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| තලාතු මිනිරං | |
|---|---|
 biotite: Topotype deposit (Image width: 2.5 mm) | |
| General | |
| Category | Dark series |
| K(Mg,Fe)3(AlSi3O10)(F,OH)2 | |
| Identification | |
| 433.53 g | |
| පාට / පැහැය | Dark brown, greenish-brown, blackish-brown, yellow, white |
| Massive to platy | |
| (2/m) Space Group: C 2/m | |
| Common on the [310], less common on the {001} | |
| Perfect on the {001} | |
| Micaceous | |
| Tenacity | Brittle to flexible, elastic |
| hardness | 2.5–3.0 |
| Vitreous to pearly | |
| White | |
| Transparent to translucent to opaque | |
| 2.7–3.1 | |
| 2.8–3.4 | |
| Optical properties | Biaxial (-) |
| nα = 1.565–1.625 nβ = 1.605–1.675 nγ = 1.605–1.675 | |
| δ = 0.03–0.07 | |
| Strong | |
| r < v (Fe rich); r > v weak (Mg rich) | |
| Ultraviolet | None |
| References | |
- Biotite mineral information and data Mindat
- Biotite Mineral Data Webmineral
- Handbook of Mineralogy
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තල ත ම න ර biotite Topotype deposit Image width 2 5 mm GeneralCategoryDark seriesK Mg Fe 3 AlSi3O10 F OH 2Identification433 53 gප ට ප හ යDark brown greenish brown blackish brown yellow whiteMassive to platy 2 m Space Group C 2 mCommon on the 310 less common on the 001 Perfect on the 001 MicaceousTenacityBrittle to flexible elastichardness2 5 3 0Vitreous to pearlyWhiteTransparent to translucent to opaque2 7 3 12 8 3 4Optical propertiesBiaxial na 1 565 1 625 nb 1 605 1 675 ng 1 605 1 675d 0 03 0 07Strongr lt v Fe rich r gt v weak Mg rich UltravioletNoneReferences Biotite mineral information and data Mindat Biotite Mineral Data Webmineral Handbook of Mineralogy