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Formula: BeMn2+(PO4)(OH)
Anhydrous phosphate containing hydroxyl, beryllium- and
manganese- bearing mineral
Crystal System: Monoclinic
Specific gravity: 3.22
Hardness: 5
Streak: White
Colour: Light pink to rose-red, salmon pink, pale grey, brown
Environments:
Väyrynenite is a rare late-forming mineral in complex granitic pegmatites; it
commonly occurs as an alteration product of beryllonite according to the sequence
beryllonite→hurlbutite→
hydroxylherderite→väyrynenite or as an alteration product of
beryl and triphylite. Associated minerals include
beryllonite, eosphorite,
moraesite, hurlbutite,
hydroxylherderite, amblygonite-
fairfieldite, eosphorite-
childrenite, apatite,
microcline, muscovite,
tourmaline, quartz,
topaz and cassiterite
(R&M 87.3.281, Mindat, HOM).
Localities
At the type locality, the Viitaniemi pegmatite, Eräjärvi area, Orivesi, Pirkanmaa, Finland, väyrynenite occurs in a
granite pegmatite associated with
herderite, hurlbutite,
beryllonite, tourmaline,
quartz, topaz, muscovite variety
gilbertite, microcline,
morinite, eosphorite,
cassiterite, apatite and
amblygonite
(AM 41.437, Mindat, Dana).
At the Estes Quarry, West Baldwin, Baldwin, Cumberland county, Maine, USA, väyrynenite has been found in a pegmatite associated
with siderite, a roscherite-group mineral,
childrenite-eosphorite,
microcline, albite and
quartz
(R&M 87-3.281).
At the Emmons pegmatite, Greenwood, Oxford county, Maine, USA, väyrynenite masses to 1 cm across are associated with
beryllonite, hydroxylherderite and
moraesite. The Emmons pegmatite is situated in a belt of metasedimentary rocks which originated
as marine sediments which were subsequently deformed and metamorphosed. The Emmons pegmatite is a highly evolved
boron-lithium-cesium-tantalum
enriched pegmatite
(R&M 94.6.517).
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