L81 calcite Obsidian is produced from felsic

Obsidian is produced from felsic lava

Petrifaction is the result of a tree or tree-like plants having been replaced by stone via a mineralization process that often includes permineralization and replacement

12" wide x 5" deep x 10" high

Size: 18" wide x 15" high x 4" deep

and bobeche are put together in a sculptural form - creating a piece that appears to have evolved together over time

L81 calcite Obsidian is produced from felsic18th century Japanese silk textile brocade with scrolling lotus and chrysanthemums framed with a print room border a popular form of decoration in England and Ireland from the 1750's to the 1820's. 13. 5" wide x 15" long