Black Obsidian Rough Rock can be used for making arrowheads and spear points.
Black Obsidian has a Moh's hardness of 5 - 5.5. Obsidian is formed when lava cools rapidly. Since the cooling is so quick, very few crystals form. Essentially, Obsidian is natural glass.
Price listed is per pound.
Larger pieces are currently not available. Sizes will vary from 1" to 3" pieces
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