melilite वाक्य
उदाहरण वाक्य
मोबाइल
- Crossed polarized light image of melilite in Moiliili lava flow, Moiliili Quarry, Honolulu, O ahu, Hawai i surrounded by matrix of granular nepheline and volcanic glass.
- Minerals with the melilite structure may show a cleavage parallel to the ( 001 ) crystallographic directions and may show weaker cleavage perpendicular to this, in the { 110 } directions.
- Nyiragongo's lavas are made of melilite nephelinite, an alkali-rich type of volcanic rock whose unusual chemical composition may be a factor in the unusual fluidity of the lavas there.
- It occurs with calcite, ettringite, wollastonite, larnite, brownmillerite, gehlenite, diopside, pyrrhotite, grossular, spinel, afwillite, jennite, portlandite, jasmundite, melilite, kalsilite and corundum in the limestone xenoliths.
- The presence of the following minerals precludes a rock from being classified as a lamproite : primary plagioclase, melilite, monticellite, kalsilite, nepheline, Na-rich alkali feldspar, sodalite, nosean, hauyne, melanite, schorlomite or kimzeyite.
- The most famous of the rocks of Aln�n is the " alnoite ", named from the Island, which is a lamprophyre chiefly composed of biotite or phlogopite and melilite as essential minerals, commonly with olivine, calcite and clinopyroxene.
- Sanidine, melanite, hauyne and perovskite are frequent accessory minerals in these rocks, and many of them contain melilite in some quantity, The well-known leucitite of the Capo di Bove, near, Rome, is rich in this mineral, which forms irregular plates, yellow in the hand specimen, enclosing many small rounded crystals of leucite.
- Mitchell has suggested that rocks belonging to the " lamprophyre facies " are characterized by the presence of phenocrysts of mica and / or amphibole together with lesser clinopyroxene and / or melilite set in a groundmass which may consist ( either singly or in various combinations ) of plagioclase, alkali feldspar, feldspathoids, carbonate, monticellite, melilite, mica, amphibole, pyroxene, perovskite, Fe-Ti oxides and glass.
- Mitchell has suggested that rocks belonging to the " lamprophyre facies " are characterized by the presence of phenocrysts of mica and / or amphibole together with lesser clinopyroxene and / or melilite set in a groundmass which may consist ( either singly or in various combinations ) of plagioclase, alkali feldspar, feldspathoids, carbonate, monticellite, melilite, mica, amphibole, pyroxene, perovskite, Fe-Ti oxides and glass.
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