| Locality type: | Occurrence |
| Classification |
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| Species: | Muscovite var: Phengite |
| Formula: | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| Comments: | Two different types of phengite are observed in the host rock and as inclusions in pyrope crystals.
The white mica, occurring as inclusions in pyrope, is a Fe-free phengite ascribable to an intermediate member of the solid-solution series aluminoceladonite-muscovite. A typical composition, represented by the empirical formula K0.93Na0.02(Al1.41Mg0.59)(Si3.60Al0.40O10)(OH)2, is reported by Chukanov (2014). |
| Confirmation |
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| Validity: | Believed Valid |
| Associated Minerals Based on Photo Data: |
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| Pyrope | ⓘ1 photo of Phengite associated with Pyrope at this locality. |
| Magnesiostaurolite | ⓘ1 photo of Phengite associated with Magnesiostaurolite at this locality. |
| Data |
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| Mineral Data: | Click here to view Phengite data |
| Locality Data: | Click here to view Pratoluogo, Venasca, Cuneo Province, Piedmont, Italy |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 542957 |
| Long-form Identifier: | 1:3:542957:8 |
| GUID (UUID V4): | 11af8cc3-7280-484c-a110-35bdabc8ba12 |
| Nearest other occurrences of Phengite |
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| 9.0km (5.6 miles) | ⓘGilba Valley, Brossasco, Cuneo Province, Piedmont, Italy |
| 19.4km (12.1 miles) | ⓘVerné, Sampeyre, Cuneo Province, Piedmont, Italy |
| 19.9km (12.4 miles) | ⓘPunta Rasciassa, Oncino, Cuneo Province, Piedmont, Italy |
| 20.6km (12.8 miles) | ⓘCastello Oddino quarries, Barge, Cuneo Province, Piedmont, Italy |
| 21.0km (13.0 miles) | ⓘCion quarries, Barge, Cuneo Province, Piedmont, Italy |
| 21.4km (13.3 miles) | ⓘPerrone quarries, Barge, Cuneo Province, Piedmont, Italy |
| 22.1km (13.8 miles) | ⓘRocca del Toro Quarry, Montoso Quarries, Bagnolo Piemonte, Cuneo Province, Piedmont, Italy |
| 22.2km (13.8 miles) | ⓘBalma Oro Quarry, Montoso Quarries, Bagnolo Piemonte, Cuneo Province, Piedmont, Italy |
| 22.3km (13.9 miles) | ⓘPravallino Quarry, Montoso Quarries, Bagnolo Piemonte, Cuneo Province, Piedmont, Italy |
| 22.5km (14.0 miles) | ⓘCassetta Quarry, Montoso Quarries, Bagnolo Piemonte, Cuneo Province, Piedmont, Italy |
| References |
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| Reference Search (possible matching items) |
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 | | Journal (article/letter/editorial) | | constraints are in particular the stability of talc + phengite in the matrix assemblage during decompression...evidence, like the stability of the paragenesis talc±phengite, which is ubiquitous in the matrix surrounding...lenses, layers and boudin trails of a quartz-rich phengite±pyrope±kyanite±talc schist (`pyrope quartzite'...are up to metre-scale lenses of talc±kyanite phengite schist that contains locally clusters of milky...of abundant well-recrystallized quartz, mm-size phengite and kyanite, often ®ner-grained talc, and mm- |
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