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Latite
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.〔(Classification of Igneous Rocks )〕 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〔 Retrieved on 5 July 2015.〕 and as intrusive laccoliths and sills in South Dakota, USA.〔(【引用サイトリンク】 title=Latitic Intrusive Rocks )〕 ==See also==
* List of rock types * Porphyry
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Latite」の詳細全文を読む
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