Igneous rocks

Rocks do not have a definite composition of mineral constituents. Feldspar and quartz are the most common minerals found in rocks. There are many different kinds of rocks which are grouped under three families on the basis of their mode of formation.

Trap rock is a construction industry term for dark-colored igneous rocks such as basalt, gabbro, and diabase that are used to make crushed stone.

Illustrated overview and examples of igneous rocks: basalt, granite, obsidian, pumice, gabbro, porphyry...

It is obsidian rock which is a extrusive igneous rock and it shows holohyaline texture which is a glassy from outside and it forms at the…

List of all Igneous, Sedimentary, and Metamorphic Rock Types with Pictures and Links to Specific Articles about each Type of Rock.

Learn about igneous rocks in geology, including their origin, properties, and classification. Get examples and identification tips.

The three main types of geological rocks are described. They are...

Porphyritic granite sample approximately 1" (3cm) in size Large crystals in a variety of shapes and colors make this felsic plutonic rock ideal for lessons in mineral identification and bulk rock chemistry Perfect size for use in classroom identification labs and exercises, correlates well to Next Generation Science Standards Evidence Statements Great for comparing cooling rates between samples with differently-sized crystals Specimen comes in clear labeled and barcoded bag for ideal storage

Igneous Rock-Peridotite « Sandatlas- Dunite (almost entirely made of olivine mineral crystals) from Lanzarote~gorgeous!