Name:   Alkali Granite

Geologic Name:  Quincy Granite

Reference: Warren, C.H., Petrology of the alkali granites and porphyries of Quincy and
the Blue Hills, Massachusetts:  Am. Acad. Arts Sci. Proc., vol. 49, No. 5, p. 203-331,
1913.

Microscopic characters:  Hypautomorphic-granular texture.  The essential constituents
are microcline-albite microperthite, quartz green aegirite closely associated with blue
pleochroic riebeckite and brown cataphorite.  Magnetite, zircon and flluorite are the
accessory minerals.