Quartz, felspar, and mica are found in pegmatite rocks, which are an important source of many critical minerals such as beryl, lithium, niobium, tantalum, molybdenum, tin, titanium, and tungsten.

More than 4,000 naturally occurring minerals—inorganic solids that have a characteristic chemical composition and specific crystal structure—have been found on Earth. They are formed of simple ...

Mica is naturally occurring in rocks but, when used as an aggregate, makes concrete weaker over time. The couple claim they have been advised their home will have to be demolished and rebuilt.

Mica is naturally occurring in rocks but, when used as an aggregate, makes concrete weaker over time. The couple claim they have been advised that their home will have to be demolished and rebuilt.