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Spherulites in rhyolitic ash, Hailstone Trail, Echo Canyon, Chiricahua Mountains, Arizona Spherulite markings on snowflake obsidian Photomicrograph of rhyolite, showing spherulitic texture (brown, between grey to white crystals) In petrology, spherulites (/ ˈ s f ɛr ʊ l aɪ t s, s f ɪər-/) are small, rounded bodies that commonly occur in ...
Pig carved in snowflake obsidian, 10 centimeters (4 in) long. The markings are spherulites. Obsidian is also used for ornamental purposes and as a gemstone. [67] It presents a different appearance depending on how it is cut: in one direction it is jet black, while in another it is glistening gray.
These rocks are usually found within obsidian or rhyolite lava flows. [2] Lavas low in feldspar minerals may produce a version known as snowflake obsidian . These cavities are believed to be caused by expanding gases in tuffs and rhyolitic lavas before solidification. [ 1 ]
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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 ...