Cabinet, 13.7 x 9.7 x 6.4 cm
Irai, Alto Uruguai region, Rio Grande do Sul, South Region, Brazil
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.