Väyrynenite
(repeating unit)MnBe(PO4)(OH,F) IMA symbol Väy[1] Strunz classification 8.BA.05 Crystal system Monoclinic Crystal class Prismatic (2/m)
(same H-M symbol) Space group P21/a Unit cell a = 5.411(5) Å,
b = 14.49(2) Å,
c = 4.73 Å;
β = 102.75°; Z = 4 Identification Color Light pink to rose-red, salmon pink, pale gray, brown Crystal habit Rare as elongated and striated prismatic crystals; fine-grained aggregates Cleavage Perfect on {010}, good on {100}, fair on {001} Fracture Uneven Tenacity Brittle Mohs scale hardness 5 Luster Vitreous Streak White Diaphaneity Transparent to translucent Specific gravity 3.22 Optical properties Biaxial (–) Refractive index 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 angle 46°–55° Dispersion r > v moderate References [2][3][4]
(same H-M symbol)
b = 14.49(2) Å,
c = 4.73 Å;
β = 102.75°; Z = 4
Väyrynenite is a rare phosphate mineral with formula MnBe(PO4)(OH,F).[2] It was first described in 1954 for an occurrence in Viitaniemi, Erajarvi, Finland and named for mineralogist Heikki Allan Väyrynen of Helsinki, Finland.[4]
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.[4]
References
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ a b Väyrynenite on Mindat.org
- ^ Väyrynenite data on Webmineral
- ^ a b c Väyrynenite data from the Handbook of Mineralogy
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