Rocks

At today's level of consumption, the average newborn infant will need a lifetime supply of 800 pounds of lead, 750 pounds of zinc, 1,500 pounds of copper, 3,593 pounds of aluminum, 32,700 pounds of iron, 26,550 pounds of clays, 28,213 pounds of salt, and...
An intrusive igneous rock made of plagioclase feldspar and amphibole and/or pyroxene. Similar to gabbro only not as so dark, and containing less iron and magnesium.'Salt and Pepper' Rock:Diorite is of intermediate composition. It is called 'salt and...
Gneiss is a coarse-grained, foliated metamorphic rock that commonly has alternating bands of light and dark-colored minerals. 
A rock is an aggregate of one or more minerals; or a body of undifferentiated mineral matter.