Walter Schumann has written:

'Rocas y Minerales'

'Stones and Minerals of the World'

'Handbook of rocks, minerals, and gemstones' -- subject(s): Identification, Handbooks, manuals, Precious stones, Minerals, Rocks

'Edle Steine'

'Stones and minerals' -- subject(s): Determinative Mineralogy, Mineralogy, Determinative, Paleontology, Rocks

'Steine & Mineralien' -- subject(s): Determinative Mineralogy, Mineralogy, Determinative, Paleontology, Rocks

minerals

John Sinkankas has written:

'Gem Cutting a Lapidarys Manual Edition'

'Gemstone & mineral data book' -- subject(s): Gem cutting, Handbooks, manuals, Mineralogy

'Prospecting for gemstones and minerals' -- subject(s): Mineralogy, Precious stones

'Emerald and other beryls' -- subject(s): Beryl, Emeralds

'Beryl' -- subject(s): Beryl

'Gemstones of North America (v. 2: Gemstones of the world series)'

'Van Nostrand's standard catalog of gems' -- subject(s): Catalogs, Collection and preservation, Gems, Precious stones

'Mineralogy for amateurs' -- subject(s): Mineralogy

'Field Collecting Gemstones and Minerals' -- subject(s): Collection and preservation, Minerals, Precious stones

Rocks are very important to the economies of the countries where they are located. They are the source of many minerals and gemstones.

Yes. Technically rocks contain minerals. These minerals may incluse metals and gemstones. We can use these for decoration or for industrial purposes.