Black Obsidian 8x10-9x13mm Side Drilled Pebble - 15-16 Inch Seraphinite displaying these colors in patterns

displaying these colors in patterns of parallel bands

Botswana Agate was formed nearly 187 million years ago by lava flowing in waves from long faults in the earth

The crystal naturally forms with 18 facets

a cryptocrystalline Quartz

Tree Agate has dendritic inclusions of iron or manganese in green

Black Obsidian 8x10-9x13mm Side Drilled Pebble - 15-16 Inch Seraphinite displaying these colors in patternsEssentially a volcanic glass, Obsidian ranges in color from opaque black, to green, brown, mahogany, black with rainbow colors, black with snowflake patterns, black with a golden sheen, and translucent black (Apache Tears)