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A broken surface with concentric, raised surface markings looking similar to the ridges on a seashell (see also fracture).
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).
the basic unit of the structure of silicate minerals; a silicon ion chemically bonded to and surrounded by four oxygen ions
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