Abstract
Krinovite, a meteoritic silicate mineral with ideal crystal chemical formula Na2Mg4Cr2[Si6O18]O2, is triclinic, space group P[unk], with a = 10.238(4), b = 10.642(4), c = 8.780(3) Å, α = 105.15(3)°, β = 96.50(4)°, γ = 125.15(3)°. The crystal structure of krinovite has been refined to R = 0.065, Rw = 0.067 for 1661 independent reflections. Krinovite is a member of the aenigmatite group, and is characterized by octahedral walls connected through tetrahedral chains with appendices and additional insular octahedra.
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