Diorite In Thin Section

Diorite is usually composed of sodium rich plagioclase with lesser amounts of hornblende biotite and pyroxene minerals.

Diorite in thin section. Diorite in plane polars diorite in crossed polars another diorite in plane polars another diorite in crossed polars. In the iugs classification diorite contains 0 5 q p a p 90 and the plagioclase composition an50. This makes diorite a coarse grained rock with a contrasting mix of black and white mineral grains.

It usually contains little if any quartz. Diorite in hand sample. Diorite intrusive igneous plutonic.

This means that biotite in standard thin sections rarely goes completely extinct. Diorite ppl diorite plane polars. In thin section this diorite contains laths of plagioclase feldspar often 2 3 millimetres long and minor amounts of quartz.

These are photomicrographs very thin slices of rock seen in plane polarised light or between crossed polarisers when the colours seen are produced by interference of light. This is called incomplete extinction or sometimes birds eye maple extinction. This is a good standard for a diorite and contains predominantly plagioclase feldspar an.

It typically contains very little quartz. Mafic minerals are biotite and hornblende in about equal proportions. Diorite in thin section thin section gigapans.

Diorite is composed primarily of plagioclase feldspar amphibole and pyroxine minerals with small amounts of biotite mica. Diorite is a coarse grained intrusive igneous rock that is intermediate in composition between granite and gabbro. Diorite two small samples of diorite diorite intruded by granite pegmatite dike.