Other names/forms:Salt
Most distinguishing features:Has a salty taste. Cubic cleavage and hardness are indicative for the less brave geologists.
Other names/forms:Haematite
Most distinguishing features:Deep red streak and earthy lustre are indicative. SG may also be indicative.
Industrial/economical uses:Important ore or iron, sometimes used as a gemstone.
Most distinguishing features:Shining gray metallic lustre and deep-red streak are indicative.
Industrial/economical uses:Important ore of iron.
Most distinguishing features:Prominent striations, prismatic crystals and angle on cleavages is distinguishing.
Industrial/economical uses:Ornamental.