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Anthophyllite Mineral Data |
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Anthophyllite Mineral Data |
General Anthophyllite Information |
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 Chemical Formula: |
[ ]Mg7Si8O22(OH)2 | ||
| Composition: |
Molecular Weight = 780.82 gm | ||
| Magnesium 21.79 % Mg 36.13 % MgO | |||
| Silicon 28.78 % Si 61.56 % SiO2 | |||
| Hydrogen 0.26 % H 2.31 % H2O | |||
| Oxygen 49.18 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Empirical Formula: |
Mg7(Si8O22)(OH)2 | ||
| Environment: |
Metamorphic rocks. | ||
| IMA Status: |
Valid Species (Pre-IMA) 1861 | ||
| Locality: |
Bodenmais, Germany. Montana, USA. Link to MinDat.org Location Data. | ||
| Name Origin: |
From the Latin anthophyllum - "clove" in allusion to the color. | ||
| Name Pronunciation: |
Anthophyllite + Pronunciation  |
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| Synonym: |
ICSD 40294 | ||
| PDF 42-544 | |||
Anthophyllite Image | |||
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Anthophyllite Crystallography |
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| Axial Ratios: |
a:b:c =1.0292:1:0.2929 | ||
| Cell Dimensions: |
a = 18.554, b = 18.026, c = 5.28, Z = 5; V = 1,765.92 Den(Calc)= 3.67 | ||
| Crystal System: |
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma | ||
| X Ray Diffraction: |
By Intensity(I/Io): 3.05(1), 3.24(0.6), 8.26(0.55), | ||
Physical Properties of Anthophyllite |
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| Cleavage: |
{110} Perfect, {???} Distinct, {???} Distinct | ||
| Color: |
White, Greenish gray, Green, Clove brown, Brownish green. | ||
| Density: |
2.85 - 3.57, Average = 3.21 | ||
| Diaphaneity: |
Transparent to translucent | ||
| Fracture: |
Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz). | ||
| Habit: |
Fibrous - Crystals made up of fibers. | ||
| Habit: |
Lamellar - Thin laminae producing a lamellar structure. | ||
| Habit: |
Massive - Uniformly indistinguishable crystals forming large masses. | ||
| Hardness: |
5-6 - Between Apatite and Orthoclase | ||
| Luminescence: |
Fluorescent, Short UV=red, Long UV=red. | ||
| Luster: |
Vitreous - Pearly | ||
| Streak: |
gray | ||
Optical Properties of Anthophyllite |
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| Gladstone-Dale: |
CI meas= 0.034 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= 0.155 (Poor) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.1759,KPDmeas= 0.2011,KC= 0.2082 Ncalc = 1.59 - 1.76 |
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| Optical Data: |
Biaxial (+), a=1.598-1.674, b=1.605-1.685, g=1.615-1.697, bire=0.0170-0.0230, 2V(Calc)=82-90, 2V(Meas)=57-90. Dispersion r > v or r < v. | ||
| Pleochroism (x): |
pale green, pale tan brown, clove brown, or greenish yellow. | ||
| Pleochroism (y): |
brownish green, pale tan brown, clove brown, or greenish yellow. | ||
Calculated Properties of Anthophyllite |
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| Electron Density: |
Bulk Density (Electron Density)=3.21 gm/cc note: Specific Gravity of Anthophyllite =3.21 gm/cc. |
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| Fermion Index: |
Fermion Index = 0.03 Boson Index = 0.97 |
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| Photoelectric: |
PEAnthophyllite = 1.59 barns/electron U=PEAnthophyllite x rElectron Density= 5.11 barns/cc. |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Anthophyllite is Not Radioactive |
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Anthophyllite Classification |
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| Dana Class: |
66.01.02.02 (66)Inosilicate Double-Width Unbranched Chains, W=2 | ||
| (66.01)with P=2 amphibole configuration | |||
| (66.01.02)Dana Group | |||
| 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 Anthophyllite Information |
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| See Also: |
Links to other databases for Anthophyllite : 1 - Am. Min. Crystal Structure Database 2 - Amethyst Galleries' Mineral Gallery 3 - Athena 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 - MinDAT 12 - Mineralienatlas (Deutsch) 13 - Online Mineral Museum 14 - QUT Mineral Atlas 15 - Ruff.Info 16 - Scandinavian mineral gallery 17 - University of Colorado - Mineral Structure Data 18 - WWW-MINCRYST Search for Anthophyllite using: Visit our Advertisers for Anthophyllite : Ask about Anthophyllite here : Print or Cut-and-Paste your Anthophyllite Specimen Label here :
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