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Peridot olivine is the birthstone for the month of August. [17] Peridot has often been mistaken for emerald beryl and other green gems. [18] Noted gemologist G.F. Kunz discussed the confusion between beryl and peridot in many church treasures, most notably the "Three Magi treasure" in the Dom of Cologne, Germany. [19] [1]
The word peridotite comes from the gemstone peridot, which consists of pale green olivine. [1] Classic peridotite is bright green with some specks of black, although most hand samples tend to be darker green. Peridotitic outcrops typically range from earthy bright yellow to dark green; this is because olivine is easily weathered to iddingsite ...
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.
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.
Dunite may also form by the accumulation of olivine crystals on the floor of large basaltic or picritic magma chambers. These " cumulate " dunites typically occur in thick layers in layered intrusions , associated with cumulate layers of wehrlite , olivine pyroxenite , harzburgite , and even chromitite (a cumulate rock consisting largely of ...
It consists of centimetre-sized olivine crystals of peridot quality in an iron-nickel matrix. Coarser metal areas develop Widmanstätten patterns upon etching. Minor constituents are schreibersite , troilite , chromite, pyroxenes, and phosphates ( whitlockite , stanfieldite, farringtonite, and merrillite ).
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