Quartz
A piece of rock crystal or colorless quartz cut into a wedge shape can help a gemologist conduct optic sign tests with a polariscope. "Quartz - Rock Crystal" by Lucky Lynda is licensed under CC By 2.0
Article: How To Make A Quartz Wedge For Polariscope Testing
Credit: Lucky Lynda
Gemstone | Quartz |
Natural or man made | Natural |
Gem State | Rough |
Color | White |
Transparency | Translucent |