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MD-265776
Calcite
Cabinet, 13.7 x 9.7 x 6.4 cm
Irai, Alto Uruguai region, Rio Grande do Sul, South Region, Brazil
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Irai is well known for elongated scalenohedrons, perched inside amethyst pockets in some cases, or growing in isolated sprays on thin basalt shells from the lava tubes here. I have not, however, seen anything from here like this before. It is a spray of sharp, almost acicular calcites poking out like hedgehogs on the rock matrix. Each of the spherical clusters is complete-all-around, even the backside.