feldspar

IPA: fˈɛɫdspɑr

(mineralogy) 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.

Examples of "feldspar" in Sentences

(Common orthoclase feldspar, which is frequently of a brownish pink or flesh color, will do.)
In the process of weathering, the softer, weaker minerals in granite (such as feldspar) are weathered away.
The name feldspar is a contraction of the longer name fieldspar, as some early specimens were found in fields.
Melters such as feldspar, whiting (or limestone) and talc are sufficient for the higher temperatures above 1200
There is also added some more fusible substance, such as feldspar, gypsum, or lime, together with some pure quartz.
Simple inspection will show that granite rock, for example, is a mixture of three minerals, called feldspar, mica, and quartz.
The rock here is a porphyritic granite (porhyritic meaning that the stone has large-grained crystals, such as feldspar or quartz, dispersed in a fine-grained feldspathic matrix or groundmass).
In other cases, quartz is the predominant material, and in still other cases, where the best kaolin is produced, the proportion of both quartz and mica are small, and the feldspar is the prevailing material.
Sand, the proppant, primarily quartz and feldspar aka ground up rock, is the material that gets lodged in cracks that open up, and keep those cracks open when force and pressure are removed, allowing less resistance between underground hydrocarbons, to allow them to become newly liberated hydrocarbons, which we use to power a significant portion of our country.