http://www.minsocam.org/msa/collectors_corner/id/rock_key.htm
Identifying Rocks
Identifying rocks are based on observations. Identifying rocks is less critical in some ways than identifying minerals. A dense, gray mineral is either galena or it isn't. On the other hand, sandstone can grade into siltstone, limestone into dolostone, gabbro into diorite. If a rock is on the borderline between two types, it's usually not all that critical where you place it to name it.
Identifying rocks are based on observations. Identifying rocks is less critical in some ways than identifying minerals. A dense, gray mineral is either galena or it isn't. On the other hand, sandstone can grade into siltstone, limestone into dolostone, gabbro into diorite. If a rock is on the borderline between two types, it's usually not all that critical where you place it to name it.
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