kdirksak

 Geology

Fire obsidian reflection (GeolSci)

Fire obsidian closeup (GeolSci)

Fire Obsidian (GeolSci)

Oregon Sunstone (GeolSci)

Oregon Sun Stone bicolor (GeolSci)

Faceted Oregon Sunstone Padparadscha (GeolSci)

Faceted Oregon Sunstone (GeolSci)

Rock phone wallpaper

Sesame jasper (nouveaucollections.com)

Laguna Agate (Oakrocks.net)

Gemstone

Natural diamond

Ouro Verde Quartz (GeolSci)

Diamond Transistor (ABresnahan)

Green obsidian faceted

Green obsidian

Banded Iron Formation (Phys.Org)

Bismuth (LiveSci)

Bronzitite mineral under microscope