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what is a good size feldspar mine

what is a good size feldspar mine

s slightly softer than quartz is very likely considered a feldspar. The main mineral that might be confused with feldspar is quartz. Besides hardness, the biggest difference is how the two minerals break. Quartz breaks in curvy and irregular shapes . Feldspar, however, breaks readily along flat faces, a property called cleavage. As you turn a piece of rock in the light, quartz glitters and feldspar flashes. Other differences: quartz is usually clear and feldspar...s enough to be able to tell the two main types of feldspar, plagioclase feldspar and alkali feldspar. The one thing about plagioclase that39;s usually different is that its broken facesits cleavage planesalmost always have fine parallel lines across them. These striations are signs of crystal twinning. Each plagioclase grain, in reality, is typically a stack of thin crystals, each with its molecules arranged in opposite directions. Plagioclase has a color range from white to dark gray, and it39;s typically translucent. Alkali feldspar has a color range from white to brick red, and it39;s typically opaque. Many rocks have both feldspars, like granite. Cases like that are helpful for learning to tell the feldspars apa...s tetravalent. Aluminum makes three bonds , calcium makes two and sodium and potassium make one . So the identity of Xdepends on how many bonds are needed to make up the total of 16. One Al leaves one bond for Na or K to fill. Two Al39;s leaves two bonds for Ca to fill. So there are two different mixtures that are possible in the feldspars, a sodium potassium series and a...s specific gravity is 2.62, anorthite39;s is 2.74, and the others fall in between.) The really precise way is to use thin sections to determine the optical properties along the different crystallographic axes. The amateur has a few clues. An iridescent play of light can result from optical interference inside some feldspars. In labradorite, it often h...

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