From micro- (“small”) + -cline.
microcline (countable and uncountable, plural microclines)
- (mineralogy) A common feldspar of igneous, plutonic, and metamorphic rocks, made of potassium aluminum silicate, with the chemical formula KAlSi3O8. Microcline is the main feldspar of granite. The bluish-green variety is called amazonstone, and is sometimes of gem quality. Used in ceramics, ceramic glazes, and as a scouring powder.
- “Microcline” in David Barthelmy, Webmineral Mineralogy Database, 1997–.
- microcline mindat.org, Hudson Institute of Mineralogy, accessed 29 August 2016