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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.
Cut glass wine glass made of lead glass. Lead glass, commonly called crystal, is a variety of glass in which lead replaces the calcium content of a typical potash glass. [1] Lead glass contains typically 18–40% (by mass) lead(II) oxide (PbO), while modern lead crystal, historically also known as flint glass due to the original silica source, contains a minimum of 24% PbO. [2]
The use of "crystal" as a marketing term for glass has continued into modern times, though for at least the last century it has normally meant lead crystal glass of the type developed by Ravenscroft. Cristallo could be made extremely thin, thus reducing the remaining hint of color, and the Venetians usually made clear pieces this way. [36]
Sofiero cut crystal glass bowl designed by Gunnar Cyrén 1960. Orrefors Glassworks (also known as just Orrefors) is a glassworks in the Swedish village Orrefors in Småland. Orrefors manufactured crystal glassware and art glass. The range consisted of crystal stemware, barware, vases, and sculptures and lighting products in crystal. The ...
Bowl of a wine glass in typical cut glass style Cut glass chandelier in Edinburgh. Cut glass or cut-glass is a technique and a style of decorating glass. For some time the style has often been produced by other techniques such as the use of moulding, but the original technique of cutting glass on an abrasive wheel is still used in luxury products.
The mechanisms controlling formation of volcanic glass are further illustrated by the two forms of basaltic glass, tachylite and sideromelane. Tachylite is opaque to transmitted light because of the abundance of tiny oxide mineral crystals suspended in the glass. Sideromelane is partially transparent because it contains much fewer crystals.
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