What does equigranular mean?

What does equigranular mean?

: having or characterized by crystals of nearly the same size a rock of equigranular texture.

What is equigranular in geology?

equigranular – consisting of minerals or clasts of approximately the same size. extrusive – equivalent of volcanic, i.e. erupted.

What type of rock is equigranular?

Equigranular Texture Rocks with equigranular (“EC-wi-GRAN-ular”) have mineral grains that are generally the same size. This example is a granite.

Is quartz an Aphanitic?

Aphanites are commonly porphyritic, having large crystals embedded in the fine groundmass, or matrix. They consist essentially of very small crystals of minerals such as plagioclase feldspar, with hornblende or augite, and may contain also biotite, quartz, and orthoclase.

What is Phaneritic and Aphanitic?

APHANITIC TEXTURE – Igneous rocks that form on the earth’s surface have very fine-grained texture because the crystals are too small to see without magnification. PHANERITIC TEXTURE – Igneous rocks with large, visible crystals because the rock formed slowly in an underground magma chamber.

How is Equigranular texture formed?

Equigranular Textures: All those textures in which majority of constituent crystals of a rock are broadly equal in size are described as equigranular textures. In the granitic texture, the constituents are either all coarse grained or all medium grained and the crystals show euhedral to subhedral outlines.

How is equigranular texture formed?

Is Basalt a equigranular?

An equigranular material is composed chiefly of crystals of similar orders of magnitude to one another. Basalt and gabbro commonly exhibit an equigranular texture.

How can you tell if a rock is Aphanitic?

Fine Grained Texture (Aphanitic), Mineral Grains Smaller Than 1mm (Need Hand Lens or Microscope to See Minerals) Aphanitic texture consists of small crystals that cannot be seen by the eye with or hand lens. The entire rock is made up of small crystals, which are generally less than 1/2 mm in size.

Is there olivine in granite?

Olivine is typically with pyroxenes (in basalt, for example) and quartz + K-feldspar with micas (biotite and muscovite) is a typical composition of granite. Olivine is a common rock-forming mineral in mafic and ultramafic igneous rocks, but it also occurs in impure metamorphosed carbonate rocks (picture below).

What does the term porphyritic mean?

1 : of or relating to porphyry. 2 : having distinct crystals (as of feldspar) in a relatively fine-grained base.

What does felsic stand for?

Felsic refers to silicate minerals, magma, and rocks which are enriched in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium. Felsic magma or lava is higher in viscosity than mafic magma/lava. Felsic rocks are usually light in color and have specific gravities less than 3.