A View of The Quartzsite Gem Shows
The Quartzsite gem shows attract gemologists and rock hounds from around the world. Learn what to expect and how to shop at these huge annual January…
The International Gem Society (IGS) has a list of businesses offering gemstone appraisal services.
|Smoky Quartz||All sizes|
|Rose Quartz||All sizes|
|Rutilated & Tourmalinated Quartz||All sizes|
|Quartz with Lepidocrite||All sizes|
|Faceted or cabochon||to /ct|
|Star Quartz||All sizes|
|Is a Variety of||Quartz|
|Colors||Every shade of brown.|
|Fracture||Conchoidal to uneven|
|Cleavage||None or indistinct|
|Typical Treatments||Heat Treatment|
|Transparency||Transparent to opaque.|
|Absorption Spectrum||Not diagnostic.|
Dark stones: weak brown/reddish brown. Light stones: weak, light and darker yellowish brown.
o = 1.544; e = 1.553 (very constant). Uniaxial (+).
|Optic Sign||Uniaxial +|
Smoky quartz is also mistaken for topaz. It comes in every shade of brown, from a light tan to nearly black. “Chocolate citrine” is a pleasant brownish/yellow color. Smoky quartz is known for its large sizes. The person who wants a really big gem, without a really big budget, often ends up with one of these.
Smoky quartz: is in the same size league as citrine, but larger stones get very dark and opaque. Smithsonian Institution (Washington, D.C): 4500 (California) and 1695 (Brazil), plus others.