| Locality type: | Borough |
| Classification |
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| Species: | Sillimanite |
| Formula: | Al2(SiO4)O |
| Comments: | Vitreous, translucent, somewhat chatoyant, clove brown crystals to 4 cm in granular quartz with magnetite are from an unspecified location. |
| Habit: | elongated prisms |
| Colour: | clove brown |
| Quality for species: | Good crystals or rich for species - important (!) |
| 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 | 4 |
| Magnetite | 1 |
| Data |
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| Mineral Data: | Click here to view Sillimanite data |
| Locality Data: | Click here to view Willimantic, Windham, Windham County, Connecticut, USA |
| Photo Gallery | View Gallery (4 photos) |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 717657 |
| Long-form Identifier: | 1:3:717657:9 |
| GUID (UUID V4): | 0 |
| Nearest other occurrences of Sillimanite |
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| 4.4km (2.7 miles) | ⓘUS Route 6 Willimantic Bypass expressway road cuts, Coventry, Tolland County, Connecticut, USA |
| 18.3km (11.4 miles) | ⓘBecker Quarry, Willington, Tolland County, Connecticut, USA |
| 22.6km (14.1 miles) | ⓘFalls of the Yantic River, Norwich, New London County, Connecticut, USA |
| 24.2km (15.1 miles) | ⓘWestchester, Colchester, New London County, Connecticut, USA |
| 25.8km (16.0 miles) | ⓘSunset Quartzite Quarry, East Glastonbury, Glastonbury, Hartford County, Connecticut, USA |
| 26.8km (16.6 miles) | ⓘLinkpot cut, Airline Railroad, East Hampton, Middlesex County, Connecticut, USA |
| 31.4km (19.5 miles) | ⓘGreat Hill cobalt mines, Cobalt, East Hampton, Middlesex County, Connecticut, USA |
| 31.8km (19.8 miles) | ⓘCordierite locality (Bigelow Pond), Union, Tolland County, Connecticut, USA |
| 33.4km (20.8 miles) | ⓘAnderson No. 1 Mica Mine, East Hampton, Middlesex County, Connecticut, USA |
| 34.2km (21.2 miles) | ⓘDimension stone quarry, Collins Hill, Portland, Middlesex County, Connecticut, USA |
| References |
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Willimantic, Windham, Windham County, Connecticut, USA