The ingredients in alkaline glazes are soda-ash, whiting, feldspar, flint and oxide of tin.
Granite is made of quartz, mica, and feldspar, as has been said before.
Pick up a handful of gravel and you will be able to find much of it feldspar or other mineral containing some ten per cent.
feldspar as an abrasive is used mainly in scouring soaps and window-wash.
It had been taken away with a feldspar to the china factory, and only when there was no more to be got, man had stayed away.
I do hope I 'll get one with feldspar in it, or something nice and interesting.
We knew that the place was ugly and sinister, but feldspar and augite didn't give it that look.
When flint and feldspar are used, they are ground fine at the quarry.
The appearance of the rock is not modified by the amount of feldspar which it contains.
According to the color of the feldspar the rock may be red, or pink, or gray.
Any of a group of abundant monoclinic or triclinic minerals having the general formula MAl(Al,Si)3O8, where M is either potassium (K), sodium (Na), or calcium (Ca) or less commonly barium (Ba), rubidium (Rb), strontium (Sr), or iron (Fe). Feldspars range from white, pink, or brown to grayish blue in color. They occur in igneous, sedimentary, and metamorphic rocks and make up more than 60 percent of the Earth's crust. When they decompose, feldspars form clay or the mineral kaolinite.