Log In
Cronstedtite from
Old Mine Park (Old Tungsten Mine), Long Hill, Trumbull, Fairfield County, Connecticut, USA
| Locality type: | Park | |
| Classification | ||
|---|---|---|
| Species: | Cronstedtite | |
| Formula: | Fe22+Fe3+((Si,Fe3+)2O5)(OH)4 | |
| Comments: | This is all the information provided by Hoadley on the purported cronstedtite: "On a recent trip of the New York Mineralogical Club, under the guidance of the writer, to the Hubbard tungsten mine at Long Hill (Trumbull Township), Connecticut, Mr. George E. Ashby found a specimen of a chlorite, determined by Mr. Lazard Cahn as cronstedtite, 4FeO.2Fe2O3.3SiO2.4H2O. The specimen shows a group of black crystals 1/8 inch in diameter with perfect basal cleavage, hardness = 3.5, and rhombohedral hemimorphic, with the forms c (0001) and x (bar2021). This is believed to be the first occurrence of the mineral in the United States..." Identity questioned by Manchester (1931), p. 38. Description sounds like the common clinochlore found here. | |
| Habit: | rhombohedral hemimorphic, with the forms c (0001) and x (bar2021) | |
| Colour: | black | |
| Abundance at site: | Extremely Rare | |
| Confirmation | ||
| Validity: | Unconfirmed/Questioned | |
| Data | ||
| Mineral Data: | Click here to view Cronstedtite data | |
| Locality Data: | Click here to view Old Mine Park (Old Tungsten Mine), Long Hill, Trumbull, Fairfield County, Connecticut, USA | |
| Data Identifiers | ||
| Mindat Occurrence Record ID: | 131473 | |
| Long-form Identifier: | 1:3:131473:1 | |
| GUID (UUID V4): | 0 | |
| Nearest other occurrences of Cronstedtite | ||
| 61.5km (38.2 miles) | ⓘState Route 9 rock cuts, Haddam, Middlesex County, Connecticut, USA | |
| References | ||
