$7.95
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Feldspars are common minerals in rocks, making up around 41% of the Earth's crust. There are many types and subtypes of feldspar. The supplier doesn't specify the mesh, but it's probably 200.
This is a "soda spar", widely used in ceramics (and in other areas) for both clay bodies and glazes. This specific sodium feldspar is listed in the Digital Fire ceramics materials database { https://digitalfire.com/4sight/material/minspar_200_1031.html }:
"A 200 mesh flotation-grade soda feldspar from Spruce Pine, NC. Used in the ceramic whiteware industry for sanitary ware, dinnerware, floor and wall tile, artware and glazes.
Formerly called NC-4 Feldspar. Very similar chemistry to the no-longer-available F-4 feldspar."
About felspar in general, Digital Fire { https://digitalfire.com/4sight/mineral/ceramic_mineral_feldspar_118.html } says this:
"An indispensable material in the ceramic industry. Most ceramic bodies employ feldspar as a flux to vitrify them at a lower temperature (the feldspar creates a glaze that glues the more refractory particles together to form the fired matrix). Most medium and high temperature glazes employ it as a flux. Feldspars are naturally occurring crystalline rocks that will melt and cool to form a glass (nature cooled them slowly (devitrified) to for crystalline minerals. There are many kinds of feldspars, but in ceramics soda, potash and lime feldspars are the most common.
Porcelains can contain up to 50% feldspar, stoneware bodies around 15%. Feldspar sources K2O and Na2O to glazes, these can produce very brilliant results. However, the high KNaO produces a high thermal expansion which in turn produces crazing. Thus it is important to control the amount of feldspar and employ materials that source other low expansion oxides like CaO, MgO, Li2O, BaO, SrO, etc."
Wikipedia lists some other things feldspars are used for { https://en.wikipedia.org/wiki/Feldspar }:
"Feldspar is a common raw material used in glassmaking, ceramics, and to some extent as a filler and extender in paint, plastics, and rubber. In glassmaking, alumina from feldspar improves product hardness, durability, and resistance to chemical corrosion. In ceramics, the alkalis in feldspar (calcium oxide, potassium oxide, and sodium oxide) act as a flux, lowering the melting temperature of a mixture. Fluxes melt at an early stage in the firing process, forming a glassy matrix that bonds the other components of the system together. In the US, about 66% of feldspar is consumed in glassmaking, including glass containers and glass fiber. Ceramics (including electrical insulators, sanitary ware, pottery, tableware, and tile) and other uses, such as fillers, accounted for the remainder.
In earth sciences and archaeology, feldspars are used for K-Ar dating, argon-argon dating, and luminescence dating.
In October 2012, the Mars Curiosity rover analyzed a rock that turned out to have a high feldspar content."-
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Dec 1, 2022
Megan
Jan 30, 2021
gabriel
Jun 13, 2019
This arrived well packaged, timely and was what it was advertised to be. I bought this to experiment. I dissolved Ace Hardware toilet ring "wax" in turpentine (other thinners should work too), then mixed enough of this in to create a paste, which I used, with a soft cloth, to polish wood-acrylic turnings I designed and built. I think the diatomaceous earth mix gave a slightly better shine, but this would still work to get close to the final.
Kelly