1: Granite is a classic coarse-grained (phaneritic) intrusive igneous rock. The different colors are unique minerals. The black colors are likely two or three different minerals. If magma cools slowly, deep within the crust, the resulting rock is called intrusive or plutonic.Feb 14, 2021
Granite is a coarse-grained rock composed of aluminosilicate minerals that crystallizes slowly and at much higher temperatures than basalt.
Coarse-Grained (Phaneritic) Textures. Coarse-grained textures generally indicate magmas that slowly cooled deep underground. Slow cooling gives crystals enough time to grow to easily seen sizes (i.e., larger than 1 mm).
Extrusive or volcanic rocks crystallize from lava at the earth's surface. The texture of an igneous rock (fine-grained vs coarse-grained) is dependent on the rate of cooling of the melt: slow cooling allows large crystals to form, fast cooling yields small crystals.
Fine Grain This type of granite has a softer look to it that many people enjoy. There are few areas of the same color, which some homeowners prefer when installing a granite countertop . Like with coarse grain , fine grain granite looks different depending on where, and how deep, the rock is formed.
Texture - phaneritic (medium to coarse grained). Mineral content - orthoclase, plagioclase and quartz (generally more orthoclase than plagioclase), often with smaller amounts of biotite, muscovite or amphibole ( hornblende). Silica (SiO 2) content - 69%-77%. Uses - can be used as aggregate, fill etc.
granite, coarse- or medium-grained intrusive igneous rock that is rich in quartz and feldspar; it is the most common plutonic rock of the Earth's crust, forming by the cooling of magma (silicate melt) at depth.
having a coarse texture or grain. indelicate; crude; vulgar; gross: a coarse-grained person with vulgar manners.
Coarse-grained materials or systems have fewer, larger discrete components than fine-grained materials or systems. A coarse-grained description of a system regards large subcomponents. A fine-grained description regards smaller components of which the larger ones are composed.
GraniteTypeIgneous rockTexturePhaneritic (Coarse-grained)OriginIntrusive/PlutonicChemical CompositionFelsicColorPredominantly white2 more rows
Intrusive igneous rock is formed when magma cools and solidifies within small pockets contained within the planet's crust. As this rock is surrounded by pre-existing rock, the magma cools slowly, which results in it being coarse grained – i.e. mineral grains are big enough to be identifiable with the naked eye.Dec 16, 2015
(a) Said of a crystalline rock, and of its texture, in which the individual minerals are relatively large; specif. said of an igneous rock whose particles have an average diameter greater than 5 mm (0.2 in.).Oct 7, 2018