Rutilated quartz is a rare mineral that is mainly made up of titanium dioxide. One of its most outstanding physical properties is that is has a remarkably high refractive index which makes it to disperse plenty of light, more than any other mineral known to mankind.
An excellent Dioptase specimen from the Tsumeb Mine. Crystal Classics Minerals
Fluorite in Barite
Rare paragenesis Rhodochrosite with amethyst
Beautiful Minerals — gorgeousgeology: Barite is a mineral...
Calcite on Aurichalcite | Mexico / Mineral Friends <3