N. 99949934

Ossidiana Teschio in ossidiana nera fine - Altezza: 9 cm - Larghezza: 6 cm- 522 g
N. 99949934

Ossidiana Teschio in ossidiana nera fine - Altezza: 9 cm - Larghezza: 6 cm- 522 g
Mexico
Fine Black obsidian Skull
Obsidian is produced from felsic lava, rich in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium. It is commonly found within the margins of rhyolitic lava flows known as obsidian flows. These flows have a high content of silica, granting them a high viscosity. The high viscosity inhibits diffusion of atoms through the lava, which inhibits the first step (nucleation) in the formation of mineral crystals. Together with rapid cooling, this results in a natural glass forming from the lava.[7]
Obsidian is hard, brittle, and amorphous; it therefore fractures with sharp edges.
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