Oxford pegmatite field. Many granite pegmatites are located in Rumford, and some were operated for sheet or scrap mica, while others were operated for feldspar. There are also a number of beryl prospects.

Around 1910, high-quality chrysoberyl crystals were found at the Ragged Ass Jack Mountain Locality in Hartford, Maine. The collectors who wanted to keep the locality a secret said that the chrysoberyl came from "Black Mountain" in the adjoining town of Peru. Because Black Mountain in Rumford is a very famous mineral locality, several specimens from the so-called Black Mountain locality in Peru have been erroneously relabeled Rumford instead of Hartford. Chrysoberyl has not been formally reported from anywhere in Rumford.

The village of Rumford was informally known as Rumford Falls, because of its prominent water falls on the Androscoggin River. Jackson (1838, p. 97-99) discovered beds of limestone and wrote: "On a point just below the great falls, there is a bed of granular limestone... This bed is of a coarse granular or crystaline [sic] variety of carbonate of lime, containing scattered green crystals of actynolite snd pargasite, in small grains and fibres. ... A variety of crystallized silicates of various kinds, are found in the poorer limestone beds; and observing their resemblance to similar productions of the Phipsburg [sic] limestone, I searched and found a number of those rare minerals which I had formerly discovered at the latter locality. Yellow garnet, massive and crystallized - egeran - pyroxene, of several species and varieties - such as sahlite, augite and pargasite. Phosphate of lime, of the variety called asparagus stone, &c. occur, with a few scattered crystals of scapolite." Jackson continued with a report on the usefulness of the limestone to make lime and how much might be quarried. Many local mineral collectors probably visited the area to collect minerals, but those who searched during the 20th century all reported disappointment. It is unknown if the limestone was used to make lime. However, with the rapid development of Rumford into a paper manufacturing town in the early 1890s, the remaining limestone beds could have been submerged by the small dams used to raise river water levels to channel the log drive wood into the paper mill. The only important "point" is now occupied by a small city park.

Fossils

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Other Databases

Wikipedia:	https://en.wikipedia.org/wiki/Rumford,_Maine
Wikidata ID:	Q2740297
GeoNames ID:	6299014

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References