melanite मीनिंग इन हिंदी

अधिक: आगे

The dark matrix consists of biotite, aegirine-augite and melanite.
Biotite occurs in some of these rocks, and melanite also is present.
Melanite is found in some of the lavas, as in the leucite syenites.
Their pyroxene is principally aegirine or aegirine-augite; some of them are rich in melanite.
Its chemical formula is O 7 It occurs mostly in skarns with melanite adjacent to an alkali syenite and has no economic value.
The accessory minerals are apatite, cancrinite, calcite, titanite and iivaarite, a dark-brown titaniferous variety of melanite-garnet.
Their lusters range from vitreous to subadamantine, to almost metallic in the usually opaque melanite, which has been used to simulate black diamond.
Among the accessory minerals biotite, brown hornblende, hauyne, iron oxides and apatite are the commonest; melanite and nepheline may also occur.
The abundance of melanite is very unusual in igneous rocks, though some syenites, leucitophyres, and aegirine-felsites resemble borolanite in this respect.
Other minerals common in minor amounts include sodium-rich pyroxene, biotite, titanite, iron oxides, apatite, fluorite, melanite garnet, and zircon.