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Home » Rocks » Igneous Rocks » Diorite

Diorite


What is Diorite?



Diorite is a coarse-grained, intrusive igneous rock that is intermediate in composition between granite and gabbro. It’s composition is very similar to the fine-grained extrusive rock known as andesite.

Diorite is composed primarily of plagioclase feldspar, amphibole, and pyroxine minerals with small amounts of biotite mica. It typically contains very little quartz.

When identifying diorite look for a rock that as abundant white and dark minerals - a “salt and pepper” appearance. With a hand lens look for the cleavage faces of plagioclase feldspar intersecting at oblique angles. Also, look for vitreous cleavage faces on the dark amphibole minerals.


IGNEOUS ROCKS
Andesite
Andesite
Basalt
Basalt
Quartz Diorite
Diorite
Gabbro
Gabbro
Granite
Granite
Obsidian
Obsidian
Pegmatite
Pegmatite
Peridotite
Peridotite
Pumice
Pumice

Rhyolite
Rhyolite

Scoria
Scoria

Welded Tuff
Tuff

METAMORPHIC ROCKS
Amphibolite
Amphibolite
Gneiss
Gneiss
Hornfels
Hornfels
Marble
Marble
Novaculite
Novaculite

Phyllite
Phyllite

Quartzite
Quartzite

Muscovite Schist
Schist

Slate
Slate

Soapstone
Soapstone

   
SEDIMENTARY ROCKS
Breccia
Breccia
Chert
Chert
Anthracite Coal
Coal
Conglomerate
Conglomerate
Dolomite
Dolomite
Flint
Flint
Hematite Iron Ore
Iron Ore
Limestone
Limestone
Oil sand
Oil Sand
Oil shale
Oil Shale
Halite Rock Salt
Rock Salt
Sandstone
Sandstone
Shale
Shale
Siltstone
Siltstone
   



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