Tephroite from
Jail Hill Road locality (Jail Hill Quarry), Haddam, Middlesex County, Connecticut, USA
| Classification | ||
|---|---|---|
| Species: | Tephroite | |
| Formula: | Mn22+SiO4 | |
| Comments: | Reported by Dick Schooner. Specimens mostly are pure masses of anhedral grains, or scattered grains associated with bustamite and spessartine, all with black staining. According to Schooner: "Several bodies of more complex mineralogy, within the spessartine, consisted for the most part of brownish tephroite, intimately intergrown with dolomite and kutnohorite, as well as yellow spessartine, alleghanyite, jacobsite, pyrophanite, etc. A few solid dark gray resinous-looking cleavages, up to an inch, were obtained. The main concentration was eventually removed as a boulder, over two feet in diameter, which may well hold the world's record for toughness; it took the author two days of steady pounding to reduce it!" | |
| Habit: | anhedral | |
| Colour: | tan, brown, dark brown | |
| Quality for species: | Poor for species, only of interest for locality collectors. (#) | |
| Abundance at site: | Rare | |
| Confirmation | ||
| Validity: | Believed Valid | |
| Associated Minerals Based on Photo Data: | ||
| Spessartine | β3 photos of Tephroite associated with Spessartine at this locality. | |
| Jacobsite | β2 photos of Tephroite associated with Jacobsite at this locality. | |
| Bustamite | β2 photos of Tephroite associated with Bustamite at this locality. | |
| Hyalophane | β1 photo of Tephroite associated with Hyalophane at this locality. | |
| Rhodochrosite | β1 photo of Tephroite associated with Rhodochrosite at this locality. | |
| Pyroxmangite | β1 photo of Tephroite associated with Pyroxmangite at this locality. | |
| Calcite | β1 photo of Tephroite associated with Calcite at this locality. | |
| Pyrophanite | β1 photo of Tephroite associated with Pyrophanite at this locality. | |
| Actinolite | β1 photo of Tephroite associated with Actinolite at this locality. | |
| Data | ||
| Mineral Data: | Click here to view Tephroite data | |
| Locality Data: | Click here to view Jail Hill Road locality (Jail Hill Quarry), Haddam, Middlesex County, Connecticut, USA | |
| Data Identifiers | ||
| Mindat Occurrence Record ID: | 238816 | |
| Long-form Identifier: | 1:3:238816:8 | |
| GUID (UUID V4): | 9816adf6-a777-442f-89dd-aaed790c6a27 | |
| References | ||
Jail Hill Road locality, Haddam, Middlesex County, Connecticut, USA