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.

[1] Biotite, hornblende, pyroxene and scarce olivine or quartz are common accessory minerals.

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[3] and as intrusive laccoliths and sills in South Dakota, USA.

Photomicrograph of thin section of latite (in plane polarised light)
Photomicrograph of thin section of latite (in cross polarised light)