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The feldspar has a step-like surface with interesting lattice with the rare purple apatite is about halfway up the specimen
Geologically
Opalite shares the same basic chemical properties as Opal and is rated between 5
Each coaster features a polished agate slice in a range of stunning colors including pink
meditation
Iridescent Marcasite Size:Small 3.75"x2" The feldspar has a step-likeThe mineral marcasite, sometimes called white iron pyrite, is iron sulfide (FeS2) with orthorhombic crystal structure. This specimen of marcasite has an amazing iridescent tarnish in colors of purple, green, bright blue, golds and reds. The metallic marcasite is complimented beautifully by gemmy illustrious clear to orangish calcite crystals which cover the specimen 360 degrees around. Small brightly colored brassy yellow crystals of chalcopyrite also
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