Fayalite

specimen number:
1052880

location:
Rockport, Essex Co., Massachusetts, USA

description:
Masses of fayalite throughout matrix. The specimen comes with an antique label as shown at the end of the video and dates to the early 20th century.

Rockport, located in Essex County, Massachusetts, has a rich industrial history rooted in its famous granite quarries, which operated extensively from the mid-19th through the early 20th centuries and provided stone for prominent buildings and monuments across the United States. Geologically, the area is situated within the Cape Ann granitic complex, composed of alkali granite and related plutonic rocks emplaced during the Paleozoic era. Within these intrusive igneous formations, cooling pockets, miarolitic cavities, and pegmatitic zones host a specialized suite of accessory minerals. Among these, fayalite, the iron-rich endmember of the olivine group, occurs as dark, well-formed crystals within the granitic pegmatites and vugs of the region, making Rockport a classic locality for mineralogists studying this uncommon mineral species.

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