Ankerite from
Phoenixville tunnel (Conrail tunnel; Black Rock tunnel), Phoenixville, Schuylkill Township, Chester County, Pennsylvania, USA
| Locality type: | Tunnel | |
| Classification | ||
|---|---|---|
| Species: | Ankerite | |
| Formula: | Ca(Fe2+,Mg)(CO3)2 | |
| Comments: | Benchmark chemical analysis of samples by W.P. Headden as reported in the 1874 Second Geological Survey of Pennsylvania, by F. A. Genth. Often occuring with a brown superficial coating, frequently associated with Pyrite crystals. I.D. noted as doubtful by A. Montgomery, Min PA, 1922-69. discredited status contested by A. Heyl in USGS study 1984 (MinRec v20 #5 pg. 377) Published analysis, in Montgomery, "Mineralogy of Pennsylvania," 1922, gives Ca(Mg0.63Fe0.37)(CO3)2, suggesting the mineral is Fe-containing dolomite. Heyl's report not examined, could be from a legitimate ankerite, however. | |
| Habit: | curved Rombohedral xtls | |
| Colour: | Yellowish white, frequently with a brown superficial coating | |
| Quality for species: | Good crystals or rich for species - important (!) | |
| Confirmation | ||
| Validity: | Unconfirmed/Questioned | |
| Associated Minerals Based on Photo Data: | ||
| Quartz | ⓘ1 photo of Ankerite associated with Quartz at this locality. | |
| Data | ||
| Mineral Data: | Click here to view Ankerite data | |
| Locality Data: | Click here to view Phoenixville tunnel (Conrail tunnel; Black Rock tunnel), Phoenixville, Schuylkill Township, Chester County, Pennsylvania, USA | |
| Data Identifiers | ||
| Mindat Occurrence Record ID: | 239712 | |
| Long-form Identifier: | 1:3:239712:2 | |
| GUID (UUID V4): | 4d3b7df8-2ea1-43e3-9e1a-89a378bff6b4 | |
| Nearest other occurrences of Ankerite | ||
| 4.4km (2.8 miles) | ⓘWheatley Mines, Schuylkill Township, Chester County, Pennsylvania, USA | |
| 5.0km (3.1 miles) | ⓘBrookdale Mine, Schuylkill Township, Chester County, Pennsylvania, USA | |
| 6.6km (4.1 miles) | ⓘEcton Mine, Perkiomen Mines, Audubon, Lower Providence Township, Montgomery County, Pennsylvania, USA | |
| 17.6km (10.9 miles) | ⓘFrench Creek Mines, Saint Peters, Warwick Township, Chester County, Pennsylvania, USA | |
| 22.2km (13.8 miles) | ⓘDownington, East Caln Township, Chester County, Pennsylvania, USA | |
| 23.7km (14.7 miles) | ⓘPrince's Soapstone Quarry, Lafayette Station, Philadelphia County, Pennsylvania, USA | |
| 34.6km (21.5 miles) | ⓘDoan's Lead Mine (New Britain Mine), New Galena, New Britain Township, Bucks County, Pennsylvania, USA | |
| 89.0km (55.3 miles) | ⓘDinning Rutile prospect, Clermont Mills, Harford County, Maryland, USA | |
| References | ||
Phoenixville tunnel, Phoenixville, Schuylkill Township, Chester County, Pennsylvania, USA