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