| Locality type: | Road Cutting |
| Classification |
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| Species: | Harmotome |
| Formula: | Ba2(Si12Al4)O32 · 12H2O |
| Formation: | Primary |
| Comments: | White crystals to about 1 cm, commonly dusted with micro-pyrites. This zeolite has the same morphology as phillipsite, but according to Tschernich's 1992 "Zeolites of the World", harmotome is typical of lead deposits whereas phillipsite occurs in volcanics. This locality is thus favorable for harmotome. Henderson (1979) analyzed crystals and found that "...microprobe analysis shows the Ba:Si ratio to be 1.2:6, and the amounts of K, Na and Ca to be low. This data fits harmotome perfectly, and is not consistent with either phillipsite or wellsite."
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| Habit: | Cruciform Marburg twins, with or without re-entrants, or simpler Morvenite twins. |
| Colour: | white |
| Quality for species: | Good crystals or rich for species - important (!) |
| Abundance at site: | Common |
| Confirmation |
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| Validity: | Confirmed |
| Confirmation Methods: | Ion Microprobe |
| Associated Minerals Based on Photo Data: |
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| Quartz | ⓘ10 photos of Harmotome associated with Quartz at this locality. |
| Pyrite | ⓘ9 photos of Harmotome associated with Pyrite at this locality. |
| Fluorite | ⓘ3 photos of Harmotome associated with Fluorite at this locality. |
| Calcite | ⓘ2 photos of Harmotome associated with Calcite at this locality. |
| Sphalerite | ⓘ2 photos of Harmotome associated with Sphalerite at this locality. |
| Baryte | ⓘ2 photos of Harmotome associated with Baryte at this locality. |
| Heulandite-Ca | ⓘ1 photo of Harmotome associated with Heulandite-Ca at this locality. |
| Albite | ⓘ1 photo of Harmotome associated with Albite at this locality. |
| Data |
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| Mineral Data: | Click here to view Harmotome data |
| Locality Data: | Click here to view Thomaston Dam railroad cut, Thomaston Dam, Thomaston, Litchfield County, Connecticut, USA |
| Photo Gallery | View Gallery (10 photos) |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 37857 |
| Long-form Identifier: | 1:3:37857:6 |
| GUID (UUID V4): | 134be62d-5a61-4577-9c78-98852492204d |
| Nearest other occurrences of Harmotome |
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| 57.8km (35.9 miles) | ⓘState Route 57 zeolite occurrence (Georgetown locality; Connerie's store), Redding (Reading), Fairfield County, Connecticut, USA |
| 89.0km (55.3 miles) | ⓘNew York City Aquaduct openings, Ossining (Sing Sing), Westchester County, New York, USA |
| 89.0km (55.3 miles) | ⓘOssining (Sing Sing), Westchester County, New York, USA |
| 93.8km (58.3 miles) | ⓘHaverstraw, Rockland County, New York, USA |
| References |
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Thomaston Dam railroad cut, Thomaston Dam, Thomaston, Litchfield County, Connecticut, USA