Corundum (Ruby) Arizona Formula: CuAl₆(PO₄)₄(OH)₈ • 4H₂O urquoise

Formula: CuAl₆(PO₄)₄(OH)₈ • 4H₂O urquoise is an opaque

If they are held up to the light

It is a type of fossilized ammonite shell that is primarily comprised of aragonite which is the same mineral contained in Mother of Pearl

Cu2CO3(OH)2

most commonly found in deposits from China and South Africa

Corundum (Ruby) Arizona Formula: CuAl₆(PO₄)₄(OH)₈ • 4H₂O urquoiseThis 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