GBH meaning in Earth Science ?

Great Blue Hill, also known as Massachusett, is a hill of 635 feet (194 m) located within the Blue Hills Reservation in Milton and Canton, Massachusetts, about 10 miles (16 km) southwest of downtown Boston. It is the highest point in Norfolk County and the Greater Boston area.

The modern name for the hill was given by early European colonizers who, while sailing along the coastline, noticed the bluish hue of the exposed granite faces when viewed from a distance (due to Riebeckite). The Blue Hills' eastern slopes face the ocean and lie within Quincy. The area once attracted quarrying for its "blue granite".

The name of the Massachusett Indian tribe and their language (and thus the name of the Bay, Colony, Commonwealth/State, etc.) derive from the Massachusett name for the hill: massa-adchu-es-et, where massa- is "large", -adchu- is "hill", -es- is a diminutive suffix meaning "small", and -et is a locative suffix, identifying a place.