Search results
Results From The WOW.Com Content Network
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 ]
In some stones, the inclusion of small, white, radially clustered crystals (spherulites) of the mineral cristobalite in the black glass produce a blotchy or snowflake pattern (snowflake obsidian). Obsidian may contain patterns of gas bubbles remaining from the lava flow, aligned along layers created as the molten rock was flowing before being ...
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 .
Terraria has been described as a Minecraft clone by various video gaming media outlets. [81] [87] Terraria sold 200,000 copies in just over a week after its release, [88] and over 432,000 within a month. [89] By May 2022, over 44.5 million copies of Terraria had been sold, making it one of the best-selling video games of all time. The total is ...
The major criterion to distinguish "snowflake" unique content from run-of-the-mill content is the "critical commentary" test: Has the item merited comments that suppose a value judgment or elaborate critique (i.e. information other than a routine description of its properties) by independent critics?
From a subtopic: This is a redirect from a subtopic of the target article or section.. If the redirected subtopic could potentially have its own article in the future, then also tag the redirect with {{R with possibilities}} and {{R printworthy}}.
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.
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 ...