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Gemstones, Minerals & Fossils
Lapidary
Another experimental cab - black spinel
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<blockquote data-quote="Lefty" data-source="post: 112497" data-attributes="member: 2976"><p>As suggested to me in the garnet cab thread, a higher pre-polish allows tin oxide to put a mirror finish on the stuff. This bit also contained a surprise that's not visible in this photo - a star.</p><p></p><p><img src="https://farm4.staticflickr.com/3952/15069960344_a36fa587ba_c.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>It's not strong and it only displays two rays when rotated in sunlight. Seems to have another two but very underdeveloped. Pretty sure I know the difference between black spinel and a sapphire so I checked up on it - yes, spinel can display asterism and the star is often four-pointed. I quite like the stuff, i think it should probably be used more often.</p></blockquote><p></p>
[QUOTE="Lefty, post: 112497, member: 2976"] As suggested to me in the garnet cab thread, a higher pre-polish allows tin oxide to put a mirror finish on the stuff. This bit also contained a surprise that's not visible in this photo - a star. [img]https://farm4.staticflickr.com/3952/15069960344_a36fa587ba_c.jpg[/img] It's not strong and it only displays two rays when rotated in sunlight. Seems to have another two but very underdeveloped. Pretty sure I know the difference between black spinel and a sapphire so I checked up on it - yes, spinel can display asterism and the star is often four-pointed. I quite like the stuff, i think it should probably be used more often. [/QUOTE]
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Gemstones, Minerals & Fossils
Lapidary
Another experimental cab - black spinel
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