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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.
Cristobalite (/ k r ɪ ˈ s t oʊ b ə ˌ l aɪ t /) is a mineral polymorph of silica that is formed at very high temperatures. It has the same chemical formula as quartz, Si O 2, but a distinct crystal structure.
They can have an average diameter 5–20 centimetres (2.0–7.9 in), [3] but can be much larger (for example, 300–370 centimetres (10–12 ft) at Silver Cliff in Colorado). Lithophysae are also related to the spherulites found in obsidians on the Italian island of Lipari , in Yellowstone National Park , and other places.
Macro photography of a natural snowflake. A snowflake is a single ice crystal that is large enough to fall through the Earth's atmosphere as snow. [1] [2] [3] Snow appears white in color despite being made of clear ice.
Under the microscope the spherulites are of circular outline and are composed of thin divergent fibers that are crystalline as verified with polarized light. Between crossed Nicols, a black cross appears in the spherulite; its axes are usually perpendicular to one another and parallel to the crosshairs; as the microscope stage is rotated the cross remains steady; between the black arms there ...
A drawing from the Catalog of the Royal Armoury of Madrid by the medievalist Achille Jubinal in the 19th century. The original specimen was destroyed by a fire in 1884. The maquahuitl (Classical Nahuatl: māccuahuitl, other orthographic variants include mākkwawitl and mācquahuitl; plural māccuahuimeh), [4] a type of macana, was a common weapon used by the Aztec military forces and other ...
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In October 2014, Snowflake came out of stealth mode; at that time it was used by 80 organizations. [3] [4] Snowflake has run on Amazon Web Services since 2014, [5] [6] on Microsoft Azure since 2018, [7] and on the Google Cloud Platform since 2019. [8] [9] In June 2015, Snowflake launched its first product, its cloud data warehouse. [10]