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Cookeite from
Strickland Quarry (Eureka Quarry), Strickland pegmatite (Strickland-Cramer Quarry; Strickland-Cramer Mine; Strickland-Cramer Feldspar-Mica Quarries), Collins Hill, Portland, Middlesex Co., Connecticut, USA

Locality type:Quarry
Classification
Species:Cookeite
Formula:(Al2Li)Al2(AlSi3O10)(OH)8
Comments:Typically as tiny spheres of crystal aggregates with K-rich albite, micas, elbaite, quartz, calcite, pyrite, fluorite, and bertrandite in cleavelandite of the mineralized intermediate plagioclase-quartz zone. Rare pseudomorphs of spodumene. Schooner (1955) says: "solid masses of bright yellow fine-grained material. Some pieces were seen to be as much as 4 or 5 inches thick, the mineral having occurred as a lining in a long cavity or series of cavities."
Habit:micro-globular aggregates, masses, pseudomorphs after spodumene
Colour:pale yellow
Quality for species:Good crystals or rich for species - important (!)
Abundance at site:Common
Confirmation
Validity:Believed Valid
References
References:Schooner, Richard. (1955): 90 Minerals from 1 Connecticut Hill. Rocks & Minerals: 30(7-8): 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.
Associated Minerals Based on Photo Data:
Albite7 photos of Cookeite associated with Albite at this locality.
Elbaite6 photos of Cookeite associated with Elbaite at this locality.
Smoky Quartz6 photos of Cookeite associated with Smoky Quartz at this locality.
Almandine5 photos of Cookeite associated with Almandine at this locality.
Fluorapatite4 photos of Cookeite associated with Fluorapatite at this locality.
Microcline3 photos of Cookeite associated with Microcline at this locality.
Muscovite3 photos of Cookeite associated with Muscovite at this locality.
Lepidolite2 photos of Cookeite associated with Lepidolite at this locality.
Fluorite2 photos of Cookeite associated with Fluorite at this locality.
Wodginite2 photos of Cookeite associated with Wodginite at this locality.
Data
Mineral Data:Click here to view Cookeite data
Locality Data:Click here to view Strickland Quarry (Eureka Quarry), Strickland pegmatite (Strickland-Cramer Quarry; Strickland-Cramer Mine; Strickland-Cramer Feldspar-Mica Quarries), Collins Hill, Portland, Middlesex Co., Connecticut, USA
Photo GalleryView Gallery (7 photos)
Nearest other occurrences of Cookeite
4.0km (2.5 miles) Riverside Quarry (Western Quarry), White Rock Mining District, Middletown, Middlesex Co., Connecticut, USA
4.3km (2.7 miles) White Rocks Quarry (Consolidated Quarry), White Rock Mining District, Middletown, Middlesex Co., Connecticut, USA
5.1km (3.2 miles) Simpson Quarry (Wiarda Quarry), South Glastonbury, Glastonbury, Hartford Co., Connecticut, USA
9.0km (5.6 miles) Brack Gem prospect (Brack prospect), East Glastonbury, Glastonbury, Hartford Co., Connecticut, USA
13.0km (8.1 miles) Gillette Quarry (J-J Mine; Haddam Neck Quarry), Haddam Neck, Haddam, Middlesex Co., Connecticut, USA
13.5km (8.4 miles) Quarry Hill (Brainerd Quarries; Shailor Quarries), Haddam Neck, Haddam, Middlesex Co., Connecticut, USA
16.9km (10.5 miles) Hewitt Gem Quarry (Herb's Gem Quarry; Sawmill Quarry), Haddam, Middlesex Co., Connecticut, USA
71.5km (44.4 miles) Blandford mica mines, Blandford, Hampden Co., Massachusetts, USA
95.4km (59.3 miles) Clark Ledge pegmatite locality, Chesterfield, Hampshire Co., Massachusetts, USA
99.5km (61.9 miles) Barrus farm pegmatite localities (Weeks farm), Goshen, Hampshire Co., Massachusetts, USA
 
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