väyrynenite

{{Infobox mineral | name = Väyrynenite | image = Vayrynenite-177599.jpg | alt = | caption = Väyrynenite (size: 1.7 x 1.4 x 0.6 cm) | category = Phosphate mineral | formula = MnBe(PO4)(OH,F) | IMAsymbol = Väy | molweight = | strunz = 8.BA.05 | dana = | system = Monoclinic | class = Prismatic (2/m) (same H-M symbol) | symmetry = P21/a | unit cell = a = 5.411(5) Å, b = 14.49(2) Å, c = 4.73 Å; β = 102.75°; Z = 4 | color = Light pink to rose-red, salmon pink, pale gray, brown | colour = | habit = Rare as elongated and striated prismatic crystals; fine-grained aggregates | twinning = | cleavage = Perfect on {010}, good on {100}, fair on {001} | fracture = Uneven | tenacity = Brittle | mohs = 5 | luster = Vitreous | streak = White | diaphaneity = Transparent to translucent | gravity = 3.22 | density = | polish = | opticalprop = Biaxial (–) | refractive = nα = 1.638 - 1.640 nβ = 1.658 - 1.662 nγ = 1.664 - 1.667 | birefringence = δ = 0.026 - 0.027 | pleochroism = Visible X= orangish, Y= red, Z= dark red | 2V = 46°–55° | dispersion = r > v moderate | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | prop1 = | prop1text = | references = }} Väyrynenite is a rare phosphate mineral with formula MnBe(PO4)(OH,F). It was first described in 1954 for an occurrence in Viitaniemi, Erajarvi, Finland and named for mineralogist Heikki Allan Väyrynen of Helsinki, Finland.

It occurs in pegmatites as an alteration of beryl and triphylite. It occurs in association with eosphorite, moraesite, hurlbutite, beryllonite, amblygonite, apatite, tourmaline, topaz, muscovite, microcline and quartz.