Mineralienatlas - Fossilienatlas
Chloritoid-2M |
Collectors Summary
Color | dunklegrün, grüngrau bis fast schwarz, selten farblos |
Streak color | grauweiß |
Lustre | Glasglanz, Perlmuttglanz |
Hardness (Mohs) | 6.5 |
Cleavages | vollkommen {001}, gut {110} |
Crystal System | monoklin, C2/c |
Morphology | Dünn bis dicke, blättrige Plättchen oder massive Aggregate. Selten sind pseudohexagonale Tafelkristalle. Zwillingsbildung gewöhnlich nach {001} |
Additional information / Summary
Es gibt 2 Polytypen von Chloritoid: monoklin: Chloritoid-2M, triklin: Chloritoid-1A. Die Daten hier beziehen sich auf den monoklinen Polytyp Chloritoid-2M |
Chemism
Chemical formula |
(Fe2+,Mg,Mn)2Al4Si2O10(OH)4 |
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Chemical composition |
Aluminium, Eisen, Magnesium, Mangan, Silicium, Sauerstoff, Wasserstoff |
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Analysis wt% |
SiO2 : 24.10, Al2O3 : 37.30, Fe2O3 : 7.60, FeO : 16.80, MgO : 5.90, H2O : 7.40 (Ref: Schweizerische Mineralogische und Petrographische
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Strunz 9th edition incl. updates |
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9: Silikate (Germanate) |
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Classification by Hölzel |
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9: SILICATES |
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IMA status |
anerkannt |
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Mineral status |
Polytype |
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Variety / polytype of |
Optical Properties
dunklegrün, grüngrau bis fast schwarz, selten farblos |
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grauweiß |
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durchscheinend |
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Glasglanz, Perlmuttglanz |
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max. Birefringence |
0.010 |
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Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness. |
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RI value α / ω / n |
1.722 |
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RI value β |
1.727 |
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RI value γ / ε |
1.732 |
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Ri mean |
1.727 |
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2V angle |
Biaxial (+) 36° – 70° |
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α grünlichgrau, olivgrün, farblos, grünlich-blau;
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Crystallography
Crystals 3D
Open larger view |
Physical Properties
6.5 |
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960 (ungefähre Angabe abgeleitet aus der Mohshärte) |
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3.5 (gemessen) 3.65 (berechnet) |
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3.47 ( ρ calc. Mineralienatlas ) |
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vollkommen {001}, gut {110} |
Preface
Author (Name, Year) |
Rose, 1837 |
References
Journal of Petrology 2 (1961), 49. American Mineralogist 65 (1980), 534. Neues Jahrbuch für Mineralogie, Monatshefte (1995), 385. Handbook of Mineralogy (Anthony u.w.), 2 (1995), 139. European Journal of Mineralogy 12 (2000), 293. Physics and Chemistry of Minerals 27 (2000), 703. http://www.staff.uni-mainz.de/tjohnson/Internal/KO-II.pdf |
Other languages
German |
Chloritoid-2M |
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English |
Chloritoid-2M |
Automatic Links to external internet sources (Responsibility is with the operator)
Mineral Dealer
IDs
GUSID (Global unique identifier short form) | 6cawQ29qc0O2Ew6fgp53NQ |
GUID (Global unique identifier) | 43B0C6E9-6A6F-4373-B613-0E9F829E7735 |
Database ID | 727 |