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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 ...
The Hebrews obtained gemstones from the Middle East, India, and Egypt. [1] At the time of the Exodus, the Bible states that the Israelites took gemstones with them (Book of Exodus, iii, 22; xii, 35–36). When they were settled in the Land of Israel, they obtained gemstones from the merchant caravans travelling from Babylonia or Persia to Egypt ...
Bian stone therapy [2] is one of humanity's oldest medical practices. The Bian-stone technique refers to the use of stone-based equipment to perform massaging, heating, and other operations. The devices are called bian stone tools. Bian-stone includes both the bian-stone technique and the tool. When used in medical institutions for therapeutic ...
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.
Greek agate is a name given to pale white to tan colored agate found in the former Greek colony of Sicily as early as 400 BCE. The Greeks used it for making jewelry and beads. Brazilian agate is found as sizable geodes of layered nodules. These occur in brownish tones inter-layered with white and gray.
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