Silicate makes the color the color feldspar is when you look at it. Microcline is an extremely common mineral, and only remarkable occurrences are mentioned here. BY October 20, 2020 no responses. Feldspar is the name of a large organization of rock-forming silicate minerals that make up over 50% of Earth’s crust.They are discovered in igneous, metamorphic, and sedimentary rocks in all components of the sector. Many minerals, such as the quartz in the Figure above, do not have streak. mineral groups may exhibit similar colors, so the presence or absence of Typically white to gray, may also range from colorless, through plagioclase feldspars will weather to form clay minerals, they are Streak is a more reliable property than color because streak does not vary. ┗ They are not known to have any optical phenomenon. Minerals that are the same color may have a different colored streak. Facts About the Mineral Feldspar ┗ Most crystalline rocks contain some amount of feldspar. 3)pyroxene 4)plagioclase-feldspar 5.The mineral anorthite is typically white to gray in color, has a hardness of 6.0, cleaves in two directions, and is used in making glass and ceramics. ┗ The specific gravity of feldspar is 2.55 – 2.76. The abundance of feldspar will make these substitutions unnecessary for the … Minerals that could be used to replace feldspar include pyrophyllite, clays, talc, and feldspar-silica (quartz) mixtures. Feldspar can be replaced by other minerals and mineral mixtures of similar physical properties. Weathering of the black minerals in igneous rocks—biotite and hornblende—tends to leave rust stains. Excellent crystals associated with Aegirine come from Mount Malosa, Malawi. Most feldspar is white, clear or gray, but colors from ivory to light orange in a translucent feldspar are typical of alkali feldspar. When inspecting feldspar, take care to find a fresh surface. Streak is the color of a mineral’s powder. Feldspar, an important component of Moonstones has a white streak. ┗ These minerals have a vitreous or a pearly luster, and a white streak. Hope this helps What color streak does feldspar make? 1)cleavage and color 2)luster and color 3)hardness and streak4)streak and cleavage Other worldwide sources of large Microcline crystals are the Erongo Mountains, Namibia; Papachacra, Catamarca, Argentina; the Shigar Valley, Skardu, Pakistan. Which mineral has properties most similar to anorthite? feldspar streak. Feldspar minerals have very comparable structures, chemical compositions, and …