An accumulated mass of decayed or partially decayed plant matter
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Category: <span>P</span>
A small globular piece of fused metal or metals, usually 1 cm. in diameter
An igneous rock, similar to granite, having a coarse irregular texture. Pegmatites are a common host of minerals and specifically a priority target for well formed crystal minerals such as corundum and tourmaline
The formation of soil from the decomposition of organic matter
Any type of moss which has formed on peat as its substrate
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