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	Medium grained. mainly consists of feldspar (about 90 per cent). dating back more than four billion years, anorthosite can show an iridescent display of colours, but in most cases they are white or light grey. this stone can also be found on the moon. the structure may be banded in grain size and texture.
Anorthosite

	Fine grained. the ash exploded out of a volcano may fall through the air and settle in beds, called ash falls when unconsolidated or ash falls tuffs when consolidated . The ash can vary in composition it may be called crystal tuff , vitric (glassy) tuff or lithic tuff (mostly rock fragments).Pyroclastic igneous rock ,highly susceptible to change , rapidly weathered.
Tuff

	Coarse grained. this is an agglomerate, these are formed by fragments of glass, rock or crystals,directly generated from explosive volcanic action, it may contain fragments torn from the sides of the volcano, as lava is ejected and cools in flight, the glassy exterior cracks with the sudden release of gases.
Volcanic bomb

	Fine grained. the basics of volcanic igneous rocks, these are found on earth and the moon, in abundance, dating back more than three billion years. when fresh out the ground it is a dark colour usually black but vary according to the mineral and chemistry presents.
Basalt

	Dacite is a term used by geologists for rocks which have between 63 and 69% silica content . it is more commonly medium grey . the main minerals are quartz and sodic plagioclase.
Dacite

	Coarse grained. hornblende biotite granite . the name is german meaning `to deceive` , alluding to the lack of valuable ores from the mineral . granites that weather to pure kaolin provide china clay .
Hornblende

	Coarse grained. an intrusive igneous rock . in composition similar to granite , but with less alkali feldspar , this means less reddish colours , but more greyish whites . this is the most common of igneous rocks .
Granodiorite

	Coarse graine. a mixture of white , pink or red alkali feldspar , glassy quartz , small amount of dark minerals , and sometimes white codic plagioclase. these are more common on high , rugged terrains .they are weather resistant and used on buildings.
Biotite granite

	Very coarse grained . very often light in colour , but a very distinctive rock . the same minerals are found in the more common igneous rock's , but pegmatite may contain some rare minerals also , these are mica , silica and gemstones these include emerald and topaz .
Pegmatite

	Very fine grain . containing 50 to 75% gas , this can make this pale grey , frothy volcanic glass , very light in weight , in fact certain types are so light they can even float . it can be used as a lightweight building material when cement is added , or more commonly used as an abrasive .
Pumice

	Very fine grained. when rhyolitic or dacitic lava either near or on the surface of the earth cools very fast . this makes a volcanic glass , which gives it that pitched resinous lustre apperance . they are also dark in colour , the more common are black , grey , brown or reds .
Pitchstone

	Glass like grain . rapid cooling has formed this rock into volcanic glass, with less than one per cent water, when it is fractured it leaves shell like rings, we call conchoidal.found in black, green, or red. it was once used for making weapons, due to its sharp edges.
Obsidian

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There are two types of igneous rock, these are intrusive and extrusive. Both are formed in different ways, when red hot molten magma cools and solidifies deep within the earth.
Intrusive igneous;
This type of rock are present when magma pushed towards the earths surface, but before it reaches, it cools and hardens.
Extrusive igneous;
This type of rocks are formed when magma errupts from a volcano. it starts as red hot molten lava, this then cools to form rocks such as basalt which is a very hard rock.