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Ferrosaponite from
O & G Southbury Quarry (Silliman Quarry; O & G No. 2 Quarry), Orenaug Hills, Woodbury, Litchfield County, Connecticut, USA
| Locality type: | Quarry | |
| Classification | ||
|---|---|---|
| Species: | Ferrosaponite | |
| Formula: | Ca0.3(Fe2+,Mg,Fe3+)3((Si,Al)4O10)(OH)2 · 4H2O | |
| Formation: | Secondary | |
| Comments: | A late forming, fine-grained, very dark green to black micaceous mineral forming tiny globules or coating other minerals in vesicles in basalt. An SEM-EDS analysis conducted in 2017 concluded the mineral is an Fe-Mg-Ca aluminosilicate. The complete absence of K rules out stilpnomelane, biotite, celadonite. The Ca is too low for pumpellyite or julgoldite. A mindat.org mineral search by chemistry found ferrosaponite as a good match, as are its physical properties and geoenvironment of formation. However, XRD is needed for confirmation. | |
| Habit: | micaceous or foliated globules or coatings | |
| Colour: | very dark green to black | |
| Confirmation | ||
| Validity: | Unconfirmed/Questioned | |
| Associated Minerals Based on Photo Data: | ||
| Prehnite | 6 | |
| Calcite | 3 | |
| Quartz | 2 | |
| Data | ||
| Mineral Data: | Click here to view Ferrosaponite data | |
| Locality Data: | Click here to view O & G Southbury Quarry (Silliman Quarry; O & G No. 2 Quarry), Orenaug Hills, Woodbury, Litchfield County, Connecticut, USA | |
| Photo Gallery | View Gallery (3 photos) | |
| Data Identifiers | ||
| Mindat Occurrence Record ID: | 1095398 | |
| Long-form Identifier: | 1:3:1095398:7 | |
| GUID (UUID V4): | 0 | |
| Nearest other occurrences of Ferrosaponite | ||
| 41.0km (25.4 miles) | ⓘState Route 4 road cut, Farmington, Hartford County, Connecticut, USA | |
| References | ||
O & G Southbury Quarry, Orenaug Hills, Woodbury, Litchfield County, Connecticut, USA