Cobblestone Series :

  A race contains the calcium, the sodium and the potassium aluminosilicate. For the earth's crust in the most common mineral, in the igneous rock, the metamorphic rock, the sedimetary rock all may appear. The feldspar is the nearly all igneous rocks essential mineral ingredient, has the vital significance regarding the rock classification.
  The feldspar isomorph substitution grows very much, their chemical composition commonly used OrxAby Anz (x + y + z = 100) expressed. Or, Ab and An separately on behalf of KAlS3O8, NaAlSi3O8 and CaAl2Si2O83 plant the component. Take some two components primarily, may divide as two isomorphs series: Alkalinity feldspar series (namely Or-Ab series); Plagioclase feldspar series (namely Ab-An series). Or and the An component only can very limitedly mix dissolves, does not form the series.
  The feldspar basic structure unit is a tetrahedron, it revolves a silicon atom or the aluminum atom by 4 oxygen atoms constitutes. Each such tetrahedron all and another tetrahedron altogether uses an oxygen atom, forms one kind of three dimensional skeleton. The big radius alkali or the alkali earth metal positive ion are located in the skeleton in the big crevice, 8 (in clinorhombic system feldspar) or 9 (in triclinic system feldspar).
  The feldspar crystal most assumes plate-type or along the board which some oneextends columnar. The dimorphism is extremely common,reaches 20 many kinds of. Common has the law, the Manny Pakistan law, the Pakistan warm promise law, the Qasba law, the Xiao law twin crystal. They separately exist in three slanting crystals or the monocline and three slanting crystals. Feldspar common cream color, but often because of includes the impurity to dye Cheng Huang, brown, the deep ash isochromatic, some also may have beautiful. Some two groups of perfect cleavages, its included angle 90° (clinorhombic system) or nearly to 90° (triclinic system). The proportion 2.56 ~ between 2.76, the An content advances along with the ingredient in advances, increases along with Or reduces. The mohs' scale is 6 ~ 6.5. Richly contains the potassium or the sodium feldspar mainly uses in the ceramic industry, the glass industry and the enamel industry; Includes rare element the and so on rubidium and cesium feldspar may take withdraws these elements the mineral raw material; The luster beautiful feldspar may take the decoration stone material and the semiprecious stone.