Smoky Quartz
| Refractive Index : 1.553 – 1.544 |
| Optical Characteristic : DR, U+, AGG |
| Specific Gravity : 2.651 (+0.04 – 0.01) |
| Formula : SiO2 |
| Crystal System : Trigonal |
| Variety/Species : smoky |
| Species/Group : Quartz |
| Birefringence : 0.009 |
| Dispersion : 0.013 |
| Hardness : 7 |
| Toughness : good |
| Ultrasonic : Usually safe |
| Steam : risky |
| UV Long : Inert |
| UV Short : Inert |
| Pleochroism : 2 colors |
| Strength : weak |
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| Pleochroism Colors : Dark stones, weak: Brown/reddish brown. Light stones, weak: light and darker yellowish brown. |
| Heat : Avoid heating |
| Acids : Avoid hydrofluoric acid |
| Light : stable |
| Polish Luster : vitreous |
| Fracture : conchoidal |
| Fracture Luster : Vitreous |
| Clarity Type : l |
| Tones : N/A |
| Saturations : N/A |
| Cause of Color : Aluminum impurities |
| Enhancements : lrradiation, heating |
| Cleavage : None |
| Color Range : Light to dark, brown, gray, black Brownish, grayish, blackish Black variety is also called morion. |
| Transparency : Transparent |
| Phenomena : None |
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| Separations : Smoky Quartz from- Beryl: RI, optic character, optic figure (possibly), SG (possibly) Topaz: RI, SG, optic character, cleavage Synthetic Quartz: magnification, twinning pattern (as visible under polarized light) |
| Identifying Characteristics and information Color zoning, 2 and 3 phase liquid inclusions negative crystals, sometimes bull’s eye or Airy’s spiral optic figure. Also known as Cairngorm. Incorrectly called smoky topaz. |
| Spectral Data not diagnostic. |
| Trade Names and Misnomers Brown Quartz Cairngorm(2) Colorado Diamond(M) Radium Diamond(M) Smoky citrine(M) Smoky Quartz Smoky Topaz(M) |
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