Is Kimberlite a peridotite?
Kimberlite: a peridotite that is composed of at least 35% olivine with significant amounts of other minerals that might include phlogopite, pyroxenes, carbonates, serpentine, diopside, monticellite, and garnet. Kimberlite sometimes contains diamonds.
Is olivine a peridotite?
Olivine is the essential mineral found in all peridotites. It is a magnesium orthosilicate containing some iron with the variable formula (Mg,Fe) 2SiO 4. The magnesium-rich olivine of peridotites is typically olive-green in color.
How do I identify my kimberlite?
Kimberlites are very diverse, but generally have distinct trace mineralogy. The only way to absolutely identify one is by thin section and chemistry. And finding a kimberlite that contains diamonds is even rarer – most do not.
Is peridotite rich in the mineral olivine quartz or mica?
Peridotite is a very dense, coarse-grained, olivine-rich, ultra- mafic intrusive rock. It is noted for its low silica content, and contains very little or no feldspar ( orthoclase, plagioclase). It is a common component of oceanic lithosphere, and is derived from the upper mantle.
How do we know peridotite makes up the upper mantle?
Solid Rock Scientists know that the mantle is made of rock based on evidence from seismic waves, heat flow, and meteorites. The properties fit the ultramafic rock peridotite, which is made of the iron- and magnesium-rich silicate minerals (Figure below). Peridotite is rarely found at Earth’s surface.
What is peridotite composition?
peridotite, a coarse-grained, dark-coloured, heavy, intrusive igneous rock that contains at least 10 percent olivine, other iron- and magnesia-rich minerals (generally pyroxenes), and not more than 10 percent feldspar.
What is peridotite quizlet?
Peridotite is a dense, coarse-grained igneous rock consisting mostly of the minerals olivine and pyroxene. ultramafic. It is high in magnesium, reflecting the high proportions of magnesium-rich olivine, with appreciable iron.
How can you tell if a stone is a diamond?
Lay the stone onto the dot with the flat side down. Through the pointed end of the diamond, look down onto the paper. If you see a circular reflection inside the gemstone, the stone is fake. If you cannot see the dot or a reflection in the stone, then the diamond is real.