Moonstone 1700 cts rough gemstones cab lapidary C284

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Moonstone 1700 ct rough gemstones cab specimen or semi facet ___________________________ THE GEMSTONES IN THIS AD ARE not stock photos thay are of the gemstones you will receive. ALL GEMSTONES AND ROUGH ARE GENUINE NATURAL GEMSTONES lighting used was standerd 100 watt light bulb. good for cabbing or facet also wire wrap of rough crystals Genuine Gemstones Genuine natural gemstone-not man made _________________________________________________________________ Moh's hardness: 6-6.5 Refractive index: 1.52-1.568 Critical angle: 41° Specific gravity: 2.5-2.7 Cleavage: Perfect in 3 directions. Fracture: Uneven, somewhat brittle. Dispersion: Low (.012), but the combination of a high polish and minute inclusions can simulate the effect of moderate dispersion. Heat sensitivity: Low Pleochroism: None Birefringence (double refraction): Weak to medium (.005-.01) Crystal structure: Triclinic (bytownite, labradorite and sunstone) Monoclinic (orthoclase). Cutting: Cleavage usually doesn't present a problem. Sharp corners have the tendency to chip out when cutting. Polishing: Cerium oxide on most common laps. Comments: If cutting an Oregon sunstone with a pocket of color, put the colored area at the culet of the stone. This will impart the color to the rest of the stone. If t is strong shiller, then it will be better to cut read more

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