Igneous Rock Textures In Thin Section

Some common rock types as seen under the microscope.

Igneous rock textures in thin section. Apatite is colorless commonly elongate and typically has hexagonal end sections. Other factors include the diffusion rate which is how atoms and molecules move through the liquid. Apatite is extremely common in small amounts in igneous rocks.

The very low 1 st order birefringence is obvious and it has negative sign of elongation. Properties of igneous rock textures. Crystal completely bounded by its own crystal faces.

Atlas of igneous rocks and their textures a companion volume to the atlas of rock forming minerals in thin section this full colour handbook is designed to be used as a laboratory manual both by elementary students of earth sciences undertaking a study of igneous rocks in thin section under the microscope and by more advanced students and teachers as a reference work. Rocks under the microscope. Glomerocrysts are clumps of large crystals set in a fine grained matrix a variety of phenocrystic texture.

An introduction to igneous petrology. Other textures that may be evident on microscopic examination of igneous rocks are as follows. Before enough other crystals were present to cause.

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. Myrmekitic texture an intergrowth of quartz and plagioclase that shows small wormlike bodies of quartz enclosed in plagioclase. Classification textures microstructures and mineral preferred orientations.

It all comes down to the rate at which the rock cools. This texture is common in diabases and gabbros. This texture is found in granites.