Chondrodite from
Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
| Locality type: | Mine | |
| Classification | ||
|---|---|---|
| Species: | Chondrodite | |
| Formula: | Mg5(SiO4)2F2 | |
| Comments: | World famous sharp, transparent crystals. The Tilly Foster "signature mineral". In 1873 Bridenbaugh described it "as by far the most interesting species found at this locality" (p. 212). E. S. Dana published two detailed papers on the mineral in 1875. In 1938 Trainer described the chondrodite found here as the "finest mineral from Tilly Foster ... The fine crystals are "antiques" for which you pay fancy prices" (p. 297). The deep red crystals found here are unique in their brilliance, clarity, size, perfection, and variety of forms. Various degrees of serpentinization of these crystals are common. It also was abundant in massive form, and in grains within the magnetite ore. Miners referred to "yellow ore" as magnetite with yellow chondrodite; where the chondrodite was altered to serpentine the ore was referred to as "blue ore" | |
| Habit: | complex, multi-formed | |
| Colour: | Deep wine red, orange, red-brown. | |
| Quality for species: | Excellent - world class for species or very significant. (!!) | |
| Abundance at site: | Common | |
| Confirmation | ||
| Validity: | Believed Valid | |
| Associated Minerals: | ||
| Associates: | Dolomite | |
| Associated Minerals Based on Photo Data: | ||
| Magnetite | 108 | |
| Clinochlore | 107 | |
| Calcite | 55 | |
| Lizardite | 25 | |
| Tremolite | 16 | |
| Antigorite | 16 | |
| Dolomite | 15 | |
| Hydromagnesite | 8 | |
| Pyrrhotite | 7 | |
| Diopside | 6 | |
| Serpentine Subgroup | 6 | |
| Phlogopite | 5 | |
| Brucite | 5 | |
| Muscovite | 4 | |
| Spinel | 4 | |
| Mica Group | 3 | |
| Chrysotile | 2 | |
| Hematite | 1 | |
| Arsenopyrite | 1 | |
| Grossular | 1 | |
| Chalcopyrite | 1 | |
| Talc | 1 | |
| Riebeckite | 1 | |
| Data | ||
| Mineral Data: | Click here to view Chondrodite data | |
| Locality Data: | Click here to view Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA | |
| Photo Gallery | View Gallery (100 photos) | |
| Data Identifiers | ||
| Mindat Occurrence Record ID: | 3591 | |
| Long-form Identifier: | 1:3:3591:0 | |
| GUID (UUID V4): | 0 | |
| Nearest other occurrences of Chondrodite | ||
| 10.1km (6.2 miles) | ⓘMahopac Mines, Town of Carmel, Putnam County, New York, USA | |
| 15.5km (9.6 miles) | ⓘNorth Street mall, Danbury, Fairfield County, Connecticut, USA | |
| 21.0km (13.1 miles) | ⓘU. S. Route 7 Expressway (Danbury line to Iron Works District), Brookfield, Fairfield County, Connecticut, USA | |
| 26.3km (16.4 miles) | ⓘAdvance Stone Quarry, Boardman's Bridge, New Milford, Litchfield County, Connecticut, USA | |
| 30.7km (19.1 miles) | ⓘBog Meadow Pond, Town of Highlands, Orange County, New York, USA | |
| 38.8km (24.1 miles) | ⓘTwin Lakes, Woodbury, Orange County, New York, USA | |
| 45.4km (28.2 miles) | ⓘGreenwood Furnace, Arden (Greenwood), Orange County, New York, USA | |
| 46.0km (28.6 miles) | ⓘVillage of Monroe, Town of Monroe, Orange County, New York, USA | |
| 47.4km (29.5 miles) | ⓘO'Neil Mine, Lake Mombasha, Town of Monroe, Orange County, New York, USA | |
| 66.0km (41.0 miles) | ⓘEdenville, Town of Warwick, Orange County, New York, USA | |
| References | ||
Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA