Rocks play an important role in our life as many minerals are derived from them.
This specimen, from Upper Las Vegas Wash in Nevada, is probably a fault breccia.
It is a sign of special conditions in the geologic past.
Siltstone is much less common than sandstone or shale.
These specimens could be called puddingstone.
Bauxite is the principal ore of aluminum.
Bluestone pool decks are a popular use of this landscape stone.
It performs extremely well as a loose aggregate and is regularly used in a number of construction projects.