orthoclase feldspar
91anorthoclase — /an awr theuh klays , klayz /, n. Mineral. a variety of microcline, rich in sodium and sometimes having a play of color: sometimes considered a variety of orthoclase. [AN 1 + ORTHOCLASE] * * * any member of a continuous series of feldspar… …
92sanidine — sanidinic /san i din ik/, adj. /san i deen , din/, n. Mineral. a glassy, often transparent variety of orthoclase in which sodium may replace as much as 50 percent of the potassium: forms phenocrysts in some igneous rocks. [1805 15; < G Sanidin,… …
93anorthoclase — əˈnȯrthəˌklās, āz noun ( s) Etymology: International Scientific Vocabulary an + orthoclase; originally formed as German anorthoklase : a feldspar of chiefly sodium potassium aluminum silicate that is closely related to orthoclase but triclinic …
94microcline — ˈmīkrəˌklīn noun ( s) Etymology: German mikroklin, from mikr micr + klin (from Greek klinein to lean) more at lean : a mineral of the feldspar group that is like orthoclase in composition but is triclinic though approaching orthoclase in crystal… …
95Microcline — Mi cro*cline, n. [Micro + Gr. ? to incline.] (Min.) A mineral of the feldspar group, like orthoclase or common feldspar in composition, but triclinic in form. [1913 Webster] …
96Tonalite — is an igneous, plutonic (intrusive) rock, of felsic composition, with phaneritic texture. Feldspar is present as plagioclase (typically oligoclase or andesine) with 10% or less alkali feldspar. Quartz is present as more than 20% of the rock.… …
97Amphibolite — (pronEng|æmˈfɪbəlaɪt) is the name given to a rock consisting mainly of hornblende amphibole, the use of the term being restricted, however, to metamorphic rocks. The modern terminology for a holocrystalline plutonic igneous rocks composed… …
98Diorite — classification on QAPF diagram Di …
99Greywacke — (German grauwacke , signifying a grey, earthy rock) is a variety of sandstone generally characterized by its hardness, dark color, and poorly sorted, angular grains of quartz, feldspar, and small rock fragments set in a compact, clay fine matrix …
100Silicate minerals — The silicate minerals make up the largest and most important class of rock forming minerals, constituting approximately 90 percent of the crust of the Earth. They are classified based on the structure of their silicate group. Silicate minerals… …
