Opal
minerals
Magnetite
minerals
Staurolite “cross” in schist (square)
minerals, metamorphic,
Salts precipitated by evaporation of seawater
precipitation, halite, evaporites
Epidote mineralization in basalt.
crystals, alteration
Aragonite crystals (square)
minerals
Apatite crystal in calcite (square)
minerals
Halite crystals
minerals
Different colors of calcite
minerals, green, yellow, blue, clear
rhombic cleavage in calcite
minerals
Zonation in feldspar
felsic, orthoclase
Euhedral quartz crystals in vug
minerals
Different colors of calcite crystals
minerals
Kyanite crystals (vertical)
minerals
Topaz crystal
minerals
Galena crystals on dolomite
crystal habit, cubic, minerals
Streak plate and test
mineral identification