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their matrix is very smooth
is a variety of quartz that contains inclusions of hematite
The metal cools and takes the form of the trilobites
The inclusions are easy to see from multiple angles
Dioptase - Mineral Specimen unisex fleece sweater their matrix is very smoothMined from: Renville Mine, Pool Department, Republic of the Congo Description: This dioptase specimen from the Renville Mine shows a classic botryoidal copper rich matrix coated with dense clusters of deep green crystals lining a natural cavity. The outer surface has that velvety, granular look typical of oxidized copper minerals, while the interior opens into a pocket of well formed, glassy dioptase crystals. The contrast between the rough exterior
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