A nonmetallic mineral element. Symbol, P
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Category: <span>P</span>
The residual emission of absorbed energy in the form of light by a substance, following exposure to incident radiation
A mineral containing phosphorous
A term for igneous rocks having a texture of grainy crystal visible to the naked eye
The sum of homogenous material within a larger heterogeneous material body
The period 280 to 245 million years ago, followed by the Mesozoic era. Known as the age of amphibians
The replacement of minerals in organic matter by calcareous, carbonaceous or siliceous minerals, which serve to solidify and preserve the form of the matter beyond its organic state
A depth of the earths surface or subsurface which is permanently frozen.
Intrusive igneous rock formed within olivine, the source of Peridot
A solid block of rock used to support a mine shaft