Olivine sentence example
The boulder is a crystalline rock consisting of pyroxene (chrome-diopside), garnet, and a little olivine, and is studded with diamond crystals; a portion of it is preserved in the British Museum (Natural History).
They are soft and lustrous, with a peculiarly smooth feel, and though often confounded with mica-schists may be distinguished by their richness in magnesia; many of them contain tremolite or actinolite; others have residual grains of olivine or augite; and here also every gradation can be found between the unmodified igneous types and the perfectly metamorphic schists.
They found relatively large grains and many small crystals of a mineral called olivine.
The most common ferromagnesian minerals include olivine, pyroxene, amphibole and mica.
The Green Sand Beach in the south of the island of Hawaii (Big Island) contains just this green, well-rounded olivine.Advertisement
Much of the dolerite found in these places has a greenish tinge because of the presence of the mineral olivine.
Diabases pierce to Devonian rocks, and olivine rocks appear as dykes amidst the Triassic deposits.
Magnesium is found widely distributed in nature, chiefly in the forms of silicate, carbonate and chloride, and occurring in the minerals olivine, hornblende, talc, asbestos, meerschaum, augite, dolomite, magnesite, carnallite, kieserite and kainite.
The other minerals found in the concentrates are pebbles and fragments of pyrope, zircon, cyanite, chrome-diopside, enstatite, a green pyroxene, mica, ilmenite, magnetite, chromite, hornblende, olivine, barytes, calcite and pyrites.
Biotite and olivine are not really frequent in these rocks, and usually have been affected by resorption.Advertisement
In addition to the reddish or brownish argillaceous matrix it contains fresh or decomposed crystals of volcanic minerals, such as felspar, augite, hornblende, olivine and pumiceous or palagonitic rocks.