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Obsidian (/ ə b ˈ s ɪ d i. ən, ɒ b-/ əb-SID-ee-ən ob-) [5] is a naturally occurring volcanic glass formed when lava extruded from a volcano cools rapidly with minimal crystal growth. It is an igneous rock. [6] Obsidian is produced from felsic lava, rich in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium.
Apache tears are rounded pebbles of obsidian or "obsidianites" composed of black or dark-colored natural volcanic glass, usually of rhyolitic composition and bearing conchoidal fracture. Also known by the lithologic term marekanite, this variety of obsidian occurs as subrounded to subangular bodies up to about 2 in (51 mm) in diameter, often ...
Helenite, also known as Mount St. Helens obsidian, emerald obsidianite, and ruby obsidianite, is a glass made from the fused volcanic rock dust from Mount St. Helens and marketed as a gemstone. [1][2] Helenite was first created accidentally after the eruption of Mount St. Helens in 1980. Workers from the Weyerhaeuser Timber Company were ...
Raw obsidian and obsidian blades, examples of Maya commodities, As trade grew in the Postclassic period, so did the demand for commodities. Many of these were produced in large specialized factory-like workshops around the empire, and then transported elsewhere mostly by sea due to poor roads and heavy cargo. [16]
Obsidian is a naturally formed volcanic glass that was an important part of the material culture of Pre-Columbian Mesoamerica. Obsidian was a highly integrated part of daily and ritual life, and its widespread and varied use may be a significant contributor to Mesoamerica's lack of metallurgy.
Maya pendant in the Los Angeles County Museum of Art Map showing the locations of some of the main jade, obsidian and serpentine sources in Mesoamerica. The archaeological search for the Mesoamerican jade sources, which were largely lost at the time of the Maya collapse, began in 1799 when Alexander von Humboldt started his geological research in the New World.
In the Late Postclassic (c. 1200–1521) obsidian came to be the stone of preference for fashioning mirrors in Central Mexico. [6] Broken pieces of raw obsidian were likely to have been used as mirrors as far back as the Preclassic but obsidian was not commonly ground and polished to manufacture mirrors until this period. [6]
Website. obsidian.md. Obsidian is a personal knowledge base and note-taking software application that operates on Markdown files. [3][4][5] It allows users to make internal links for notes and then to visualize the connections as a graph. [6][7] It is designed to help users organize and structure their thoughts and knowledge in a flexible, non ...
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