Abstract
Kesebolite-(Ce), ideal formula CeCa2Mn(AsO4)[SiO3]3, is a new mineral (IMA No. 2019-097) recovered from mine dumps at the Kesebol Mn-(Fe-Cu) deposit in Västra Götaland, Sweden. It occurs with rhodonite, baryte, quartz, calcite, talc, andradite, rhodochrosite, K-feldspar, hematite, gasparite-(Ce), chernovite-(Y) and ferriakasakaite-(Ce). It forms mostly euhedral crystals, with lengthwise striation. The mineral is dark grayish-brown to brown, translucent, with light brown streak. It is optically biaxial (+), with weak pleochroism, and ncalc = 1.74. H = 5–6 and VHN100 = 825. Fair cleavage is observed on {100}. The calculated density is 3.998(5) g·cm−3. Kesebolite-(Ce) is monoclinic, P21/c, with unit-cell parameters from X-ray single-crystal diffraction data: a = 6.7382(3), b = 13.0368(6), c = 12.0958(6) Å, β = 98.578(2)°, and V = 1050.66(9) Å3, with Z = 4. Strongest Bragg peaks in the X-ray powder pattern are: [I(%), d(Å) (hkl)] 100, 3.114 (20-2); 92, 2.924 (140); 84, 3.138 (041); 72, 2.908 (014); 57, 3.228 (210); 48, 2.856 (042); 48, 3.002 (132). The unique crystal structure was solved and refined to R1 = 4.6%. It consists of 6-periodic single silicate chains along (001); these are interconnected to infinite (010) strings of alternating, corner-sharing MnO6 and AsO4 polyhedra, altogether forming a trellis-like framework parallel to (100).
Highlights
Manganese-arsenosilicates form rare kinds of minerals with ca. 20 species known to date
The new mineral species and its name were approved by the Commission on New Minerals, Nomenclature and Classification, International Mineralogical
The name is for the discovery locality, the Kesebol mine, in the Åmål municipality, Västra Götaland, Sweden
Summary
Manganese-arsenosilicates form rare kinds of minerals with ca. 20 species known to date. Manganese-arsenosilicates form rare kinds of minerals with ca. Most of them are typical products of late-stage mineralization in hydrothermally reworked Mn deposits. We present the description of the first nominally Ca and REE-bearing mineral belonging to this category, kesebolite-(Ce), ideally CeCa2 Mn(AsO4 )[SiO3 ]3. The new mineral species and its name were approved by the Commission on New Minerals, Nomenclature and Classification, International Mineralogical. The name is for the discovery locality, the Kesebol mine, in the Åmål municipality, Västra Götaland, Sweden Kesebol, pronounced [Ce:sebu:l] with a “soft” Swedish k, is the name of a nearby farm. The holotype specimen of kesebolite-(Ce) is preserved in the type mineral collection of the Department of Geosciences, Swedish Museum of Natural History, Box 50007, SE-10405 Stockholm, Sweden, under collection no.
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