Talc
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| Talc | |
|---|---|
 Crystals of talc. | |
| General | |
| Category | Silicate mineral |
| Chemical formula | Mg3Si4O10(OH)2 |
| Identification | |
| Color | white, grey, green, blue, or silver |
| Crystal habit | foliated to fibrous masses |
| Crystal system | Monoclinic or Triclinic[1] |
| Cleavage | perfect basal cleavage |
| Fracture | Flat surfaces (not cleavage) fracture in an uneven pattern |
| Tenacity | Sectile |
| Mohs scale hardness | 1 |
| Luster | waxlike or pearly sometimes smooth |
| Streak | White |
| Diaphaneity | Translucent |
| Specific gravity | 2.58 to 2.83 |
| Optical properties | Biaxial (-) |
| Refractive index | nα = 1.538 - 1.550 nβ = 1.589 - 1.594 nγ = 1.589 - 1.600 |
| Birefringence | δ = 0.051 |
| Pleochroism | Weak in dark varieties |
| Other characteristics | Fluorescent |
| References | [2][3][4] |
Talc
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Itokasi[àtúnṣe | àtúnṣe àmìọ̀rọ̀]
- ↑ An Introduction to the Rock-Forming Minerals, second edition, by W.A. Deer, R.A. Howie, and J. Zussman, 1992, Prentice Hall, ISBN 0-582-30094-0.
- ↑ http://rruff.geo.arizona.edu/doclib/hom/talc.pdf Handbook of Mineralogy
- ↑ http://www.mindat.org/min-3875.html Mindat.org
- ↑ http://webmineral.com/data/Talc.shtml Webmineral data