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Weddelite
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Type Calcium oxalate
Essential mineral(s) {{{Essential mineral(s)}}}
Accessory mineral(s) {{{Accessory mineral(s)}}}

Weddellite is a mineral mainly made of calcium oxalate that can be yellowish brown and transparent in color. This rock is tetragonal, and it can actually be formed by certain animals in the ocean (under certain circumstances, of course).