Global Gemology & Appraisals - Premier Jewelry Valuation Services
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ROCK CRYSTAL

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Temple St. Clair rock crystal amulet
Temple St. Clair rock crystal amulet
Variety:  Rock Crystal
Species:  Quartz
​​Mohs Hardness:  7 out of 10
Color:  Transparent and colorless with no phenomena
RI:  1.544 to 1.553 (very constant)
Birefringence:  0.009
SR/DR/AGG:  DR
Clarity Type:  Type II
Optic Character:  Uniaxial positive.  Might show a bull's eye or Airy's spiral optic figure and Brazil law twinning under crossed polarizing filters.
Spectrum:  Not diagnostic
Fluorescence:  Generally Inert
SG:  2.66 (+0.03/-0.02)
Routine Treatments:  None

Rock Crystal Facts

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​Rock crystal is the transparent, colorless variety of quartz.

Rock crystal is also referred to as clear quartz or colorless quartz.
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