A plutonic (intrusive) igneous rock that is coarse-grained and composed mainly of plagioclase feldspar, pyroxene and some amphibole (especially hornblende) and biotite with small amounts of quartz and K-feldspar.
is a common intrusive rock consisting of 80-100% of feldspar (mostly plagiocase), very little if any Quartz and sometimes up to 50% of dark minerals.
A group of plutonic rocks intermediate in composition between acidic and basic.
Light and dark (salt and pepper), medium- to coarse-grained intrusive igneous rock, commonly massive-appearing, generally lacking layering or banding; composed primarily of plagioclase feldspar, quartz and dark minerals.
Any of a group of dark, phaneritic, intrusive rocks that are the plutonic equivalents of andesite.
A phaneritic intrusive igneous rock consisting mostly of intermediate plagioclase feldspar and pyroxene, with some amphibole and biotite.
a granular crystalline intrusive rock
an intrusive igneous rock with a coarse grained texture composed mainly of the minerals plagioclase feldspar, pyroxene and hornblende.
Intrusive igneous rock made of plagioclase feldspar and amphibole and/or pyroxene. Similar to gabbro only not as so dark, and containing less iron and magnesium.
A grey intrusive igneous rock composed of mostly feldspar and biotite, pyroxene or amphibole; it forms dykes and small stocks; it is the intrusive equivalent of andesite.
A medium-gray-colored, coarse-grained, intrusive igneous rock, often with a "salt-and-pepper" appearance. It is intermediate in composition (half-way between felsic and mafic) and is the intrusive equivalent of andesite.
An igneous rock formed by the solidification of molten material (magma).
an intrusive rock of magnatic origin
Plagioclase (Sodium-rich) feldspar, quartz less than 10%, mafic minerals about 25
Igneous plutonic rock, less mafic than gabbro, but more mafic than granite and granodiorite; rough plutonic equivalent of andesite.
An intrusive igneous rock with a mixture of dark and light minerals
plutonic rock, mesocratic, composed of plagioclase and amphibole crystals.
Granular, crystallized igneous stone composed of feldspar and hornblende.
Any of various dark, granite-textured, crystalline rocks rich in plagioclase and having little quartz.
a coarse-grained igneous rock solidified far below the earth's surface and consisting essentially of hornblende and plagioclase containing sodium. [AHDOS
An intrusive igneous rock of intermediate composition, often called “salt-and-pepper” rock because of its speckled black and white appearance. The main minerals present are plagioclase and hornblende. Around the world, diorite forms below volcanoes along convergent boundaries, and its extrusive equivalent is andesite.
plutonic rock with composition intermediate between granite and gabbro; the intrusive equivalent of andesite.
Diorite (IPA: ) is a grey to dark grey intermediate intrusive igneous rock composed principally of plagioclase feldspar (typically andesine), hornblende, and/or pyroxene. It can also be black or bluish-grey, and frequently has a greenish cast. Varieties deficient in hornblende and other dark minerals are called leucodiorite.
