Alkali feldspar granite Alkali feldspar granite Alkali feldspar granite, some varieties of which are called 'red granite', is a felsic igneous rock and a type of granite rich in the mineral potassium feldspar (K-spar). It is a dense rock with a phaneritic texture. The abundance of K-spar gives the rock a predominant pink to reddish hue; peppered with minor amounts of black minerals. As shown in the QAPF diagram, alkali feldspar granite contains between 20% - 60% quartz. Less quartz content would lead to "quartz alkali feldspar syenite". More than 90% of the total feldspar content is in the form of alkali feldspar.
Fall River granite a mixture of the flesh red and light green varieties; the former predominating: the quartz is light gray, and the mica, usually black... it works easily and has a lighter and more lively appearance than Quincy granite. The granite quarry industry in Fall River had been established by 1840, employing 30 people, with the rock being transported to places such as Newport, New Bedford, Providence, Bristol, and New York City. Several granite quarries operated in the area in the late 19th century, the largest of which was the Beattie Granite Quarry, located near what is now North Quarry Street, near