Quick Answer: What Is Igneous Rock And Example?

Who discovered igneous rocks?

The rock was described by Moore and Hayness (1920, pp.

183-187) and they gave credit for its discovery to T.

S.

Harrison of Denver, Colo.

The rock is an igneous breccia or aglomerate comprising a ground-mass of basalt and inclusions consisting principally of shale in various stages of alteration..

How can you distinguish between igneous and metamorphic rocks?

Look for crystals in igneous rocks. Examples of igneous rocks are gabbro, granite, pumice and obsidian. Metamorphic rocks are rocks that have become changed by intense heat or pressure while forming. One way to tell if a rock sample is metamorphic is to see if the crystals within it are arranged in bands.

What are the textures of igneous rocks?

Igneous textures are used by geologists in determining the mode of origin igneous rocks and are used in rock classification. There are six main types of textures; phaneritic, aphanitic, porphyritic, glassy, pyroclastic and pegmatitic.

What are igneous rocks give examples?

Rock.Granite.Pumice.Felsic and mafic rocks.Basalt.Perlite.Rhyolite.Trachyte.More items…•

What does an igneous rock look like?

These coarse-grained crystals make the rock look sugary as the flat crystal faces reflect the light in hundreds of little sparkles. The name of the igneous rock depends on what minerals are present. If there are lots of light-colored minerals and the rock is coarse grained, it is granite.

Where are igneous rocks used?

Igneous rocks have a wide variety of uses. One important use is as stone for buildings and statues. Diorite was used extensively by ancient civilizations for vases and other decorative artwork and is still used for art today (Figure 1). Granite (figure 2) is used both in building construction and for statues.

Why are igneous rocks important?

Igneous rocks are also very important because their mineral and chemical makeup can be used to learn about the composition, temperature and pressure that exists within the Earth’s mantle. They can also tell us much about the tectonic environment, given that they are closely linked to the convection of tectonic plates.

What is another name for igneous rocks?

Igneous rocks are also known as magmatic rocks. Igneous rocks are divided into two types: plutonic and volcanic rock. Plutonic rock is another name…

What are three examples of sedimentary rock?

Common sedimentary rocks include sandstone, limestone, and shale. These rocks often start as sediments carried in rivers and deposited in lakes and oceans. When buried, the sediments lose water and become cemented to form rock. Tuffaceous sandstones contain volcanic ash.

What are the 3 main types of igneous rocks?

When molten rock, or melted rock, solidifies, igneous rocks are formed. There are two types of igneous rocks: intrusive and extrusive….Extrusive Igneous Rocksandesite.basalt.dacite.obsidian.pumice.

What is the main difference between igneous and metamorphic rocks?

1. Igneous rocks are formed when magma (or molten rocks) have cooled down and solidified. Sedimentary rocks are formed by the accumulation of other eroded substances, while Metamorphic rocks are formed when rocks change their original shape and form due to intense heat or pressure.

What is an igneous rock?

Igneous rocks (from the Latin word for fire) form when hot, molten rock crystallizes and solidifies. … Igneous rocks are divided into two groups, intrusive or extrusive, depending upon where the molten rock solidifies.

Which is the best example of an igneous rock?

Igneous Rocks: Examples and UsesGranite.Basalt.Pumice.

How can you identify igneous rocks?

Cooling of the magma can occur beneath the surface (plutonic) or on the surface (volcanic). Igneous rocks can be identified by the determination of the composition and texture of the rock. Once these two characteristics have been identified, the Igneous Rock Identification chart is used to identify the rock name.

What are the common igneous rocks?

Most Common Types of Igneous RocksTypes. There are two kinds of igneous rocks. … Granite. Granite is a medium to coarse-grained igneous rock that is formed intrusively. … Basalt. Basalt is one of the most common types of igneous rocks in the world. … Gabbro. Crushed gabbro is commonly used as concrete aggregate, railroad ballast and road metal. … Pumice.

What are five examples of igneous rock?

These rocks include andesite, basalt, dacite, obsidian, pumice, rhyolite, scoria, and tuff. Pictures and brief descriptions of some common igneous rock types are shown on this page.

What are the three kinds of rock?

There are three main types of rocks: sedimentary, igneous, and metamorphic. Each of these rocks are formed by physical changes—such as melting, cooling, eroding, compacting, or deforming—that are part of the rock cycle. Sedimentary rocks are formed from pieces of other existing rock or organic material.

What minerals are in igneous rocks?

These silicate minerals include feldspars (plagioclase feldspar, potassium feldspar), quartz, micas (muscovite, biotite), pyroxenes (augite), amphiboles (hornblende), and olivine. These minerals make up over 95% of the volume of the common igneous rocks, making igneous rocks easy to identify.