FELDSPAR

Feldspar

Feldspars are a group of rock-forming tectosilicate minerals that make up as much as 60% of the Earth's crust.

The above text is a snippet from Wikipedia: Feldspar
and as such is available under the Creative Commons Attribution/Share-Alike License.

feldspar

Noun

  1. Any of a large group of rock-forming minerals that, together, make up about 60% of the earth's outer crust. The feldspars are all aluminum silicates of the alkali metals sodium, potassium, calcium and barium. Feldspars are the principal constituents of igneous and plutonic rocks.


The above text is a snippet from Wiktionary: feldspar
and as such is available under the Creative Commons Attribution/Share-Alike License.

Need help with a clue?
Try your search in the crossword dictionary!