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Gemstones, Minerals & Fossils
Lapidary
Stones I have cut
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<blockquote data-quote="Lefty" data-source="post: 414066" data-attributes="member: 2976"><p>I usually polish with cerium at low speeds, not the least because it's mixed with water and doesn't stick to the lap like diamond in a greasy base so can get very quickly flung off at high speeds.</p><p></p><p>It the perspex lap scored? It shouldn't squeak much if it's both well-scored and wet enough.</p><p></p><p>What lap did you use to cut the facets in with?</p><p></p><p>Quartz can be twinned. A geologist tells me that technically, most quartz is not twinned but he agrees that perhaps a disproportionate percentage of facetable quartz crystal material may be. I've noticed this sometimes, with the polished surface having what looks like overlapping plates, not usually visible to the naked eye but can be annoying.</p></blockquote><p></p>
[QUOTE="Lefty, post: 414066, member: 2976"] I usually polish with cerium at low speeds, not the least because it's mixed with water and doesn't stick to the lap like diamond in a greasy base so can get very quickly flung off at high speeds. It the perspex lap scored? It shouldn't squeak much if it's both well-scored and wet enough. What lap did you use to cut the facets in with? Quartz can be twinned. A geologist tells me that technically, most quartz is not twinned but he agrees that perhaps a disproportionate percentage of facetable quartz crystal material may be. I've noticed this sometimes, with the polished surface having what looks like overlapping plates, not usually visible to the naked eye but can be annoying. [/QUOTE]
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Gemstones, Minerals & Fossils
Lapidary
Stones I have cut
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