Texas Rocks and Minerals

Earth's outer crust
Geologists
Time and rock units
Geologic map
What are rocks and minerals?
Chemical elements
Minerals
Rocks
Igneous rocks
Extrusive or volcanic igneous rocks
Intrusive igneous rocks
Sedimentary rocks
Soils
Sedimentary rock materials in broken fragments
Sedimentary rock materials in solution
Cementing materials and chemical sediments
Sedimentary rocks formed by plants and animals
Metamorphic rocks
Static metamorphism
Contact metamorphism
Dynamic metamorphism
Occurrence and properties of minerals
How minerals occur
Crystalline minerals
Crystals
Imperfect crystals
Amorphous minerals
Some distinguishing properties of minerals
Color
Luster
Transmission of light
Hardness
Streak or powder
Cleavage
Parting
Fracture
Specific gravity
Effervescence in acid
Some special occurrences of minerals
Cave deposits
Concretions
Geodes
Petrified wood
Collecting rocks and minerals
Rock and mineral identification charts
How to use the mineral identification charts
Key to mineral identification charts
Mineral identification charts
How to use the rock identification charts
Rock identification charts
Descriptions of some Texas rocks and minerals
Anhydrite
Asbestos
Barite
Basalt
Calcite
Cassiterite
Celestite
Cinnabar
Clay
Copper minerals (chalcocite, chalcopyrite, malachite, azurite)
Dolomite
Feldspar
Fluorite
Galena
Garnet
Gneiss
Gold
Granite
Graphite
Gypsum
Halite
Hematite
Limestone
Limonite
Llanite
Magnetite
Manganese minerals (braunite, hollandite, pyrolusite)
Marble
Mica
Obsidian and vitrophyre
Opal
Pegmatite
Pyrite
Quartz
Quartzite
Rhyolite
Sand and sandstone
Schist
Serpentine
Shale
Silver minerals (argentite, cerargyrite, native silver)
Sulfur
Talc and soapstone
Topaz
Tourmaline
Uranium minerals (carnotite, uranophane, pitchblende)
Volcanic ash (pumicite)
Composition, hardness, and specific gravity of some Texas minerals
Books about rocks and minerals
Nontechnical books for beginners
Textbooks and other reference books
Selected references on Texas rocks and minerals