| Locality type: | Quarry |
| Classification |
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| Species: | Bertrandite |
| Formula: | Be4(Si2O7)(OH)2 |
| Formation: | Secondary |
| Comments: | Micro-crystals and aggregates in voids left by dissolved beryl crystals. Also part of a suite of micro-minerals pseudomorphing beryl crystals. |
| Habit: | multiple forms, from simple to complex and as various twins. Usually flattened, elongated, or blocky. |
| Colour: | colorless |
| Quality for species: | Good crystals or rich for species - important (!) |
| Significance: | Unusual or interesting association, relationships with other species, pseudomorphism etc. - see notes. |
| 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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| Quartz | ⓘ23 photos of Bertrandite associated with Quartz at this locality. |
| Adularia | ⓘ17 photos of Bertrandite associated with Adularia at this locality. |
| Muscovite | ⓘ16 photos of Bertrandite associated with Muscovite at this locality. |
| Albite | ⓘ15 photos of Bertrandite associated with Albite at this locality. |
| Beryl | ⓘ9 photos of Bertrandite associated with Beryl at this locality. |
| Almandine | ⓘ2 photos of Bertrandite associated with Almandine at this locality. |
| Microcline | ⓘ2 photos of Bertrandite associated with Microcline at this locality. |
| Wulfenite | ⓘ1 photo of Bertrandite associated with Wulfenite at this locality. |
| Columbite-(Fe)-Columbite-(Mn) Series | ⓘ1 photo of Bertrandite associated with Columbite-(Fe)-Columbite-(Mn) Series at this locality. |
| Chlorite Group | ⓘ1 photo of Bertrandite associated with Chlorite Group at this locality. |
| Data |
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| Mineral Data: | Click here to view Bertrandite data |
| Locality Data: | Click here to view Biermann Quarries (Bethel quarries) and tourmaline ledge, Bethel, Fairfield County, Connecticut, USA |
| Photo Gallery | View Gallery (17 photos) |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 37846 |
| Long-form Identifier: | 1:3:37846:0 |
| GUID (UUID V4): | f6055710-e520-46b7-ab7d-4b4d95759a9c |
| Nearest other occurrences of Bertrandite |
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| 1.7km (1.1 miles) | ⓘCaptain Cook's Quarry (Purdy Station Quarry), Newtown, Fairfield County, Connecticut, USA |
| 11.4km (7.1 miles) | ⓘU. S. Route 7 Expressway (Danbury line to Iron Works District), Brookfield, Fairfield County, Connecticut, USA |
| 12.1km (7.5 miles) | ⓘFillow Quarry (Branchville Quarry; Branchville Mica Mine; Smith Mine), Branchville, Redding (Reading), Fairfield County, Connecticut, USA |
| 12.2km (7.6 miles) | ⓘOld Mine Plaza construction site, Long Hill, Trumbull, Fairfield County, Connecticut, USA |
| 15.1km (9.4 miles) | ⓘBrookfield, Fairfield County, Connecticut, USA |
| 15.4km (9.6 miles) | ⓘCasey Quarry (Ridgefield pegmatite), Ridgefield, Fairfield County, Connecticut, USA |
| 15.9km (9.9 miles) | ⓘState Route 25 road cuts, Trumbull, Fairfield County, Connecticut, USA |
| 17.6km (10.9 miles) | ⓘTrumbull, Fairfield County, Connecticut, USA |
| 18.1km (11.2 miles) | ⓘCurtis Quarry (Southford Quarry; Southford pegmatite; Southbury rose quartz quarry; Bridgeport Woodfinishing Co. Quarry; Hulls Hill), Southford, Southbury, New Haven County, Connecticut, USA |
| 27.8km (17.3 miles) | ⓘWoodbury pegmatite quarry (Judson Quarry), Woodbury, Litchfield County, Connecticut, USA |
| References |
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Biermann Quarries (Bethel quarries) and tourmaline ledge, Bethel, Fairfield County, Connecticut, USA