Composed of Quartz, Feldspar, and Mica.
"Two Expeditions into the Interior of Southern Australia, Volume I" by Charles Sturt
Thus he formed, for instance, pumice-stone, feldspar, mica, iron pyrites, &c. artificially.
"Familiar Letters of Chemistry" by Justus Liebig
Sienite and feldspar succeeded in our descent to the snow line, where we found a feldspathic granite.
"The Life and Adventures of Kit Carson, the Nestor of the Rocky Mountains, from Facts Narrated by Himself" by De Witt C. Peters
Feldspar, rock grains called, 63.
"Conservation Reader" by Harold W. Fairbanks
It is estimated that the feldspars make up 50 per cent of all the igneous rocks and 16 per cent of the sedimentary rocks.
"The Economic Aspect of Geology" by C. K. Leith
Similarly opal, moonstone, and turquoise are of about the same hardness as feldspar and are all rated 6.
"A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public" by Frank Bertram Wade
When flint and feldspar are used, they are ground fine at the quarry.
"Makers of Many Things" by Eva March Tappan
If sienite, very hard, the quartz element predominating, as the feldspar does farther north.
"The Atlantic Monthly, Volume 15, No. 91, May, 1865" by Various
What does feldspar rock yield?
"The Elements of Agriculture" by George E. Waring
Granite is made of quartz, feldspar, and mica, sometimes with added particles of hornblende.
"Earth and Sky Every Child Should Know" by Julia Ellen Rogers
Imerys has signed a final agreement regarding its acquisition of The Feldspar Corp. A subsidiary of Zemex Corp. That includes its feldspar and kaolin activities.
In 2007, The Feldspar Corp.
Has introduced a potash crystalline feldspar mineral compound that is transparent to ultraviolet light.
Sunstone , the plagioclase feldspar mineral has attractive inclusions like hematite that lend a sparkly effect to the cut gemstones.
Obtained by the Chemistry and Mineralogy (CheMin) experiment on NASA's Curiosity rover, these data reveal crystalline feldspar, pyroxenes and olivine mixed with some amorphous (non-crystalline) material.
Polymerization on internal, organophilic silica surfaces of dealuminated zeolites and feldspars.
Field-control, phase-transitions, and life's emergence
These species should be depleted into feldspars in the presence of silicates; their presence requires the sequestration of condensates to deeper levels1 (Burrows et al. 2000).
Cloud Formation and Dynamics in Cool Dwarf and Hot Exoplanetary Atmospheres