"Orthoclase" Quotes from Famous Books
 ... district is almost exclusively formed of gneiss, abounding with garnets, and porphyritic with large crystals, even three and four inches in length, of orthoclase feldspar: in these crystals mica and garnets are often enclosed. At the western base of the Corcovado, there is some ferruginous carious quartz-rock; and in the Tijeuka range, much fine- grained granite. I observed boulders of greenstone ...
— South American Geology - also: - Title: Geological Observations On South America • Charles Darwin
... the large family of micas, with names like muscovite and phlogopite. There are the feldspars, including albite and orthoclase. Others are amphiboles, pyroxenes, zeolites, garnets and many others you may never find or hear about unless you become a ...
— Let's collect rocks & shells • Shell Oil Company |
