Rock Photos

There is a fair amount of variety within each category, so I have tried to include a representative sample of each group.

 

Extrusive Igneous Rocks (volcanic)
pieces of pumice lava rocks
notice how both sets of samples above contain bubbles while the samples below are glassy
volcanic glass (obsidian)

Intrusive Igneous Rocks

A variety of rocks made up of visible crystals (like granite)

all of the intrusive igneous rocks are made up entirely of visible minerals

Sedimentary Rocks
Rock samples containing small rounded pebbles Rock samples made of sand.
The samples above contain pebbles. The samples above are made of sand.
rock samples made entirely of sea shells rock samples containing fossils
Both of the sets of samples above contain sea shells or fossils.
sample of rock made of mudmud

Metamorphic rocks
flattened and foliated metamorphic rock flattened and foliated metamorphic rock
The samples above are flattened and show the evidence of pressure.  Some samples are folded, but no photos are available.