V(Meas)=90-70. Dispersion r > v. | ||
| Pleochroism (x): |
colorless, colorless, or pale yellow. | ||
| Pleochroism (y): |
colorless, pale yellow, or yellowish gray. | ||
| Pleochroism (z): |
colorless, pale green, pale yellow, or pale greenish yellow. | ||
Calculated Properties of Grunerite |
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| Electron Density: |
Bulk Density (Electron Density)=3.36 gm/cc note: Specific Gravity of Grunerite =3.45 gm/cc. |
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| Fermion Index: |
Fermion Index = 0.01 Boson Index = 0.99 |
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| Photoelectric: |
PEGrunerite = 12.52 barns/electron U=PEGrunerite x rElectron Density= 42.08 barns/cc. |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Grunerite is Not Radioactive |
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Grunerite Classification |
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| Dana Class: |
66.01.01.03 (66)Inosilicate Double-Width Unbranched Chains, W=2 | ||
| (66.01)with P=2 amphibole configuration | |||
| (66.01.01)Group 1, the Mg-Fe-Mn-Li amphiboles (Monoclinic) | |||
| Strunz Class: |
09.DE.05 09 - SILICATES (Germanates) | ||
| 09.D - Inosilicates* Structural terminology according to Liebau (1985) | |||
| 09.DE -Inosilicates with 2-periodic double chains, Si4O11; amphibole family | |||
Other Grunerite Information |
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| References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65) | ||
| See Also: |
Links to other databases for Grunerite : 1 - Am. Min. Crystal Structure Database 2 - Athena 3 - CalTech Mineral Spectroscopy 4 - EUROmin Project 5 - Ecole des Mines de Paris 6 - GeoScienceWorld 7 - Google Images 8 - Google Scholar 9 - Handbook of Mineralogy (MinSocAm) 10 - Handbook of Mineralogy (UofA) 11 - HyperPhysics 12 - MinDAT 13 - Mineralienatlas (Deutsch) 14 - Online Mineral Museum 15 - QUT Mineral Atlas 16 - Ruff.Info 17 - WWW-MINCRYST Search for Grunerite using: Visit our Advertisers for Grunerite : A Bijoux Google Search for GruneriteAdam's Minerals Google Search for Grunerite Cape Minerals Google Search for Grunerite Dakota Matrix Minerals Google Search for Grunerite Excalibur Mineral Corp. Google Search for Grunerite Exceptional Minerals Google Search for Grunerite John Betts Fine Minerals Search for Grunerite McDougall Minerals Google Search for Grunerite Mineral News Website Link Rock and Mineral Shows Google Search for Grunerite Weinrich Minerals, Inc. Google Search for Grunerite Ask about Grunerite here : Print or Cut-and-Paste your Grunerite Specimen Label here :
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