Columbite-(Fe) from
Tollgate Quarry (Tollgate Mine; Bidwell Quarry; China-stone Quarry), Middletown, Middlesex County, Connecticut, USA
| Locality type: | Quarry | |
| Classification | ||
|---|---|---|
| Species: | Columbite-(Fe) | |
| Formula: | Fe2+Nb2O6 | |
| Comments: | Dana (1837) gives analytical results: "columbic acid" (a mix of niobic and tantalic acid) 73.90%, "protoxyd of iron" 15.65%, "protoxyd of manganese" 8.00%. The specific gravity was 5.95, now known to corresponding to about 70% niobium to 30% tantalum in the "columbic acid". Later analyses that could separate "columbic acid" into niobium and tantalum oxides confirmed these results. "The china-stone quarry at Middletown has furnished the most extraordinary specimens of columbite yet described in the world. A single group of crystals obtained at this place weighed fourteen pounds. It occurs in crystals disseminated through the feldspar, many of which are very remarkable, not only for their size, but for their perfection of form." (Shepard 1837) Accessory in the quartz-microcline zone, also in fluorapatite aggregates. | |
| Habit: | skeletal, prismatic | |
| Colour: | black with iridescence | |
| Quality for species: | Good crystals or rich for species - important (!) | |
| Abundance at site: | Common | |
| Confirmation | ||
| Validity: | Believed Valid | |
| Associated Minerals Based on Photo Data: | ||
| Albite | ⓘ4 photos of Columbite-(Fe) associated with Albite at this locality. | |
| Fluorapatite | ⓘ1 photo of Columbite-(Fe) associated with Fluorapatite at this locality. | |
| Almandine | ⓘ1 photo of Columbite-(Fe) associated with Almandine at this locality. | |
| Autunite | ⓘ1 photo of Columbite-(Fe) associated with Autunite at this locality. | |
| Microcline | ⓘ1 photo of Columbite-(Fe) associated with Microcline at this locality. | |
| Data | ||
| Mineral Data: | Click here to view Columbite-(Fe) data | |
| Locality Data: | Click here to view Tollgate Quarry (Tollgate Mine; Bidwell Quarry; China-stone Quarry), Middletown, Middlesex County, Connecticut, USA | |
| Photo Gallery | View Gallery (7 photos) | |
| Data Identifiers | ||
| Mindat Occurrence Record ID: | 703708 | |
| Long-form Identifier: | 1:3:703708:5 | |
| GUID (UUID V4): | 65cd4d38-bb75-4151-a725-9b97dddef96e | |
| Nearest other occurrences of Columbite-(Fe) | ||
| 2.5km (1.5 miles) | ⓘWhite Rocks Quarry (Consolidated Quarry), White Rock Mining District, Middletown, Middlesex County, Connecticut, USA | |
| 2.8km (1.8 miles) | ⓘRiverside Quarry (Western Quarry), White Rock Mining District, Middletown, Middlesex County, Connecticut, USA | |
| 4.9km (3.0 miles) | ⓘJohn Salak Quarry, Haddam, Middlesex County, Connecticut, USA | |
| 6.7km (4.1 miles) | ⓘState Forest Quarry No. 2 (State Forest #2 Mica Mine; Carini Quarry), Cobalt, East Hampton (Chatham), Middlesex County, Connecticut, USA | |
| 6.8km (4.2 miles) | ⓘStrickland Quarry, Strickland pegmatite, Collins Hill, Portland, Middlesex County, Connecticut, USA | |
| 7.6km (4.7 miles) | ⓘPenfield Quarry (Oak Leaf Quarry), Portland, Middlesex County, Connecticut, USA | |
| 7.7km (4.8 miles) | ⓘAnderson No. 2 Mica Mine, East Hampton (Chatham), Middlesex County, Connecticut, USA | |
| 7.8km (4.9 miles) | ⓘRock Landing Quarry (Capt. Rohrback Quarry), Haddam Neck, Haddam, Middlesex County, Connecticut, USA | |
| 9.0km (5.6 miles) | ⓘNathan Hall Quarry (Clark Hill Quarry), East Hampton (Chatham), Middlesex County, Connecticut, USA | |
| 9.1km (5.6 miles) | ⓘState Forest Quarry No. 1 (State Forest #1 Quarry; Clark Hill Quarry), East Hampton (Chatham), Middlesex County, Connecticut, USA | |
| References | ||
Tollgate Quarry, Middletown, Middlesex County, Connecticut, USA