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Gemstones, Minerals & Fossils
Gemstones and Minerals
Faceting Spinel (Blackjack)
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<blockquote data-quote="Wally69" data-source="post: 451733" data-attributes="member: 1916"><p>Decided to see what would happen if I went straight to a large surface polish on stone No.2, I would not normally do this in fear of tearing an edge.</p><p></p><p>The stone behaved similar to some sapphire surfaces and developed orange peel like pits under the 1000 disc, but they are very even and small unlike some sections of a sapphire facet that will just run away on you. The edges seem to be rock-solid.</p><p></p><p><img src="https://www.prospectingaustralia.com/forum/img/member-images/1916/1542086385_791a6072-36c4-4c4e-accd-cd1dffbe35dd.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>The polish stage was interesting and is very slow due to the hardness of spinel and my choice to do a large table. Running several grit size graduations might be a smarter choice to get the pitting out of the stone quicker. Smaller facets would also help.</p><p></p><p><img src="https://www.prospectingaustralia.com/forum/img/member-images/1916/1542086687_a723e133-9bd4-47f2-af03-33e387b1bea1.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>This photo shows the inclusions and fine pitting that looks like it will come out. The reflection is the globe of my work lamp.</p></blockquote><p></p>
[QUOTE="Wally69, post: 451733, member: 1916"] Decided to see what would happen if I went straight to a large surface polish on stone No.2, I would not normally do this in fear of tearing an edge. The stone behaved similar to some sapphire surfaces and developed orange peel like pits under the 1000 disc, but they are very even and small unlike some sections of a sapphire facet that will just run away on you. The edges seem to be rock-solid. [img]https://www.prospectingaustralia.com/forum/img/member-images/1916/1542086385_791a6072-36c4-4c4e-accd-cd1dffbe35dd.jpg[/img] The polish stage was interesting and is very slow due to the hardness of spinel and my choice to do a large table. Running several grit size graduations might be a smarter choice to get the pitting out of the stone quicker. Smaller facets would also help. [img]https://www.prospectingaustralia.com/forum/img/member-images/1916/1542086687_a723e133-9bd4-47f2-af03-33e387b1bea1.jpg[/img] This photo shows the inclusions and fine pitting that looks like it will come out. The reflection is the globe of my work lamp. [/QUOTE]
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Gemstones, Minerals & Fossils
Gemstones and Minerals
Faceting Spinel (Blackjack)
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