A gradual decrease between geologic horizons
A gradual decrease between geologic horizons
An ore of niobium, FeNb2O6
An line on a map or chart used to depict topography and surface
Mining claims that have a common side or boundary
The movement of rocks by the intrusion of another rock
The point at which 2 distinct rock types meet
The genetic association between igneous rocks derived from the same parent magma
Sedimentary rock consisting of rounded pebbles cemented into a solid mass
A crushing machine using a tapered gyrating cylinder revolving on its axis within an outer chamber
A compacted mass of mineral matter