| Locality type: | Prospect |
| Classification |
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| Species: | Cookeite |
| Formula: | (LiAl4◻)[AlSi3O10](OH)8 |
| Comments: | associated with elbaite, lepidolite, beryl |
| Habit: | botryoidal aggregates of platy crystals |
| Colour: | pale yellow to gray |
| Abundance at site: | Common |
| Confirmation |
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| Validity: | Confirmed |
| Confirmation Methods: | Visually Identified |
| Associated Minerals Based on Photo Data: |
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| Elbaite | 8 |
| Lepidolite | 6 |
| Quartz | 5 |
| Cassiterite | 2 |
| Albite | 1 |
| - var Cleavelandite | 1 |
| Kaolinite | 1 |
| Data |
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| Mineral Data: | Click here to view Cookeite data |
| Locality Data: | Click here to view Brack Gem prospect (Brack prospect), East Glastonbury, Glastonbury, Hartford County, Connecticut, USA |
| Photo Gallery | View Gallery (2 photos) |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 560689 |
| Long-form Identifier: | 1:3:560689:4 |
| GUID (UUID V4): | 0 |
| Nearest other occurrences of Cookeite |
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| 6.8km (4.2 miles) | ⓘState Forest Quarry No. 1, East Hampton, Middlesex County, Connecticut, USA |
| 6.8km (4.3 miles) | ⓘSimpson Quarry (Wiarda Quarry), South Glastonbury, Glastonbury, Hartford County, Connecticut, USA |
| 9.4km (5.8 miles) | ⓘStrickland Quarry, Strickland pegmatite, Collins Hill, Portland, Middlesex County, Connecticut, USA |
| 13.0km (8.1 miles) | ⓘRiverside Quarry (Western Quarry), White Rock Mining District, Middletown, Middlesex County, Connecticut, USA |
| 13.2km (8.2 miles) | ⓘWhite Rocks Quarry (Consolidated Quarry), White Rock Mining District, Middletown, Middlesex County, Connecticut, USA |
| 15.3km (9.5 miles) | ⓘAnderson No. 1 Mica Mine, East Hampton, Middlesex County, Connecticut, USA |
| 17.9km (11.1 miles) | ⓘGillette Quarry (J-J Mine; Haddam Neck Quarry), Haddam Neck, Haddam, Middlesex County, Connecticut, USA |
| 18.3km (11.4 miles) | ⓘQuarry Hill (Brainerd Quarries; Shailor Quarries), Haddam Neck, Haddam, Middlesex County, Connecticut, USA |
| 22.3km (13.9 miles) | ⓘHewitt Gem Quarry (Herb's Gem Quarry; Sawmill Quarry), Haddam, Middlesex County, Connecticut, USA |
| 68.1km (42.3 miles) | ⓘBlandford mica mines, Blandford, Hampden County, Massachusetts, USA |
| References |
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Brack Gem prospect, East Glastonbury, Glastonbury, Hartford County, Connecticut, USA