Other
Zircon
- Course
- Institution
This photo is of a gemstone called Zircon. a) Refraction: Double b) Difference between High & Low Index: 0.53 c) Specific Gravity: Lighter - 4.20 Heavier - 4.69 d) Hardness: 7.5 Source: A Text-book of Precious Stones for Jewelers and the Gem-loving Public by Frank Bertram Wade
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