FREE: Polished Obsidian Volcanic Glass, 1-5/8x1-1/16 Inch, Cabochon, Pendants, Rings, Jewelry

The listing, Polished Obsidian Volcanic Glass, 1-5/8x1-1/16 Inch, Cabochon, Pendants, Rings, Jewelry has ended.

this is a polished piece of obsidian, a type of volcanic glass. The white patterns on the surface suggest it is likely a variety known as snowflake obsidian. Obsidian is formed when felsic lava cools rapidly, without sufficient time for crystal growth. It is typically dark in color, often black, but can also be red or brown due to the presence of hematite (iron oxide). The white or gray patterns seen on snowflake obsidian are caused by the inclusion of small, white, radially clustered crystals of the mineral cristobalite.
Obsidian has a glassy luster and is slightly harder than window glass. Enlarge for details and ask any questions.