| Locality type: | Quarry |
| Classification |
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| Species: | Epididymite |
| Formula: | Na2Be2Si6O15 · H2O |
| Comments: | Undoubtedly the best crystallized specimens for the species. |
| Habit: | Groups of short prismatic crystals, very often forming cyclic pseudohexagonal twins; tabular, bladed, acicular, reticulated |
| Colour: | Colourless to translucent white. |
| Luminescent properties: | Some fluoresce medium to strong green, yellowish-green and pale yellow under SW UV. |
| Quality for species: | Excellent - world class for species or very significant. (!!) |
| Abundance at site: | Common |
| Confirmation |
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| Validity: | Believed Valid |
| Associated Minerals Based on Photo Data: |
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| Aegirine | 33 |
| Albite | 25 |
| Catapleiite | 24 |
| Serandite | 24 |
| Eudidymite | 16 |
| Calcite | 12 |
| Microcline | 12 |
| Natrolite | 11 |
| Gaidonnayite | 11 |
| Manganoneptunite | 8 |
| Nenadkevichite | 7 |
| Polylithionite | 6 |
| Fluorite | 6 |
| Quartz | 6 |
| - var Smoky Quartz | 3 |
| Analcime | 5 |
| Pyrite | 4 |
| Rhodochrosite | 4 |
| Siderite | 3 |
| Fluorapatite | 3 |
| Fluorcalciopyrochlore | 3 |
| Sodalite | 2 |
| Gonnardite | 2 |
| Dolomite | 2 |
| Elpidite | 1 |
| Genthelvite | 1 |
| Garronite-Na | 1 |
| Franconite | 1 |
| Petarasite | 1 |
| Muscovite | 1 |
| Parisite-(Ce) | 1 |
| Beryllonite | 1 |
| Synchysite-(Ce) | 1 |
| Labuntsovite-Mn | 1 |
| Data |
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| Mineral Data: | Click here to view Epididymite data |
| Locality Data: | Click here to view Poudrette quarry (De-Mix quarry; Demix quarry; Uni-Mix quarry; Carrière Mont Saint-Hilaire; MSH), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada |
| Photo Gallery | View Gallery (103 photos) |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 4912 |
| Long-form Identifier: | 1:3:4912:2 |
| GUID (UUID V4): | 0 |
| Nearest other occurrences of Epididymite |
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| 19.5km (12.1 miles) | ⓘDemix-Varennes quarry, Saint-Amable sill, Varennes & St-Amable, Lajemmerais RCM, Montérégie, Québec, Canada |
| References |
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Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada