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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.
Peridotite is named for the gemstone peridot, a glassy green gem originally mined on St. John's Island in the Red Sea [65] and now mined on the San Carlos Apache Indian Reservation in Arizona. [ 66 ] Peridotite that has been hydrated at low temperatures is the protolith for serpentinite , which may include chrysotile asbestos (a form of ...
Gamma Geminorum (γ Geminorum, abbreviated Gamma Gem, γ Gem), formally named Alhena / æ l ˈ h iː n ə /, [13] is the third-brightest object in the constellation of Gemini. It has an apparent visual magnitude of 1.9, [ 2 ] making it easily visible to the naked eye even in urban regions .
In 2000, near Fukang, China, a Chinese dealer obtained a mass from Xinjiang Province, China, with a weight of 1,003 kilograms (2,211 lb).He removed about 20 kilograms (44 lb) from the main mass, and in February 2005, the meteorite was taken to the Tucson Gem and Mineral Show, where it was seen by Dr. Dante Lauretta, a professor of Planetary Science and Cosmochemistry at the University of Arizona.
Sigma Geminorum (σ Gem) is a binary star [9] system in the constellation Gemini, just to the northwest of Pollux. It is visible to the naked eye with an apparent visual magnitude of 4.20. [ 2 ] Its annual parallax shift of 26.08 mas [ 1 ] indicates that it is located 125 light years from the Sun .
Chi Geminorum (χ Gem) is a binary star system in the constellation Gemini, near the eastern border with Cancer. It can be viewed with the naked eye on a dark night, having an apparent visual magnitude of 4.98. [2] Based upon an annual parallax shift of 12.73 mas, [1] it is located roughly 260 light years from the Sun.
Zeta Geminorum (ζ Geminorum, abbreviated Zeta Gem, ζ Gem) is a bright star with cluster components, distant optical components and a likely spectroscopic partner in the zodiac constellation of Gemini — in its south, on the left 'leg' of the twin Pollux. It is a classical Cepheid variable star, of which over 800 have been found in our galaxy.
WY Geminorum is a binary star system in the northern constellation of Gemini, abbreviated WY Gem.It has an apparent visual magnitude that ranges from 7.26 down to 7.51, [4] which is too faint to be readily viewed with the naked eye.