によって Katie KL Lycett 3年前.
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Chert
Rhyolite
Small spotted grains
Diabase
Large spotted grains
Andesite
Hardness
Can be scratched by a penny
Slate
Can not be scratched by a penny
Basalt
Obsidian
Grey
Shale
Schist
Limestone
Quartzite
Salt and pepper appearance
Gabbro
Pebbles
Conglomerate
Larger spotted grains
Pegmatite
Smaller spotted grains
Granite
White
Black/grey layers
Marble
Dolostone
Brown
Visible darker layers
Gneiss
No visibly darker layers
Sandstone