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  2. Volcanic glass - Wikipedia

    en.wikipedia.org/wiki/Volcanic_glass

    The glass transition temperature of basalt is about 700 °C (1,292 °F). [4] 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 ...

  3. Obsidian - Wikipedia

    en.wikipedia.org/wiki/Obsidian

    Like all glass and some other naturally occurring rocks, obsidian breaks with a characteristic conchoidal fracture. It was also polished to create early mirrors. Modern archaeologists have developed a relative dating system, obsidian hydration dating, to calculate the age of obsidian artifacts.

  4. Looking Glass Rock - Wikipedia

    en.wikipedia.org/wiki/Looking_Glass_Rock

    Looking Glass Rock is a popular rock climbing destination. Whether it is free climbing, multi-pitch or aid climbing, dozens of routes traverse the South Face, North Face, Nose Area, Sun Wall, Invisible Wall and Hidden Wall to the top of the mountain. From the top of Looking Glass Rock, panoramic views can be seen of the Blue Ridge Parkway and ...

  5. Helenite - Wikipedia

    en.wikipedia.org/wiki/Helenite

    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.

  6. Looking Glass (band) - Wikipedia

    en.wikipedia.org/wiki/Looking_Glass_(band)

    Looking Glass is an American pop rock band formed in New Jersey that were active during the early 1970s. They are known for their chart-topping 1972 hit song "Brandy (You're a Fine Girl)", which reached No. 1 on both the U.S. Billboard Hot 100 and Cash Box Top 100 charts, remaining in the top position for one week.

  7. Old fashioned glass - Wikipedia

    en.wikipedia.org/wiki/Old_fashioned_glass

    The old fashioned glass, otherwise known as the rocks glass, whiskey glass, and lowball glass [1] [2] (or simply lowball), is a short tumbler used for serving spirits, such as whisky, neat or with ice cubes ("on the rocks"). It is also normally used to serve certain cocktails, such as the old fashioned.

  8. Apache tears - Wikipedia

    en.wikipedia.org/wiki/Apache_tears

    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 ...

  9. Volcanic rock - Wikipedia

    en.wikipedia.org/wiki/Volcanic_rock

    Volcanic rocks are usually fine-grained or aphanitic to glass in texture. They often contain clasts of other rocks and phenocrysts. Phenocrysts are crystals that are larger than the matrix and are identifiable with the unaided eye. Rhomb porphyry is an example with large rhomb shaped phenocrysts embedded in a very fine grained matrix.

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