Obsidian Square Tanzania

Tanzania

this mineral is a calcium carbonate mineral with inclusions of manganese and arsenic

It is estimated that this mineral is the fifth most abundant found on our planet and tenth most in the universe

Here are rutile crystals

Size: 3

Obsidian Square TanzaniaSize: 2. 0 in. Weight: 1. 2 oz Chemical Formula: SiO (Amorphous Volcanic Glass) Commonly found in Italy, Scotland, Mexico, Argentina, Greece, Iceland, Russia, New Zealand, Japan, and The United States. Obsidian is a naturally occurring form of volcanic glass. Obsidian forms as lava cools very rapidly and is not considered a mineral as its lacks any form of crystal structure. It is said that obsidian is actually a mistranslation from Pliny the Elder's