ColorVaries depending on the minerals present, can be black, white, gray, red, brown, green, etc.
TextureCan be smooth, rough, bumpy, porous, or glassy
ShapeIrregular or angular
SizeRanges from pebble-sized to boulder-sized
HardnessCan range from very soft (e.g. talc) to very hard (e.g. diamond)
DensityTypically ranges from 2.5 to 3.3 g/cm3
CompositionMade up of one or more minerals, organic materials, or other substances
WeightCan vary widely depending on size and composition