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