A sedimentary rock comprised chiefly of hydrated calcium sulphate. CaSO4·2H2O
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Category: <span>G</span>
A metamorphic rock consisting of usually finely banded crystalline layers
A yellow to orange oxide of uranium
Abrasions on rocks, minerals or landscape caused by the movement of glaciers and glacial material
An arrangement of supplying, equipping or aiding a prospector in exchange for a percentage of a discovery, contingent upon the success of the prospector
A system of navigation that works based on a series of 25 or more satellites orbiting the earth, where at least 3 or more satellites are used to triangulate an exact location of its receiving units
The process of collecting dense placer material by a series of riffles placed in a stream of water
Rocks and minerals transported through the meltwater of glaciers
A large screen, sieve or mesh structure used for the process of grading rocks and gravels by size
General terms applied to altered, basaltic igneous rock coloured Dark green by chlorite, actinolite or epidote