This is rough Window Rhyolite that comes out of Africa. It has a nice color and it takes a great polish!
Window rhyolite lapidary rough is distinguished by its intriguing patterns, which frequently mimic abstract art, picturesque vistas, or landscapes. The interaction of various minerals and components within the rhyolite produces these patterns, which produce an enthralling variety of colors, forms, and textures.
Window rhyolite appears as unevenly shaped fragments with a rough, unpolished surface when it is in its raw form. But beneath these coarse surfaces is the possibility of becoming beautiful jewels that highlight the natural beauty of the stone.
Expert lapidaries choose and polish the rough stone with care, removing extra material to expose the most striking colors and patterns within.