Talc
| Refractive Index : 1.590 – 1.540 (+0.010 – 0.002) |
| Optical Characteristic : AGG |
| Specific Gravity : 2.75 (+0.05 – 0.55) |
| Formula : Mg3Si4O10(OH)2. |
| Crystal System : Monoclinic |
| Variety/Species : Talc |
| Species/Group : Steatite |
| Birefringence : 0.050 |
| Dispersion : N/A |
| Hardness : 1 to 2.5 |
| Toughness : good |
| Ultrasonic : risky |
| Steam : risky |
| UV Long : Inert to weak |
| UV Short : Inert to weak |
| Pleochroism : None |
| Strength : N/A |
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| Pleochroism Colors : None |
| Heat : Resists moderate heat |
| Acids : Resists attack by acids |
| Light : stable |
| Polish Luster : vitreous |
| Fracture : Uneven |
| Fracture Luster : Vitreous |
| Clarity Type : N/A |
| Tones : N/A |
| Saturations : N/A |
| Cause of Color : N/A |
| Enhancements : Dyeing |
| Cleavage : perfect 1 direction. |
| Color Range : White, green, brown, yellow, silvery white, whitish, greenish, brownish, reddish |
| Transparency : Semitranslucent to opaque |
| Phenomena : None |
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| Separations : Talc from- Alabaster : RI, SG, fluorescence (possibly) |
| Identifying Characteristics and information Very soft. Scratched by the fingernail. Greasy or soapy to the touch. Often with mottling or veining. |
| Spectral Data not diagnostic. |
| Trade Names and Misnomers Chinese turquoise (M)(3) Fukien jade (M) Honan jade (M) Kerolite Magnesium Talc Manchurian jade (M) Shanghai jade (M) Soapstone Soochow jade (M)(2) Steatite |
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