(Source: theverge.com, via luxulterior)
Moldavite under a microscope
Fluorite with sectoral zoning; Okaruso Mine, Namibia
(via Treasure Mountain Mining articles)
Apatite (Ca5(PO4)3(F,Cl,OH)) is the major component of bones and teeth. Rare earth elements can be found in it when it is a non-biological product.