GEO-CHEMIST

Ethiopia - Opal Stone Ethiopia - Opal Stone Awesome Shining Stone  

Quartz & Matrix Types Stone   Specification Amethyst Formula: SiO2 Color: Purple Lustre: Vitreous Name: From Greek "a-methys...

Tourmaline var. Elbaite with Quartz and Lepidolite on Cleavelandite Pederneira Mine, Minas Gerais, Brazil : learn more: www.geologypa...

15  Amazing & Natural Stone Virgin Valley Opal   Bismuthinite Formula: Bi2S3 System: Orthorhombic ...