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Latite

Avatar 37a3bd7bc7328f0ead2c0f6f635dddf60615e676e6b4ddf964144012e529de45 kiran asked over 2 years ago

Write a note on Latite?

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Avatar 37a3bd7bc7328f0ead2c0f6f635dddf60615e676e6b4ddf964144012e529de45 answered over 2 years ago

Latite is an igneous, volcanic rock, with aphanitic-aphyric to aphyric-porphyritic texture. Its mineral assemblage is usually alkali feldspar and plagioclase in approximately equal amounts. Quartz is less than five percent and is absent in a feldspathoid-bearing latite, and olivine is absent in a quartz-bearing latite. When quartz content is greater than five percent the rock is classified as quartz latite. Biotite, hornblende, pyroxene and scarce olivine or quartz are common accessory minerals.

Rhomb porphyries are an unusual variety with gray-white porphyritic rhomb shaped phenocrysts embedded in a very fine grained red-brown matrix. The composition of rhomb porphyry places it in the trachyte – latite classification of the QAPF diagram.

Latite is found, for example, as lavas in Bulgaria and as intrusive laccoliths and sills in South Dakota, USA.


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