(1) The tendency of a mineral to break along preferred planes; (2) a type of foliation in low-grade metamorphic rock.
Smoothly curving, clamshell-shaped surfaces along which materials with no cleavage planes tend to break.
A single, continuous piece of a mineral bounded by flat surfaces that formed naturally as the mineral grew.
A cavity in which euhedral crystals precipitate out of water solutions passing through a rock.
In mineralogy, hardness refers to the resistance of a mineral to scratching; a harder mineral can scratch a softer mineral.
A homogenous, naturally occurring, solid inorganic substance with a definable chemical composition and an internal structure characterized by an orderly arrangement of atoms, ions, or molecules in a lattice. Most minerals are inorganic.
Mohs hardness scale
A list of ten minerals in a sequence of relative hardness, with which other minerals can be compared.
Two minerals that have the same chemical composition but a different crystal lattice structure.
Minerals composed of silicon-oxygen tetrahedra linked in various arrangements; most contain other elements as well.
The basic building block of silicate minerals; it consists of one silicon atom surrounded by four oxygen atoms.
A number representing the density of a mineral, as specified by the ratio between the weight of a volume of the mineral and the weight of an equal volume of water.