Alkali Feldspar Granite Hand Sample Photos. Click on any photo for a larger image. Some of the larger images may be on other web sites and will open in a new window.

Cape Ann Granite

afghs_001. Closeup photo of a quarried block of the Cape Ann Granite. Most of the white to green-gray minerals are alkali felspar (microperthite). The dark gray mineral is quartz. The black minerals are a mixture of iron-rich clinopyroxene (aegirine) an iron-rich amphibole (arfvedsonite).



Nadelwitz Granite

afghs_002. Alkali feldspar granite from Nadelwitz, Germany. Pink alkali feldspar, gray quartz, minor white plagioclase. Specimen width is 9.5 cm. Image from the The Museum of Mineralogy and Petrography Grigore Cobalcescu on Sketchfab.