Habit : Prismatic, stubby to elongate crystals are typical. When this happens, twinning usually results. Optical Properties : Microcline s tartan plaid twinning (a combination of albite and pericline twinning) is its most diagnostic. Microcline is the lowest temperature form of alkali feldspar. Crystallography : Triclinic, a = 8.58, b = 12.96, c = 7.21, a = 89.7°, b = 115.97°, g = 90.87°, Z = 4; space group P1; point group 1. Low relief and low 1st order birefringence – sometimes tin ggyed yellow. Optical Properties. The really precise way is to use thin sections to determine the optical properties along the different crystallographic axes. The blue-green feldspar amazonite is the only gem variety of microcline. Microcline is identical to orthoclase in many physical properties, and can be distinguished by x-ray or optical examination. Microcline (Greek - small slope) has the same chemical composition as orthoclase but is classified in the triclinic crystal system. Fermion Index: Fermion Index = 0.01 Boson Index = 0.99 : Photoelectric: PE Microcline = 2.85 barns/electron U=PE Microcline x r electron = … Microcline is the stable form below about 400 C. Orthoclase and sanidine are stable above 500 C and 900 C, respectively. Its chemistry and atomic arrangement are variable, so optical properties vary as well. Microcline is identical to orthoclase in many physical properties; it can be distinguished by x-ray or optical examination; viewed under a polarizing microscope, microcline exhibits a minute multiple twinning which forms a grating-like structure that is unmistakable. Chemically very stable mineral, and with mediumwith medium-high hardness (7)high hardness (7) Uniaxial (Trigonal) positive and length fastlength fast. When viewed under a polarizing microscope, microcline exhibits a minute multiple twinning which forms a grating-like structure that is unmistakable. Microcline (thin section) View Description. The amateur has a few clues. Add tags Comment Rate. To link to this object, paste this link in email, IM or document To embed this object, paste this HTML in website. Calculated Properties of Microcline : Electron Density: Bulk Density (Electron Density)=2.54 gm/cc note: Specific Gravity of Microcline =2.56 gm/cc. The three principle varieties of K-feldspar are microcline (low temperature), orthoclase (medium temperature), sanidine (high temperature). Upon cooling, orthoclase must rearrange its structure from monoclinic to triclinic. Download: … Optical Properties Qti l hittQuartz is commonly white to colourless in hand speciman and colourless in thin section. Home Rocks and Minerals Microcline (thin section) Reference URL Share . Other, rare, related feldspar varieties include adularia and anorthoclase. Quartz is uniaxial positive with a low relief and low birefringence, thus ... Microcline.
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