Other rare varieties include troctolite which has a greater percentage of calcic plagioclase. With an increase in calcic plagioclase and mafic minerals the rock type becomes a diorite. Rock formed almost entirely of calcic plagioclase feldspar is known as anorthosite. The mineralogy of basalt is characterized by a preponderance of calcic plagioclase feldspar and pyroxene. Cotton is produced around Point Pedro in the fertile calcic red latosol soils. The tectonic setting for calcic Fe skarns tends to be the oceanic island arcs. Calcic plagioclase is stable to a depth of . However, basalt consists mostly of clinopyroxene (augite) and calcic plagioclase. Peat mud and chalybeate bicarbonate calcic springs are used to treat patients. The dominant phenocrysts are zoned plagioclase, hypersthene, calcic clinopyroxene, titanomagnetite, and rimmed olivine.