3.5" Pyrite Obelisk DV075 obsidian Opal is a hydrated amorphous

Opal is a hydrated amorphous form of silica

This lovely barite slab from Poland is polished on one side

Dimensions: 2 x 2 x 1

Walter Lopes is based in Lagoa Santa

as shown in the photos

3.5" Pyrite Obelisk DV075 obsidian Opal is a hydrated amorphousPyrite Obelisk Approx. Dimensions: 3. 5 x 1. 25 x 1. 5 inches Approx. Weight: 188 grams Locality: Peru Pyrite Often referred to as "Fool's Gold", pyrite, or iron pyrite, is composed of Iron Sulfide. Its name is derived from the Greek word "pyr", or "fire". Pyrite is enjoyed by many because of its lustrous gold sheen, but sometimes appears in a yellow gray or gray color. Sometimes oxidization of the pyrite will cause a brown or iridescent film to form