Talc
Appearance
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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Àwọn 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