Search results
Results from the WOW.Com Content Network
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 principal source of peridot olivine today is the San Carlos Apache Indian Reservation in Arizona. [ a ] It is also mined at another location in Arizona , and in Arkansas , Hawaii , Nevada , and New Mexico at Kilbourne Hole , in the US; and in Australia , Brazil , China , Egypt , Kenya , Mexico , Myanmar (Burma), Norway , Pakistan , Saudi ...
The Olivine Ice Plateau is a glacier in the Olivine Wilderness Area [1] and Aspiring National Park in New Zealand's South Island. [2] The plateau is named after the mineral olivine , which is common within the Dun Mountain ophiolite that underlies the area. [ 3 ]
It is located on a volcanic field that also shows evidence of ultramafic xenoliths. Bearpaw Mountain is mostly dominated by olivine and micas that have mostly coarse and granular texture. Just like Highwood Mountain, Bearpaw Mountain is part of the Wyoming craton and derived from the lower lithosphere . [ 11 ]
Photomicrograph of a thin section showing the strong presence of olivine (brightly colored, rounded grains) surrounded by plagioclase and pyroxene grains within the olivine-rich zone. Crossed polars, 40x. Due to the presence of the olivine-rich zone, the normally difficult task of determining the history of an igneous body becomes even tougher.
In chemical analysis the rocks are nearly identical; however, the early stage minerals, olivine and pyroxene, were preserved in one and not the other, giving the rocks sharply different weathering properties. The rock that retained the olivine and pyroxene crystals (OPM) is extremely resistant to weathering and is the material which forms the tors.
Kmart's last remaining full-sized location in the continental U.S. will close Oct. 20, a store associate confirmed to Scripps News. The store began offering clearance sales, which as of Tuesday ...
The distinctive characteristic of olivine lamproites is phlogopite macrocrysts and microphenocrysts, together with groundmass micas that vary in composition from phlogopite to "tetraferriphlogopite" (anomalously Al-poor phlogopite requiring Fe to enter the tetrahedral site). Resorbed olivine macrocrysts and euhedral primary crystals of ...