Global Gemology - Rare Gems & Jewels
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ROCK CRYSTAL

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Unusual rock crystal bead necklace featuring 3 carved rock crystal alien bead stations with gold leaf eyes
Unusual rock crystal necklace
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.
  • HOME
  • ABOUT
  • SHOP
  • SERVICES
    • APPRAISALS
    • EXPERT WITNESS TESTIMONY
    • SELL YOUR JEWELRY
  • GEMOLOGY
    • GEM ENCYCLOPEDIA
    • THE ART OF GEMOLOGY
  • JEWELRY EDUCATION
    • DIAMOND FACTS
    • JEWELER DIRECTORY
    • JEWELRY PERIODS
    • POCKET WATCHES
    • NATIVE AMERICAN JEWELRY
  • GLOSSARY