fuckyeahmineralogy: A naturally rhombic specimen of calcite (CaCO3). Well-formed calcite like this i
fuckyeahmineralogy: A naturally rhombic specimen of calcite (CaCO3). Well-formed calcite like this is often referred to as optical calcite; being rhombic instead of a perfect cube, the calcite can cause an image directly underneath it to appear twice. -- source link
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