Igneous Rocks

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Igneous rock is shaped via the cooling and solidification of magma or lava. The magma may be derived from partial melts of existing rocks in both a planet’s mantle or crust.

Volcanic Bomb

Volcanic bomb is pyroclastic rock that is a cooling of a mass of lava it flies thorough the air after eruption. If it is...


Agglomerate is a pyroclastic coarse accumulation of blocks of volcanic metarial that contains atl least 75% bombs, rounded clasts in a matriix of lava...
Phenotrachytic welded tuff


Tuff is relatively soft and porous rock that made of ash and other sediments from volcanic vents that has solidified into the rock. After...


Scoria is vesicular and dark colored igneous rock that have or have not contain any crystals.  It is typically dark color, such as dark...


Pumice is a volcanic rock that consists of highly vesicular rough textural rock glass. It generally light colored. It is created when gas-saturated liquid...
Camptonite lamprophyre (Mesozoic, 100-200 Ma; Campton Falls, Grafton County


Lamprophyre is ultrapotassic igneous rock that is occurring as dikes, lopoliths, loccoliths, stocks and small intrussion. It is alkaline silica-undersaturated mafic or ultramafic rocks...


Kimberlite is an igneous rock that major source of diamonds. Kimberlite is a variety of peridotite.  It is rich in mica minerals content and...
Pyroxenite (Stillwater Complex, Neoarchean)


Pyroxenite is an ultramafic igneous rock that contain pyroxene group minerals such as augite, diopside, hypersthene, bronzite or enstatite. This is a coarse-grained rock...
Alkaline Pegmatite Rock have large crystal size minerals in it.


Pegmatite is an igneous rock that form end of the stage a magma’s crystallization. Pegmatites contain exceptionally large crystals and they contain rarely minerals than other types of rocks. They have interlocking crystals usually larger than 2.5 cm in size. Generally most Pegmatites are found in sheets of rock that are dikes and veins Also near large masses of igneous rocks called batholiths.


Diorite is coarse – grained intrusive igneous rock that commonly mineralogy is plagioclase feldspar and dark colored minerals such as hornblende and biotite.It usually occurs dikes, sills and intrusions with continental crust . Diorite is usually grey to dark-grey in colour, but it can also be black or bluish-grey, and frequently has a greenish cast.


Obsidian is an igneous rock that forms when molten rock material cools so rapidly that atoms are unable to arrange themselves into a crystalline structure. It is an amorphous material known as a "mineraloid." The result is a volcanic glass with a smooth uniform texture that breaks with a conchoidal fracture .


The most common intrusive rock in Earth’s continental crust, granite is familiar as a mottled pink, white, gray, and black ornamental stone. It is coarse- to medium-grained. Its three main minerals are feldspar, quartz, and mica, which occur as silvery muscovite or dark biotite or both. Of these minerals