igneous rock

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What is quartz? Igneous rock

By | 2017-06-26T00:11:13+00:00 June 26th, 2017|Geology|

A chunk of white quartz Quartz is an igneous rock made out of molecules of silicon and oxygen atoms held together in a crystal pattern. All of the silica and oxygen that make quartz came originally from the insides of stars, and it shot out of the stars when the stars exploded as [...]

What are igneous rocks? Volcanic stone

By | 2017-06-26T00:06:08+00:00 June 26th, 2017|Geology|

Obsidian tools Igneous means "fiery", and igneous rocks are rocks that were made by heating them up in a fire. Usually that fire is the big fire inside the earth, under the earth's crust. Inside the earth, radioactivity creates very high temperatures of about 1000 degrees Celsius (that's about 1800 degrees Fahrenheit). Because [...]

What is Feldspar? Igneous rock

By | 2017-06-25T23:47:28+00:00 June 25th, 2017|Geology|

A feldspar quarry in India Feldspar is a very common igneous rock - more than half of the Earth's crust is made of feldspar. When molecules of aluminum, silica and oxygen get together with potassium, they combine to make the rock feldspar. Feldspar often combines with another rock called quartz to make a [...]

What is tin? Atoms, elements, chemistry

By | 2017-06-02T17:53:53+00:00 June 2nd, 2017|Chemistry|

Like the other metals, tin is one of the heavier kinds of atoms. Every atom of tin has 50 protons and 69 neutrons in its nucleus (depending on the isotope; the exact kind of tin). Like other metals, all tin atoms form inside older stars that have become supernovas. On Earth, tin is very common. [...]

What is kaolin clay? History of Art

By | 2017-05-25T10:46:41+00:00 May 25th, 2017|Art, China, Geology|

A chunk of kaolin clay Kaolin is a kind of clay with a lot of aluminum, silica, and oxygen in it. It is the kind of clay you use to make porcelain. Kaolin clay starts out as a kind of igneous rock called feldspar. When feldspar erodes in places that are hot and wet, [...]