make a dichotomous key using these rocks: rhyolite granite andesite diorite basalt gabbro peridotite obsidian scoria pumice tuff sandstone shale conglomerate coal halite gypsum chert coquina slate mica schist gneiss marble quartz

make a dichotomous key using these rocks: rhyolite granite andesite diorite basalt gabbro peridotite obsidian scoria pumice tuff sandstone shale conglomerate coal halite gypsum chert coquina slate mica schist gneiss marble quartzite Phyllis migmatite

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