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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.
Magma rich in silica and poor in dissolved water is most easily cooled rapidly enough to form volcanic glass. As a result, rhyolite magmas, which are high in silica, can produce tephra composed entirely of volcanic glass and may also form glassy lava flows. [2] Ash-flow tuffs typically consist of countless microscopic shards of volcanic glass. [3]
The Blenko Glass plant employed 115 people near the end of 1950. Daily production was about 1,000 square feet of stained glass sheets and about 3,000 pieces of glassware. William H. Blenko Sr. was the president, and his son William H. Blenko Jr. was company secretary and plant manager. [42]
American stained glass artists and manufacturers (2 C, 74 P) C. Corning Inc. (1 C, 32 P) T. Tiffany Studios (18 P) Pages in category "Glassmaking companies of the ...
In 2019, the company announced plans to invest 3 billion taka to modernize its factory in Chittagong. The company had been producing glass using Fourcault process which is costlier than the Float glass process used by private manufacturers in Bangladesh. The company had to sell their products at below manufacturing costs and had been making a ...
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"We can trust these results," Glavin said. Bennu's icy parent body, perhaps about 60 miles (100 km) in diameter, appears to have formed in the outer solar system and was later destroyed, possibly ...
Enamel can be used on metal, glass, ceramics, stone, or any material that will withstand the fusing temperature. In technical terms fired enamelware is an integrated layered composite of glass and another material (or more glass). The term "enamel" is most often restricted to work on metal, which is the subject of this article.
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