— feldspar, any of a group of aluminosilicate minerals that contain calcium, sodium, or potassium. Feldspars make up more than half of Earth's crust, and professional literature about them constitutes a large percentage of the literature of mineralogy.

 — These companies quarry, fabricate or restore the stones. They employ all of the most modern manufacturing processes to insure that the stones can be used for interior, exterior and decorative use. One of the main priorities of Consortium Lapis is to promote the consistency of color found in Sicilian stones as well as the technical qualities of ...

Almost all of the feldspar production in the United States is from quarries in North Carolina, Idaho, California, ia, Oklahoma and South Dakota. These locations produce enough feldspar to supply nearly all of the nation's consumption. The resource available for future production is enormous.

 — Feldspar is one of the most common minerals found in the Earth's crust, and it forms some really fascinating varieties. Amazonite, orthoclase, and microcline are great examples of the types of feldspar, each with their own unique appeal and characteristics.

 — The Pirrera or Quarry of Sant'Antonio opens up at the foot of the cliff of the same name, a rock face of the Milazzian age that marks the north and east edge of the Hyblean limestone plateau, on which the town of Melilli is built.

Arnold O. Tanner, mineral commodity specialist for the U.S. Geological Survey, compiled the following information on feldspar, one of the most abundant and widespread rock-forming mineral groups on Earth. Feldspar in granite on a beach in Portugal.

 — Weathering of feldspars plays an important role in soil formation especially for increasing soil fertility for food production. The geological processes such as tectonism, volcanism, glaciation...

 — Overview of physical properties, chemistry, structure, occurence and mineralogy of feldspar. Description of major members like anorthite, albite, plagioclase, orthoclase, sanicine and microcline.

 — If you were to ask a layman about Italy's stone industry, they would likely tell you about Michelangelo's white marble quarries in Carrara or the rich stoneworking tradition in Verona. However, off the mainland, the island of …

 — Feldspar alteration (including the whole processes of feldspar dissolution, transfer of released solutes, and secondary mineral precipitation) is ubiquitous and important in fields including resources and environmental sciences.