Obsidian 8x10mm Triangle Cut Faceted Puff Oval - 15-16-Inch Stone Type_Spiny Oyster This material dates back 29

This material dates back 29 million years and has been used in early civilizations as tools similar to obsidian

Green Aventurine is a green translucent quartz with glimmering metallic inclusions

Sizes of rough cut specimens will vary in size

1-2 large ranging 20-30mm

blue-greens and greens swirled with yellow-green

Obsidian 8x10mm Triangle Cut Faceted Puff Oval - 15-16-Inch Stone Type_Spiny Oyster This material dates back 29Essentially 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)