raw moldavite meteorite glass on white

moldavite tektite glass impactite stone mineral rock natural raw rough unpolished unworked gemstone sample specimen material piece texture surface geological mineralogical collection object macro closeup close isolated cutout cut white background geology gemology gemmology gemological bohemian mineralogy crystal crystalline translucent gem uncut green czech silica meteorite bohemia pseudochrysolite water chrysolite vltavin