A sodium-ferric monoclinic iron silicate, NaFe3+Si2O6, which occurs in soda-rich igneous rock
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Category: <span>A</span>
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
A monoclinic mineral with prismatic cleavage, 2[Ca2(Mg,Fe)5Si8O22(OH)2]
A strongly basic substance, such as a carbonate or hydroxide of an alkali metal
A series of elements, all of which are radioactive with atomic numbers greater than 88
A triclinic mineral, NaAlSi3O8; a member of the plagioclase and the alkali feldspar series having prismatic cleavage; a common rock-forming mineral in felsic igneous rocks