This is one of a series of pocket-sized guides on a range of subjects. Arranged
thematically for easy reference, each "Pocket" has been written by a subject
expert in a way that aims to make the information easily accessible to readers
aged 8 and up. The reference section at the back contains extra facts and
figures. This book covers rocks and minerals. From the rarest gems to the most
common rocks in the Earth's crust, it is a catalogue of minerals grouped by
colour for ease of identification.