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earthstory:
“ Etch star on ruby crystal.
Whether natural or synthetic, ruby crystals have shapes on their surface. These occur as pits or raised bumps, and are usually triangular or hexagonal. Their shape is influenced by the crystal structure of the...

earthstory:

Etch star on ruby crystal.

Whether natural or synthetic, ruby crystals have shapes on their surface. These occur as pits or raised bumps, and are usually triangular or hexagonal. Their shape is influenced by the crystal structure of the mineral, and they represent areas there the crystal was growing when the Earth ichor from which it crystallised ran out, or eaten away by magma or hydrothermal metamorphic fluids during its sejourn deep in the Earth.

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