A breccia composed of volcanic rock fragments
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Category: <span>A</span>
Materials sliding inwards or moving concavely inside of a break
A geophysical survey performed with a magnetometer aboard, or towed behind, an aircraft
An instrument aboard, or attached to, an airplane used to detect the strength of a magnetic field
A sodium-ferric monoclinic iron silicate, NaFe3+Si2O6, which occurs in soda-rich igneous rock
A horizontal opening driven into a hill or mountain for providing access to minerals
Having a diamond-like luster, and or hardness
Places in a mine that are ventilated and regularly inspected
A fault prone to movement
Material originating elsewhere. Not country rock