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Isokite from
Assunção Mine, Aldeia Nova, Ferreira de Aves, Sátão, Viseu, Portugal
| Locality type: | Mine | |
| Classification | ||
|---|---|---|
| Species: | Isokite | |
| Formula: | CaMg(PO4)F | |
| Comments: | Isokite, CaMg[F|PO4], from Senhora de Assunção, Portugal: New Find and new Data (2008). Rupert Hochleitner and Karl Thomas Fehr, München. Abstract: Isokite, CaMg[F|PO4], from a newly discovered occurrence in the pegmatite of Senhora de Assunção, Portugal, is described. In contradiction to previous descriptions (Deans et al. 1955, Fisher 1957, Deans 1958 ) the newly found isokite does not form whitish earthy crusts but massive brownish or greyish masses and veins in contact to triplite. Paragenesis and age relations show that Assunção isokite grows at the expense of earlier formed triplite. The FTIR spectrum of isokite is presented for the first time (observed bands at 456, 475, 564, 594, 649, 952, 1005, 1039, 1075, 1124 cm-1) , chemical and X-ray diffraction data are given (a = 6.527±0.005 Å, b = 8.744±0.005 Å, c = 7.501±0.006 Å and β = 121.34±0.009 °) and the formation of isokite in pegmatites is discussed. | |
| Confirmation | ||
| Validity: | Confirmed | |
| Confirmation Methods: | XRD | |
| Confirmation Details: | Where Tested and Reference ID: Rui Nunes collection | |
| Associated Minerals Based on Photo Data: | ||
| Triplite | 2 | |
| Data | ||
| Mineral Data: | Click here to view Isokite data | |
| Locality Data: | Click here to view Assunção Mine, Aldeia Nova, Ferreira de Aves, Sátão, Viseu, Portugal | |
| Photo Gallery | View Gallery (4 photos) | |
| Data Identifiers | ||
| Mindat Occurrence Record ID: | 367813 | |
| Long-form Identifier: | 1:3:367813:8 | |
| GUID (UUID V4): | 0 | |
| Nearest other occurrences of Isokite | ||
| 12.2km (7.6 miles) | ⓘVenturinha, Sezures, Penalva do Castelo, Viseu, Portugal | |
| 28.5km (17.7 miles) | ⓘCubos-Mesquitela-Mangualde area, Mangualde (Mesquitela e Cunha Alta), Mangualde, Viseu, Portugal | |
| 36.1km (22.4 miles) | ⓘSítio do Castelo Mine, Folgosinho, Gouveia, Guarda, Portugal | |
| 74.9km (46.5 miles) | ⓘBarroca Grande Mine, Aldeia de São Francisco de Assis, Covilhã, Castelo Branco, Portugal | |
| References | ||
Assunção Mine, Aldeia Nova, Ferreira de Aves, Sátão, Viseu, Portugal