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Gemstones, Minerals & Fossils
Lapidary
⭐ Show Us Your Cut Stones - Before And After Photos
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<blockquote data-quote="Dughug" data-source="post: 156580" data-attributes="member: 157"><p>Cristinite is essentially a glass made out of low grade chrysoprase by a company in Qld - Advanced Crystallisation Technology Pty Ltd. </p><p>RI is around 1.61, in an early article produced by the company they suggested that there is a slightly different RI for the different colours. </p><p></p><p>Cristinite was one of the stones that was required for the 2014 Gatton GEMBOREE. This helped get many cutters trying the material. Cristinite damages easily and is very susceptible to internal micro-shattering if you cut it on a coarse lap. This will lead to scratching and chipping when you come to polish.</p><p></p><p>My suggestion is to rough the material out on no less than a worn 600 then step upwards with your cutting laps removing a reasonable amount at each stage. This will help remove any sub-surface damage and help avoid many of the problems you will get olishing i.e. scratching & chipping.</p><p></p><p>It polishes on both diamond on alloy laps however my preference is cerium oxide on a composite lap. (You can use acrylic, old CD's or mylar film)</p><p></p><p>The material is cheap, takes a really brilliant polish and with lots of colour variants including bi-colour and colour change it's good to have a play with. Although nothing will beat what Mother Nature makes for us to find.</p></blockquote><p></p>
[QUOTE="Dughug, post: 156580, member: 157"] Cristinite is essentially a glass made out of low grade chrysoprase by a company in Qld - Advanced Crystallisation Technology Pty Ltd. RI is around 1.61, in an early article produced by the company they suggested that there is a slightly different RI for the different colours. Cristinite was one of the stones that was required for the 2014 Gatton GEMBOREE. This helped get many cutters trying the material. Cristinite damages easily and is very susceptible to internal micro-shattering if you cut it on a coarse lap. This will lead to scratching and chipping when you come to polish. My suggestion is to rough the material out on no less than a worn 600 then step upwards with your cutting laps removing a reasonable amount at each stage. This will help remove any sub-surface damage and help avoid many of the problems you will get olishing i.e. scratching & chipping. It polishes on both diamond on alloy laps however my preference is cerium oxide on a composite lap. (You can use acrylic, old CD's or mylar film) The material is cheap, takes a really brilliant polish and with lots of colour variants including bi-colour and colour change it's good to have a play with. Although nothing will beat what Mother Nature makes for us to find. [/QUOTE]
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Gemstones, Minerals & Fossils
Lapidary
⭐ Show Us Your Cut Stones - Before And After Photos
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