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The mineral olivine (/ ˈ ɒ l. ɪ ˌ v iː n /) is a magnesium iron silicate with the chemical formula (Mg,Fe) 2 Si O 4.It is a type of nesosilicate or orthosilicate.The primary component of the Earth's upper mantle, [9] it is a common mineral in Earth's subsurface, but weathers quickly on the surface.
The largest cut peridot olivine is a 310-carat (62-gram) specimen in the gem collection of the Smithsonian Museum in Washington, D.C. Inclusions are common in peridot crystals but their presence depends on the location where it was found and the geological conditions that led to its crystallization.
Ringwoodite is a high-pressure polymorph of Mg 2 SiO 4 (magnesium silicate) that may contain iron and hydrogen. It is inferred to be the most abundant mineral in the lower part of the Earth's transition zone, where it affects mantle dynamics and seismicity.
Kimberlite: formed in volcanic pipes and at least 35% olivine [9] Kimberlite is a highly brecciated variant of peridotite formed in volcanic pipes and is known for being the host rock to diamonds. Unlike other forms of peridotite, kimberlite is quite rare. [10] Pyroxene peridotite: From 40% to 90% olivine and less than 5% hornblende
In its Sept. 2023 complaint, the Justice Department accused eBay of illegally allowing the sale of more than 343,000 aftermarket "defeat" devices that help vehicles generate more power and get ...
Ansel Adams was an American landscape photographer and environmentalist known for his black-and-white images of the American West. He developed the Zone System, advocated for conservation, and influenced photography as an art form.
Anorthosite is a rare igneous rock composed mostly of plagioclase feldspar and minor mafic minerals. It forms by fractional crystallization or magma mixing and has various types and origins on Earth, Moon and Mars.
PFG 1: A Field Guide to the Birds (1934), by Roger Tory Peterson . Second edition (1939): A Field Guide to the Birds Third edition (1947): A Field Guide to the Birds Fourth edition (1980): A Field Guide to the Birds: A Completely New Guide to All the Birds of Eastern and Central North America