Machocany

Obsidian is a volcanic rock, a product of the effusion of lavas with a rhyolitic composition, that is, particularly rich in silica and alkali. Specific conditions of rapid cooling of lava on the earth’s surface, in a sub aerial or aquatic environment, account for the structural homogeneity and glassiness of obsidian. It occurs with reddish patches on a black background and light veins.

Chemical composition: SiO2

Hardness: 5-6

Density: –

Family: –

Origin: Italy, USA, Mexico

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Machocany

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