|The Very Highest Quality Gemstone Information. . .|
Worth A Fortune?
Originally the crystal balls used by clairvoyants were made of rock crystal, but nowadays are usually made of glass.
Rock crystal is often carved into quite large ornaments, ancient and antique examples may be quite valuable.
Rock crystal has been used for jewellery, often as as imitation for diamond, and is still cut and polished into beads.
The hardness of rock crystal is 7, and appears on the Moh scale as quartz.
|Chemical Composition and Name||SiO2 - Silicon Dioxide|
|Refractive Index||1.544 - 1.553|
|Specific Gravity||2.65 - 2.66|
|Crystalline System||Trigonal (Rhombohedral)|
|Other Optical Properties||Uniaxial|
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