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Gemstones, Minerals & Fossils
Lapidary
Stones I have cut
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<blockquote data-quote="Lefty" data-source="post: 414077" data-attributes="member: 2976"><p>You won't readily see twinning in the rough stone itself - it's microscopic layers with the crystal grain reversed with each one (if my understanding is correct). First layer has the crystal grain running one direction, next layer on top in the opposite direction, third one back in the original direction and so on. There's probably technical inconsitencies with that description but I have often seen the effects.</p><p></p><p>I still use plated #3000 laps from time to time - cheap and wear out quick but all the ones I've used have cut nice and flat and accurate nonetheless. </p><p></p><p>When sweeping the lap, I try to avoid the portion nearest the centre as the facet is getting close to finishing cutting. It seems to "rip" at the surface in a more aggressive manner than the outer portions - perhaps because the diamond particles are turning in a tighter arc relative to the the stone? Not sure but there's a real effect there.</p></blockquote><p></p>
[QUOTE="Lefty, post: 414077, member: 2976"] You won't readily see twinning in the rough stone itself - it's microscopic layers with the crystal grain reversed with each one (if my understanding is correct). First layer has the crystal grain running one direction, next layer on top in the opposite direction, third one back in the original direction and so on. There's probably technical inconsitencies with that description but I have often seen the effects. I still use plated #3000 laps from time to time - cheap and wear out quick but all the ones I've used have cut nice and flat and accurate nonetheless. When sweeping the lap, I try to avoid the portion nearest the centre as the facet is getting close to finishing cutting. It seems to "rip" at the surface in a more aggressive manner than the outer portions - perhaps because the diamond particles are turning in a tighter arc relative to the the stone? Not sure but there's a real effect there. [/QUOTE]
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Gemstones, Minerals & Fossils
Lapidary
Stones I have cut
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