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• W2140739895 abstract "Abstract Alumoåkermanite, (Ca,Na) 2 (Al,Mg,Fe 2+ )(Si 2 O 7 ), is a new mineral member of the melilite group from the active carbonatite-nephelinite-phonolite volcano Oldoinyo Lengai, Tanzania. The mineral occurs as tabular phenocrysts and microphenocrysts in melilite-nephelinitic ashes and lapilli-tuffs. Alumoåkermanite is light brown in colour; it is transparent, with a vitreous lustre and the streak is white. Cleavages or partings are not observed. The mineral is brittle with an uneven fracture. The measured density is 2.96(2) g/cm 3 . The Mohs hardness is ~4.5–6. Alumoåkermanite is uniaxial (–) with ω = 1.635(1) and ε = 1.624–1.626(1). In a 30 mm thin section (+N), the mineral has a yellow to orange interference colour, straight extinction and positive elongation, and is nonpleochroic. The average chemical formula of the mineral derived from electron microprobe analyses is: (Ca 1.48 Na 0.50 Sr 0.02 K 0.01 ) (Si 1.99 Al 0.01 O 7 ). Alumoåkermanite is tetragonal, space group P 42 1 m with a = 7.7661(4) Å, c = 5.0297(4) Å, V = 303.4(1) Å 3 and Z = 2. The five strongest powder-diffraction lines [ d in Å, ( I/I o ), hkl ] are: 3.712, (13), (111); 3.075, (25), (201); 2.859, (100), (211); 2.456, (32), (311); 1.757, (19), (312). Single-crystal structure refinement ( R 1 = 0.018) revealed structure topology typical of the melilite-group minerals, i.e. tetrahedral [(Al,Mg)(Si 2 O 7 )] sheets interleaved with layers of (CaNa) cations. The name reflects the chemical composition of the mineral." @default.
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• W2140739895 date "2009-06-01" @default.
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• W2140739895 title "Alumoåkermanite, (Ca,Na)₂(Al,Mg,Fe²⁺)(Si₂O₇), a new mineral from the active carbonatite-nephelinite-phonolite volcano Oldoinyo Lengai, northern Tanzania" @default.
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• W2140739895 doi "https://doi.org/10.1180/minmag.2009.073.3.373" @default.
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