(n) :
(geology, mineralogy) A mineral that formed by replacement of an existing mineral (or organic matter) such that the new mineral has the appearance and dimensions of the original.
(n) :
A deceptive, irregular, or false form; specifically:
(n) :
(geology, mineralogy) A mineral that formed by replacement of an existing mineral (or organic matter) such that the new mineral has the appearance and dimensions of the original.
(n) :
A deceptive, irregular, or false form; specifically: