Documents Smoky Quartz brownish-yellow glassy crystal point hardenss = 7 Moonstone white, grey, orange...

Slide 1Smoky Quartz brownish-yellow glassy crystal point hardenss = 7 Moonstone white, grey, orange dull/pearly box-like faces hardness = 5 Apache Tear black obsidian dull…

Engineering Corundum

1. Corundum 2. • Corundum is a crystalline form of aluminum oxide (Al2O3) with traces of iron, titanium and chromium. • It is one of the naturally clear transparent materials,…