Feldspar
Overview
Feldspar is by far the most abundant group of minerals
in the earth's crust, forming about 60% of terrestrial
rocks. Amongst the numerous rocks in which they are present,
feldspars are particularly abundant in igneous rocks like
granite, which contains up to 50% or 70% of alkaline feldspar.
Most deposits offer sodium feldspar as well as potassium
feldspar and mixed feldspars. Chemically, the feldspars
are silicates of aluminium, containing sodium, potassium,
iron, calcium, or barium or combinations of these elements.
Uses
Feldspars are primarily used in industrial applications
for their alumina and alkali content. Most of the products
we use on a daily basis are made with feldspar: glass
for drinking, glass for protection, fiberglass for insulation,
the floor tiles and shower basins in our bathrooms, and
the tableware from which we eat. Feldspars play an important
role as fluxing agents in ceramics and glass applications,
and also are used as functional fillers in the paint,
plastic, rubber and adhesive industries. Feldspars are
also used in the ceramic industries, in enamel frits and
glazes, welding electrodes, latex foam, road aggregate,
urethane, and mild abrasives.
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