The pages that follow contain descriptions of Texas rocks and minerals.
The descriptions are given in alphabetical order, except that related
varieties are described together. For example, agate, amethyst, chert,
flint, jasper, onyx, and chalcedony are discussed under quartz, because
they are varieties of quartz. The descriptions include the properties of
the rock or mineral that will help you identify it and also include
information on where the rock or mineral can be found in Texas, some of
its uses, and how it may have formed. The chart on page 99 lists
chemical composition, specific gravity, and hardness of various Texas
minerals.
Agate. _See_ Quartz.
Agatized Wood. _See_ Quartz.
Alabaster. _See_ Gypsum.
Albite. _See_ Feldspar.
Almandite. _See_ Garnet.
Amethyst. _See_ Quartz.
Amphibole Asbestos. _See_ Asbestos.