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Naturally occurringSolidInorganicCrystalline formDefinite chemical composition
LusterHardnessStreakColorCrystal Cleavage/FractureOther
Field Test•Try to scratch with Fingernail - if so, 2.5
if not, •Try to scratch with Copper Penny – if so, 3
if not, •Try to scratch withSteel Nail – if so, 5
if not, •Try to scratch withGlass Plate – if so, 5.5
if not,•Try to scratch with Streak Plate – if so, 7.5 if not, > 7.5
Scratch a mineral with either another mineral or field test materials. The harder mineral will leave a mark or cut into the softer mineral.
Rub the mineral across the porcelain plate. The color left behind is the streak. Nonmetallic minerals and those that have a hardness greater than the streak plate will leave either white or no streak.
Fracture
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Crystal (galena) (pyrite) (fluorite) (quartz) Twinning(staurolite)
Fluorescense (fluorite)HCl Acid Reaction (calcite)Heft (galena)Magnetism (magnetite)Plasticity (mica)Smell (sulfur)Sound: actually a reaction to heat expansion
(sulfur)Taste (halite)Touch (talc) (graphite) (kaolonite)
