Looking at the rock cycle through pottery
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Looking at the Rock Cycle Through Pottery. Review Questions:. What is a rock? What is a mineral? How do igneous rocks form? How do sedimentary rocks form? How do metamorphic rocks form?. Mineral Soil Types. What is sand? Made primarily of quartz (SiO2)

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Review questions
Review Questions:

  • What is a rock?

  • What is a mineral?

  • How do igneous rocks form?

  • How do sedimentary rocks form?

  • How do metamorphic rocks form?


Mineral soil types
Mineral Soil Types

  • What is sand?

    Made primarily of quartz (SiO2)

    Defined by a relatively LARGE particle size of 2mm-0.062mm

    • What is silt?

      Mineral soil

      Defined by a MEDIUM particle size 0.062mm-0.0039mm

    • What is Clay?

      Particle size is SMALL; less than 0.0039mm

      Most clay is made of silicon tetrahedrons that are glued together with Fe, Na, K or water

      Outer layer has a negative net charge; thus attracts a lot of positive cations like K and N


Clay particles magnified under an electron microscope
Clay Particles Magnified under an Electron Microscope

If a grain of sand were the size of a basketball, then a piece of silt would be the size of a marble, and a particle of clay would be a pinpoint. Clay particles are tiny, less than one 12,500th of an inch.




A clay filled tobacco field

10 miles from the Jones Pottery


Does clay fired in kilns transform into an igneous rock or a metamorphic rock
Does clay fired in kilns transform into an igneous rock or a metamorphic rock?

How can we answer this question? What information do we need?

Top temperature of the kiln is 1260° C (2300° F)

Partial melting begins at 800° C (1472° F)


What is a primary ingredient in the glazes that coat the outside of pots
What is a primary ingredient in the glazes that coat the outside of pots?

  • Think about how the outside of glazed pots compares to the outside of unglazed pots

  • Watch what happens to glazes and GLASS during video.

  • glass = Na (a flux) + SiO2


Pottery and the rock cycle
Pottery and the outside of pots?rock cycle

The clay particles that are fired undergo a metamorphism. Under intense heat, they partially melt and form something else altogether.

Glazes that are painted on the pot completely melt. They are made largely of glass, so they are lowest on Bowen’s Reaction series and melt most easily.


The Firing outside of pots?


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