How would a geologist observe when studying a rock?
    1.    color
    2.    texture
    3.    mineral composition

Texture (look & feel of the rocks surface)
    terms based on the size, shape, and patterns of grains
1.    grain size
2.    grain shape
3.    grain pattern
4.    no visible grain

Left side
Use a magnifying lens to observe each of the following rock samples.
Metamorphic Rocks
Slate - fine grained crystals
Diorite - foliated
Quartzite - non foliated
Graphite Schist - foliated

Sedimentary Rocks
Red Sandstone -
Limestone (Micrite) -
Breccia - jagged grain
Shale - thin, flat layers
Flint - no visible grain
Diatomite (diatomaceous earth) -

Igneous Rocks
Obsidian -
Granodiorite Porphyry - large crystals
Granite - coarse grained crystals
Rhyolite - fine grained crystals (2 colors)
Basalt -