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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 ...
The source of obsidian for cultures inhabiting the territory of and around Greece was the island of Milos; the Starčevo–Körös–Criș culture obtained obsidian from sources in Hungary and Slovakia, while the Cardium-Impresso cultural complex acquired obsidian from the island outcrops of the central Mediterranean.
Shungite has been used since the middle of the 18th century as a pigment for paint, [10] and is currently sold under the names "carbon black" or "shungite natural black". [8] In the 1970s, shungite was exploited in the production of an insulating material, known as shungisite .
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 .
Obsidian projectile point.. 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.
The ticitl were also good at performing surgical procedures by using knives which were made from volcanic glass (obsidian), the Ticitl would use these knives for procedures that involved the removing of tumors and the draining of wounds. Along with these obsidian knives, Ticitl would use different part of plants as tools for their procedures.
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Beryl, though sometimes colourless (not white), is usually of a light blue bordering on a yellowish green; emerald is more transparent and of a finer hue than beryl. Beryl is also black in colour. As a gem, it is considered more beautiful, and therefore more expensive - aqua marine is a beautiful sea-green variety.
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