Prismatine from
Stakholmen quarry, Hassela, Nordanstig, Gävleborg County, Sweden
| Locality type: | Quarry | |
| Classification | ||
|---|---|---|
| Species: | Prismatine | |
| Formula: | (◻,Fe,Mg)(Mg,Al,Fe)5Al4Si2(Si,Al)2(B,Si,Al)(O,OH,F)22 | |
| Formation: | Primary | |
| Comments: | Jonsson (1996) says "Prismatine occurs at Stakholmen as elongated, rough, prismatic crystals of a generally grey or greyish white colour, more rarely green or purplish grey. […] In most of the investigated specimens, prismatine is intimately intergrown in a medium- to coarse-grained white or colourless to light tan mass mainly composed of subhedral sheaves of white enstatite, white, sheafy talc and a light brownish phlogopitic mica. Dravite, quartz and plagioclase occur as slightly less common constituents of this assemblage. In some samples, a disequilibrium texture with prismatine being rimmed by dravite is apparent" | |
| Habit: | Elongated rough, prismatic crystals arranged in divering aggregates or subparallell bundles | |
| Colour: | Grey to greyish white | |
| Luminescent properties: | Yellow best under MW | |
| Quality for species: | Excellent - world class for species or very significant. (!!) | |
| Abundance at site: | Common | |
| Confirmation | ||
| Validity: | Believed Valid | |
| Associated Minerals Based on Photo Data: | ||
| Enstatite | 12 | |
| Phlogopite | 8 | |
| Talc | 6 | |
| Data | ||
| Mineral Data: | Click here to view Prismatine data | |
| Locality Data: | Click here to view Stakholmen quarry, Hassela, Nordanstig, Gävleborg County, Sweden | |
| Photo Gallery | View Gallery (17 photos) | |
| Data Identifiers | ||
| Mindat Occurrence Record ID: | 96603 | |
| Long-form Identifier: | 1:3:96603:4 | |
| GUID (UUID V4): | 0 | |
| References | ||
Jonsson, E. (1996) The first occurrence of a kornerupine‐group mineral in Sweden: Prismatine from Stakholmen, Hälsingland. GFF, 118. 52-53 doi:10.1080/11035899609546333 Grew, Edward S.; Pertsev, Nikolai N.; Vrána, Stanislav; Yates, Martin G.; Shearer, Charles K.; Wiedenbeck, Michael (1998) Kornerupine parageneses in whiteschists and other magnesian rocks: is kornerupine + talc a high-pressure assemblage equivalent to tourmaline + orthoamphibole? Contributions to Mineralogy and Petrology, 131 (1). 22-38 doi:10.1007/s004100050376 | ||
Stakholmen quarry, Hassela, Nordanstig, Gävleborg County, Sweden