Obsidian Square You will receive the point

You will receive the point pictured

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

Here are rutile crystals

Tanzania

Obsidian Square You will receive the pointSize: 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