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Título: Obsidian, Lake County, Oregon
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Obsidian is volcanic glass. It forms when magma (molten rock) is ejected into the air during volcanic activity and chills (cools) so quickly that mineral crystals do not have a chance to form. Obsidian breaks with the conchoidal fracture characteristic of all glass. It is usually black, but may have bands or inclusions that create various optical effects, including a reflective 'sheen' in silver, gold or even rainbow colors.
Crédito: Album / Science Source / JOEL AREM
Tamaño imagen: 3851 × 2550 px | 28.1 MB
Tamaño impresión: 32.6 × 21.6 cm | 1516.1 × 1003.9 in (300 dpi)