Corundum (Ruby) Mica and rarely blue

and rarely blue

they are transparent and nearly colorless

brittle mineral composed of lead

azurite has a deep blue color and can pseudomorph to malachite

Corundum (Ruby) Mica and rarely blueThis specimen is a red variety of corundum (AlO), colored by trace amounts of chromium that produce its distinctive ruby tone and vivid red fluorescence under ultraviolet light. While gem quality ruby represents the transparent form of this mineral, this piece showcases the same composition and glowing energy in a natural crystalline state. Corundum ranks 9 on the Mohs hardness scale and is found in metamorphic and igneous environments worldwide. This