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Schoonmaker Mine (Cramer Mine), Strickland pegmatite (Strickland-Cramer Quarry; Strickland-Cramer Mine; Strickland-Cramer Feldspar-Mica Quarries), Collins Hill, Portland, Middlesex Co., Connecticut, USA
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Detailed Mineral List:
Actinolite
Formula: ☐{Ca2}{(Mg,Fe2+)5}(Si8O22)(OH)2
Reference: Rocks & Minerals (1955) 30:351-358
Albite
Formula: NaAlSi3O8
Reference: Rocks & Min.: 12: 141-143.; Rocks & Minerals (1955) 30:351-358
Albite var: Cleavelandite
Habit: tabular, platy
Colour: white to pale blue
Reference: Rocks & Min.: 12: 141-143.; USGS Prof Paper 255
Almandine
Formula: Fe2+3Al2(SiO4)3
Reference: Rocks & Min.: 12: 141-143.; Seaman, David W. (1947): Reminiscing On Collins Hill, Portland, Conn. Rocks & Minerals, vol. 22, no. 8, pp. 732-3.
Annite
Formula: KFe2+3(AlSi3O10)(OH)2
Reference: Rocks & Min.: 12: 141-143.
Aragonite
Formula: CaCO3
Reference: Rocks & Min.: 12: 141-143.
Bertrandite
Formula: Be4(Si2O7)(OH)2
Description: In cavities in feldspar.
Reference: Bartsch, Rudolf C. B. (1940): New England Notes. Rocks & Minerals, vol. 15, no. 6, p. 202.
Beryl var: Aquamarine
Formula: Be3Al2Si6O18
Reference: Rocks & Min.: 12: 141-143.
Beryl var: Heliodor
Colour: yellow
Reference: Harold Moritz collection; Seaman, David W. (1947): Reminiscing On Collins Hill, Portland, Conn. Rocks & Minerals, vol. 22, no. 8, pp. 732-3.
Photo: © 2010 Harold Moritz. Heliodor from Schoonmaker Mine, Strickland pegmatite, Collins Hill, Portland, Middlesex Co., Connecticut, USA
Beryl var: Morganite
Colour: pink
Description: Many fine pieces.
Reference: Bartsch, Rudolf C. B. (1940): New England Notes. Rocks & Minerals, vol. 15, no. 6, p. 202.
Calcite
Formula: CaCO3
Reference: Rocks & Minerals (1955) 30:351-358
Cordierite
Formula: (Mg,Fe)2Al3(AlSi5O18)
Reference: Am Min 35:173-184
Diopside
Formula: CaMgSi2O6
Reference: Rocks & Minerals (1955) 30:351-358
Elbaite
Formula: Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Colour: green, pink, yellow, purple, blue
Description: Some of the crystals had a deep pink center and were colorless on the outside, and some were pink at one end and green on the other. Some occurred in an unusual form, as pellets of a quarter inch or more in diameter. Some opaque tourmaline was found in triangular crystals of about 1/2 x 3”, which were a yellowish green on the outside and greyish white inside. (Little, 1942). Tourmalines in five colors were easily collected ranging from green through yellow to purple, blue, and black either from one end of a crystal to the other end or perhaps in a series of different colored crystals in parallel position with each other...A small one-half inch long bicolored pink and green tourmaline crystal with pink interior and outer edge green, like a watermelon, was picked up from the dump of the Schoonmaker mine. (Seaman, 1947)
Reference: Harold Moritz collection; Little (1942); Seaman, David W. (1947): Reminiscing On Collins Hill, Portland, Conn. Rocks & Minerals, vol. 22, no. 8, pp. 732-3.
Photo: © Albini. Elbaite from Schoonmaker Mine, Strickland pegmatite, Collins Hill, Portland, Middlesex Co., Connecticut, USA
Fluorapatite
Formula: Ca5(PO4)3F
Description: "small perfectly terminated manganapatite crystal" (Seaman, 1947)
Reference: Harold Moritz collection; Seaman, David W. (1947): Reminiscing On Collins Hill, Portland, Conn. Rocks & Minerals, vol. 22, no. 8, pp. 732-3.
Photo: © 2010 Harold Moritz. Fluorapatite from Schoonmaker Mine, Strickland pegmatite, Collins Hill, Portland, Middlesex Co., Connecticut, USA
Fluorite
Formula: CaF2
Colour: purple
Description: found in two forms; as dark purple cleavage pieces, and as nodules that were covered with a grey film, but that fluoresced a beautiful lavender blue. The cleavage pieces were not fluorescent. With pyrite.
Reference: Rocks & Min.: 12: 141-143.; Rocks & Minerals (1955) 30:351-358; Little (1942)
Photo: Fluorite from Schoonmaker Mine, Strickland pegmatite, Collins Hill, Portland, Middlesex Co., Connecticut, USA
Grossular
Formula: Ca3Al2(SiO4)3
Reference: Rocks & Minerals (1955) 30:351-358
'Gummite'
Colour: reddish-orange
Description: Associated with crystallized uraninite.
Reference: Schooner, Richard. (1947): Collins Hill (Portland, Conn.) Deserted. Rocks & Minerals, vol. 22, no. 2, p. 135.
Lepidolite
Colour: purple
Reference: Rocks & Min.: 12: 141-143.; Bartsch, Rudolf C. B. (1940): New England Notes. Rocks & Minerals, vol. 15, no. 6, p. 202.
Photo: © 2010 Harold Moritz. Lepidolite from Schoonmaker Mine, Strickland pegmatite, Collins Hill, Portland, Middlesex Co., Connecticut, USA
Lithiophilite
Formula: LiMn2+PO4
Colour: deep orange-red to reddish brown to light brown
Description: with some spodumene and lepidolite; some very fine specimens of deep orange-red color in quartz
Reference: Little, L. W. (1942): Recent Finds of Minerals in Central Connecticut. Rocks and Minerals. vol. 17, pp 280-2.; Bartsch, Rudolf C. B. (1940): New England Notes. Rocks & Minerals, vol. 15, no. 6, p. 202.
Microcline
Formula: KAlSi3O8
Reference: Rocks & Min.: 12: 141-143.
Montebrasite
Formula: LiAl(PO4)(OH)
Habit: typically anhedral
Colour: white or pinkish, with brown rind
Description: called amblygonite, but shown by others to be montebrasite
Reference: Little, L. W. (1942): Recent Finds of Minerals in Central Connecticut. Rocks and Minerals, vol. 17, pp. 280-2.; Bartsch, Rudolf C. B. (1940): New England Notes. Rocks & Minerals, vol. 15, no. 6, p. 202.
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Rocks & Min.: 12: 141-143.; USGS Prof Paper 255
Pickeringite
Formula: MgAl2(SO4)4 · 22H2O
Reference: Rocks & Minerals (1955) 30:351-358
'Pinite'
Colour: yellow, green, gray, lavendar, brown
Description: Alteration of spodumene.
Reference: Am Min 35:173-184; Bartsch, Rudolf C. B. (1940): New England Notes. Rocks & Minerals, vol. 15, no. 6, p. 202.
Pyrite
Formula: FeS2
Habit: cubic
Colour: brassy yellow
Description: bright cubes of pyrite which varied in size up to 1/2 inch on the faces
Reference: Rocks & Min.: 12: 141-143.; Rocks & Minerals (1955) 30:351-358; Little (1942)
Quartz
Formula: SiO2
Reference: Rocks & Minerals (1955) 30:351-358; USGS Prof Paper 255
Quartz var: Rock Crystal
Reference: Rocks & Min.: 12: 141-143.
Quartz var: Smoky Quartz
Formula: SiO2
Reference: Rocks & Min.: 12: 141-143.
Rhodochrosite
Formula: MnCO3
Reference: Bartsch, Rudolf C. B. (1940): New England Notes. Rocks & Minerals, vol. 15, no. 6, p. 202.
'Scapolite' ?
Reference: Rocks & Minerals (1955) 30:351-358
Schorl
Formula: Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Colour: black
Reference: Rocks & Min.: 12: 141-143.; Seaman, David W. (1947): Reminiscing On Collins Hill, Portland, Conn. Rocks & Minerals, vol. 22, no. 8, pp. 732-3.
Photo: © 2010 Harold Moritz. Schorl from Schoonmaker Mine, Strickland pegmatite, Collins Hill, Portland, Middlesex Co., Connecticut, USA
Sphalerite
Formula: ZnS
Colour: black
Reference: Bartsch, Rudolf C. B. (1940): New England Notes. Rocks & Minerals, vol. 15, no. 6, p. 202.
Spodumene
Formula: LiAlSi2O6
Habit: elongated, flat crystals with dome termination
Colour: tan to lavendar
Description: Much material etched to look like wood or altered to pinite.
Reference: Harold Moritz collection.; Seaman, David W. (1947): Reminiscing On Collins Hill, Portland, Conn. Rocks & Minerals, vol. 22, no. 8, pp. 732-3.
Photo: © 2010 Harold Moritz. Spodumene from Schoonmaker Mine, Strickland pegmatite, Collins Hill, Portland, Middlesex Co., Connecticut, USA
'Tourmaline var: Rubellite'
Reference: Rocks & Min.: 12: 141-143.
Photo: Rubellite from Schoonmaker Mine, Strickland pegmatite, Collins Hill, Portland, Middlesex Co., Connecticut, USA
'Tourmaline var: Verdelite'
Reference: Rocks & Min.: 12: 141-143.
Uraninite
Formula: UO2
Reference: Schooner, Richard. (1947): Collins Hill (Portland, Conn.) Deserted. Rocks & Minerals, vol. 22, no. 2, p. 135.
Xenotime-(Y)
Formula: Y(PO4)
Reference: Rocks & Minerals (1955) 30:351-358
Zoisite
Formula: {Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Reference: Rocks & Minerals (1955) 30:351-358


39 entries listed. 28 valid minerals.

References

Zodac, Peter. (1937): Minerals of the Strickland Quarry. Rocks & Minerals: 12: 131-141.

Bartsch, Rudolf C. B. (1940): New England Notes. Rocks & Minerals: 15(6): 202.

Little, L. W. (1942): Recent Finds of Minerals in Central Connecticut. Rocks & Minerals: 17(8): 280-2.

Schooner, Richard. (1947): Collins Hill (Portland, Conn.) Deserted. Rocks & Minerals: 22(2): 135.

Seaman, David W. (1947): Reminiscing On Collins Hill, Portland, Conn. Rocks & Minerals: 22(8): 732-3.

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

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.

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): 70(6): 403.

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