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Mineralogical ClassificationByrudite IMA2013-045 published
26th May 2015 15:32 UTCChris Stanley Expert
Byrudite (IMA 2013-045, Raade et al., 2013), with simplified formula (Be,&)(V3+,Ti)3O6, occurs in
emerald-bearing syenitic pegmatites of Permian age at Byrud farm, Eidsvoll, Akershus, South Norway. It has a norbergite-type structure, Pnma, with a = 9.982(1), b = 8.502(1), c = 4.5480(6) A ˚ , V = 385.97(9) A ˚ 3, Z = 4. The structure was refined to R1 = 0.045 for 1413 unique reflections. Twinning
occurs on {210}. The occupancy of the tetrahedral Be site refined to 0.84(1). The presence of Be was verified by secondary ion mass spectrometry but could not be quantified. Electron-microprobe analyses of the crystal used for structure determination gave the empirical formula (Be0.84&0.16)(V3+ 1.32Ti1.25Cr0.29Fe0.09Al0.07)S3.02O6. There is a strong inverse correlation between V and Cr. The ideal endmember formula is BeV3+2 TiO6. The mineral is black and opaque with a metallic lustre. Reflectance data in air are reported from 400 to 700 nm. The Commission on Ore Mineralogy required wavelengths are [R1,R2(l in nm)]:16.6,17.5(470), 16.7,17.9(546), 16.8,18.3(589) and 16.8,18.6(650).The Mohs hardness is ~7, based on indentation measurements. The mineral is brittle with an uneven fracture; cleavage is not present. D(calc.) = 4.35 g cm3 for the empirical formula with 0.84 Be a.p.f.u. The strongest reflections of the calculated powder X-ray diffraction pattern are [d in A ˚ (Irel)(hkl)]: 3.721(72)(111), 2.965(100)(121), 2.561(50)(311), 2.464(41)(230), 2.167(24)(231), 1.681(34)(402), 1.671(66)(232), 1.435(23)(630).
2nd Jun 2015 10:44 UTCKnut Edvard Larsen 🌟 Manager
The reference is
Raade, G., Balić-Žunić, T. and Stanley, C.J. (2015): Byrudite, (Be,□)(V3+,Ti)3O6, a new mineral from the Byrud emerald mine, South Norway. Mineralogical Magazine, 79, 261-268
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