Rough Indigo Gabbro / 1-2" AVG - 1 KILO LOT Menu Tektites Obsidian is a kind of

Obsidian is a kind of glass that forms when volcanic lava rapidly cools in the open air without forming any specific crystalline structures

Avg Size Range: (65 to 75 millimeters)

This listing includes natural stones

and takes on a variety of colors depending on the other minerals and trace elements that are included as it forms and grows

Size Range Avg 1 inch

Rough Indigo Gabbro / 1-2" AVG - 1 KILO LOT Menu Tektites Obsidian is a kind ofQuantity: 1 kilogram Average size range: 1 to 2 inches Gabbro is a coarse igneous rock that cooled over long periods of time, as opposed to the related but much faster cooled basalt. Indigo gabbro is a special kind of gabbro that also contains a wide variety of other minerals like quartz and feldspar as inclusions, giving it a more distinctive mottled appearance.