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Bettertonite from
Penberthy Croft Mine, St Hilary, Cornwall, England, UK
| Locality type: | Mine | |
| Classification | ||
|---|---|---|
| Species: | Bettertonite | |
| Formula: | [Al6(AsO4)3(OH)9(H2O)5] · 11H2O | |
| Comments: | It occurs as tufts of white, ultrathin (sub-micrometre) rectangular laths, with lateral dimensions generally <20 μm. The laths are flattened on {010} and exhibit the forms {010}, {100} and {001}. The mineral is associated closely with arsenopyrite, chamosite, liskeardite, pharmacoalumite, pharmacosiderite and quartz. Bettertonite is translucent with a white streak and a vitreous to pearly, somewhat silky lustre. | |
| Quality for species: | Good crystals or rich for species - important (!) | |
| Significance: | Unusual or interesting association, relationships with other species, pseudomorphism etc. - see notes. | |
| Abundance at site: | Rare | |
| Confirmation | ||
| Validity: | Confirmed - Type Locality | |
| Confirmation Methods: | XRD SEM-EDS Raman Spectroscopy | |
| Confirmation Details: | Where Tested and Reference ID: XRD, SEM-EDS, Raman, Mineral Analytik Germany | |
| Associated Minerals Based on Photo Data: | ||
| Quartz | 6 | |
| Chamosite | 4 | |
| Arsenopyrite | 2 | |
| Goethite | 1 | |
| Pharmacosiderite | 1 | |
| Data | ||
| Mineral Data: | Click here to view Bettertonite data | |
| Locality Data: | Click here to view Penberthy Croft Mine, St Hilary, Cornwall, England, UK | |
| Photo Gallery | View Gallery (7 photos) | |
| Data Identifiers | ||
| Mindat Occurrence Record ID: | 926708 | |
| Long-form Identifier: | 1:3:926708:4 | |
| GUID (UUID V4): | 0 | |
| Nearest other occurrences of Bettertonite | ||
| 82.1km (51.0 miles) | ⓘMarke Valley Mine, Upton Cross, Linkinhorne, Cornwall, England, UK | |
| References | ||
Penberthy Croft Mine, St Hilary, Cornwall, England, UK