minerals that contain combinations of carbon and oxygen in their chemical structure.
the tendency of a mineral to break along preferred planes
A broken surface with concentric, raised surface markings looking similar to the ridges on a seashell (see also fracture).
a rock formed by the solidification of a substance
the flat surface of an euhedral mineral grain
the general shape of a crystal or cluster of crystals that grew unimpeded
the orderly framework within which the atoms or ions within a crystal
the internal arrangement of atoms or ions within a crystal
a smooth surface (as of a bone or cut gemstone)
art highly prized for its beauty or perfection
(mineralogy) a hollow rock or nodule with the cavity usually lined with crystals
a measure of how easily a mineral can be scratched
the visual property of something that shines with reflected light
solid homogeneous inorganic substances occurring in nature having a definite chemical composition
the branch of geology that studies minerals: their structure and properties and the ways of distinguishing them
Mohs hardness scale
a scale ranking ten minerals from softest to hardest; used in testing the hardness of minerals
One of two or more alternative possible crystal structures for a single chemical compound; for example, the minerals quartz and cristobalite are polymorphs of silica (SiO2).
a mineral that contains a combination of silicon, oxygen, and one or more metals
the basic unit of the structure of silicate minerals; a silicon ion chemically bonded to and surrounded by four oxygen ions
the density of a substance relative to the density of water
a marking of a different color or texture from the background
having the same shape, size, and position on both sides of a dividing line