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Gemstones, Minerals & Fossils
Lapidary
Anyone know what rock this is
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<blockquote data-quote="Lefty" data-source="post: 343321" data-attributes="member: 2976"><p>Here's a star sapphire here Wishful, came from our old claim many years ago. This one has some cracks but I cabbed it anyway.</p><p></p><p><img src="https://c1.staticflickr.com/9/8650/16696311796_e227b571ae_c.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>I think I have some pics of rough star sapphires somewhere, can't find them right now. They can be translucent blue or green but most of the ones from the Anakie field are jet black. One feature that readily identifies them from black spinel is that they will show a bronze-gold sheen across the surface in certain directions. It is the area with this sheen that will show a star when cabbed so that area has to be properly oriented.</p><p></p><p>I have a couple of rough ones here at present. One is virtually the perfect shape, a rough natural oval with the c-axis where the sheen is in just the right spot - should cab a nice stone with very little waste. The other is much bigger - nearly as big as the end joint of my thumb - but is quite flat and the sheen is on the narrow edge. A pretty hopeless stone for showing a star. Best kept as a specimen.</p></blockquote><p></p>
[QUOTE="Lefty, post: 343321, member: 2976"] Here's a star sapphire here Wishful, came from our old claim many years ago. This one has some cracks but I cabbed it anyway. [img]https://c1.staticflickr.com/9/8650/16696311796_e227b571ae_c.jpg[/img] I think I have some pics of rough star sapphires somewhere, can't find them right now. They can be translucent blue or green but most of the ones from the Anakie field are jet black. One feature that readily identifies them from black spinel is that they will show a bronze-gold sheen across the surface in certain directions. It is the area with this sheen that will show a star when cabbed so that area has to be properly oriented. I have a couple of rough ones here at present. One is virtually the perfect shape, a rough natural oval with the c-axis where the sheen is in just the right spot - should cab a nice stone with very little waste. The other is much bigger - nearly as big as the end joint of my thumb - but is quite flat and the sheen is on the narrow edge. A pretty hopeless stone for showing a star. Best kept as a specimen. [/QUOTE]
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Gemstones, Minerals & Fossils
Lapidary
Anyone know what rock this is
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