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Civilian Conservation Corps prospect (CCC prospect; Cook columbite prospect), Haddam, Middlesex Co., Connecticut, USA

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Detailed Mineral List:
Albite
Formula: Na(AlSi3O8)
Colour: white
Reference: Harold Moritz collection
Photo: © 2016 Harold Moritz. Albite from Civilian Conservation Corps prospect, Haddam, Middlesex Co., Connecticut, USA
Almandine
Formula: Fe2+3Al2(SiO4)3
Colour: red
Description: XRF analyses of other pegmatitic garnets from the district indicate they are mostly almandine, with some spessartine component. Garnets from this locality have not been tested.
Reference: Harold Moritz collection
Photo: © 2009 Peter Cristofono. Almandine from Civilian Conservation Corps prospect, Haddam, Middlesex Co., Connecticut, USA
Beryl
Formula: Be3Al2(Si6O18)
Colour: pale green
Reference: http://www.lmscc.org/CCCQuarry.htm
Photo: © Andrew Kruegel 2008. Beryl from Civilian Conservation Corps prospect, Haddam, Middlesex Co., Connecticut, USA
Beryl var: Heliodor
Formula: Be3Al2(Si6O18)
Colour: yellow to orange-brown
Description: Typically in radiating groups with tiny columbites. Good gem crystals rare.
Reference: www.lmscc.org/CCCQuarry.htm; Williams (circa 1945)
Photo: © 2010 Harold Moritz . Heliodor from Civilian Conservation Corps prospect, Haddam, Middlesex Co., Connecticut, USA
Columbite-(Fe)
Formula: FeNb2O6
Habit: elongated, tabular to blocky and equant
Colour: black with iridescence
Description: Crystals vary from microscopic ones typically attached to beryls to large masses over 36 pounds in pegmatite matrix. They can be tabular, elongated or blocky and equant. Typically iridescent. Besides the 19th century wet chemical analyses given in the reference, also confirmed by Raman spectroscopy by Paul Bartholomew, U. of New Haven.
Reference: Hunt, T. S. (1852): Examination of some American Minerals. American Journal Of Science: s. 2: 14: 40-1.
Photo: © Ron Gyllenhammer. Columbite-(Fe) from Civilian Conservation Corps prospect, Haddam, Middlesex Co., Connecticut, USA
Fluorapatite
Formula: Ca5(PO4)3F
Colour: pale green
Fluorescence: yellow
Reference: www.lmscc.org/CCCQuarry.htm
Microcline
Formula: K(AlSi3O8)
Colour: tan
Reference: www.lmscc.org/CCCQuarry.htm
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Description: Mostly anhedral masses, a few sub to euhedral crystals were found at the prospect.
Reference: www.lmscc.org/CCCQuarry.htm
Photo: © 2010 Harold Moritz . Muscovite from Civilian Conservation Corps prospect, Haddam, Middlesex Co., Connecticut, USA
Quartz
Formula: SiO2
Colour: smoky
Description: Mostyl massive, the only crystals come from tiny pockets.
Reference: www.lmscc.org/CCCQuarry.htm
Photo: © 2016 Harold Moritz. Quartz from Civilian Conservation Corps prospect, Haddam, Middlesex Co., Connecticut, USA
Schorl
Formula: Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Habit: prismatic
Colour: black
Description: Mostly small crystals, not common.
Reference: Harold Moritz collection
Photo: © Adam Berluti. Schorl from Civilian Conservation Corps prospect, Haddam, Middlesex Co., Connecticut, USA
Spessartine ?
Formula: Mn2+3Al2(SiO4)3
Colour: red
Description: XRF analyses of other pegmatitic garnets from the district indicate they are mostly almandine, with some spessartine component but not enough to change the species. Garnets from this locality have not been tested.
Reference: http://www.lmscc.org/CCCQuarry.htm
Uraninite
Formula: UO2
Colour: black
Description: Tiny crystals rarely found.
Reference: http://www.lmscc.org/CCCQuarry.htm

References

Cook, John E. (1850 circa), Notes by him in the account book of his father Nathaniel Cook. Haddam Historical Society, Thankful Arnold House, Haddam, Connecticut.

Hunt, T. S. (1852), Examination of some American Minerals. American Journal Of Science: s. 2: 14: 340-1.

Shepard, Charles Upham, Sr. (1870), A new variety (species?) of Columbite. American Journal of Science: s. 2:, 50: 90.

Delafontaine, Prof. (1877), On the Hermannolite of Shepard, and on the Samarskite of North Carolina. American Journal of Science: s. 3, 13(77): 390.

Williams, Horace S. (1899), Letter to Miss Eveline Brainerd of Haddam, February 18, 1899. Brainerd Public Library, Haddam, Connecticut.

Davis, James W. (1901), The Minerals of Haddam, Conn. Mineral Collector: 8(4): 50-54.

Davis, James W. (1901), The Minerals of Haddam, Conn. Mineral Collector: 8(5): 65-70.

Williams, Horace S. (circa 1945), Article for New York Society of Mineralogists. Brainerd Public Library, Haddam, Connecticut.

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