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Hale-Walker prospects, Collins Hill, Portland, Middlesex Co., Connecticut, USA
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Latitude: 41°35'7"N
Longitude: 72°35'17"W
 
 
Two small prospects in narrow granitic pegmatite dike best known for its aquamarine. Minerals such as good epidote in quartz veins from the surrounding metamorphics are also included. According to Cameron et al (1954):

"The pegmatite...crops out on land owned jointly by Charles F. Walker, R. F. D., Portland, and Harry L. Walker, R. F. D., Glastonbury. It may extend eastward beneath overburden to land owned by Clifford Hale, R. F. D., Portland. In 1932 two small cuts were opened on the Walker property by the Eureka Flint & Spar Co., Portland, and were worked for 3 or 4 months for feldspar. According to Mr. William Wilkes, superintendent, about 70 tons of no. 1 feldspar was recovered. Both quarries have since been idle. The upper opencut is 25 feet long, 9 feet wide, and 1 to 10 feet deep. The lower opencut is 38 feet long, 10 feet wide, and 5 to 18 feet deep. Both pits are free of water and probably contain little backfill. The prospect was mapped by E. N. Cameron and V. E. Shainin in May 1943."

The pegmatite is a tabular body at least 180 feet long and 6 to 8 feet thick. It ranges in strike from N. 79° W. to east and dips 63° to 74° SW. The dike is sharply discordant to the enclosing granite-gneiss (Monson gneiss), whose foliation strikes N. 20° W. and dips westward at moderate to steep angles. The contact between the Monson gneiss and the Bolton schist lies 60 feet west of the westernmost exposure of the pegmatite. The pegmatite does not seem to extend across the contact.

The dike, a disseminated type of beryl deposit, consists chiefly of quartz and perthite. It has a border zone and a core. The border zone is ½ to 1 inch thick and is composed of fine-grained quartz, plagioclase and tourmaline. The core consists of medium- to coarse-grained quartz and perthite with subordinate amounts of plagioclase, muscovite, and accessory beryl, tourmaline, columbite-tantalite and monazite. Monazite is rare.
Most of the beryl occurs in the core, either with small anhedral crystals of perthite scattered in a matrix of coarse quartz, plagioclase and accessory tourmaline, or with fine-grained quartz, plagioclase, and accessory tourmaline.

The beryl is green to blue-green and occurs in crystals 0.2 to 2 inches long and 0.1 to 2 inches in diameter, but most of the crystals are very small.

Mindat Articles

Hale Walker by Rowan Lytle


Mineral List

Albite
var: Peristerite
'Allanite' ?
Almandine
Annite
Beryl
var: Aquamarine
'Columbite'
Epidote
Fluorapatite
Hematite ?
'Hornblende'
'Limonite'
Magnetite
Malachite
Meta-autunite
Metatorbernite
Microcline
Microlite Group ?
'Monazite'
Muscovite
Natrolite
Opal
Pyrite
Quartz
Samarskite-(Y)
Schorl
Spessartine ?
'Tourmaline'


29 entries listed. 19 valid minerals. 2 erroneous literature entries.

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References

Cameron, Eugene N., Larrabee David M., McNair, Andrew H., Page, James T., Stewart, Glenn W., and Shainin, Vincent E. (1954): Pegmatite Investigations 1942-45 New England; USGS Professional Paper 255.

Schooner, Richard. (1955): 90 Minerals from 1 Connecticut Hill. Rocks and Minerals, vol. 30, no. 7-8, pp. 351-8.

Schooner, Richard. (1958): The Mineralogy of the Portland-East Hampton-Middletown-Haddam Area in Connecticut (With a few notes on Glastonbury and Marlborough). Published by Richard Schooner; Ralph Lieser of Pappy’s Beryl Shop, East Hampton; and Howard Pate of Fluorescent House, Branford, Connecticut.

Stugard, Frederick, Jr. (1958): Pegmatites of the Middletown Area, Connecticut. USGS Bulletin 1042-Q.

Jones, Robert W. (1960): Luminescent Minerals of Connecticut, A Guide To Their Properties and Locations.

Schooner, Richard. (1961): The Mineralogy of Connecticut. Fluorescent House, Branford, Connecticut.

Ryerson, Kathleen. (1972): Rock Hound's Guide to Connecticut. Pequot Press.

Januzzi, Ronald. (1976): Mineral Localities of Connecticut and Southeastern New York State (Taylor Assoc./Mineralogical Press).

Albini, Anthony J. (1979): Selected Pegmatite Quarries of the Central Connecticut Region. Masters thesis. Central Connecticut State College, New Britain, Connecticut

Webster, Bud and Bill Shelton. (1979): Mineral Collector’s Field Guide the Northeast.

Weber, Marcelle H. and Earle C. Sullivan. (1995): Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue), Vol. 70, No. 6, p. 403.

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