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Manganonewberyite, Mn(PO3OH)(H2O)3, the manganese analogue of newberyite from the Cassagna mine, Italy

Published online by Cambridge University Press:  02 January 2025

Anthony R. Kampf Open the ORCID record for Anthony R. Kampf [Opens in a new window] ,
Chi Ma Open the ORCID record for Chi Ma [Opens in a new window]  and
Fabrizio Castellaro Open the ORCID record for Fabrizio Castellaro [Opens in a new window]
Anthony R. Kampf*
Affiliation:
Mineral Sciences Department, Natural History Museum of Los Angeles County, Los Angeles, CA, USA
Chi Ma
Affiliation:
Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA;
Fabrizio Castellaro
Affiliation:
Independent researcher, Mezzanego, GE, Italy
*
Corresponding author: Anthony R. Kampf; Email: [email protected]
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Abstract

The new mineral manganonewberyite (IMA2024–004), Mn(PO3OH)(H2O)3, was found underground at the Cassagna mine, Liguria, Italy, where it is a secondary phase formed by the interaction of bat guano with Mn-rich rock. Manganonewberyite occurs with niahite, kutnohorite, sampleite and serrabrancaite on a tinzenite–quartz–braunite matrix. Crystals are prisms and blades, up to ∼0.15 mm long, elongated parallel to [001], flattened on {100} and exhibiting the forms {100}, {010} and {111}. Crystals are colourless and transparent, with vitreous lustre and white streak. The mineral is brittle with curved fracture. The Mohs hardness is ∼3. Cleavage is perfect on {010}. The density is 2.34(2) g·cm–3. Optically, manganonewberyite is biaxial (+) with α = 1.541(2), β = 1.547(2) and γ = 1.559(2) (white light). The 2V is 71.6(3)°. The optical orientation is X = a, Y = b and Z = c. The empirical formula is (Mn0.960Mg0.016Ca0.015)Σ0.991(H1.02P1.00O4)(H2O)3. Manganonewberyite is orthorhombic, space group Pbca, with cell parameters: a = 10.4273(6), b = 10.8755(8), c = 10.2126(4) Å, V = 1158.13(11) Å3 and Z = 8. The crystal structure (R1 = 2.79% for 892 I > 2σI reflections) is the same as that of newberyite with Mn in place of Mg.

Keywords

manganonewberyitenew mineralnewberyitecrystal structureRaman spectroscopyCassagna mineLiguriaItaly
Type
Article
Information
Mineralogical Magazine , First View , pp. 1 - 7
Copyright
© The Author(s), 2025. Published by Cambridge University Press on behalf of The Mineralogical Society of the United Kingdom and Ireland.

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Footnotes

Associate Editor: David Hibbs

References

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