Borate sulfates are mixed anion compounds containing separate borate and sulfate anions. They are distinct from the borosulfates where the borate is linked to a sulfate via a common oxygen atom.
List chemmwcrystal system space groupunit cell ÅvolumedensitycommentreferencessulfoboriteorthorhombicPnmaa=10.132, b=12.537, c=7.775987.6Biaxial (-) n=1.527, n=1.536, n=1.551
2V 79°
Max birefringence δ=0.024HeidornitemonoclinicC2/ca=10.19, b=7.76, c=18.81 β=93.33° Z=41,4852.753Biaxial (+) n=1.579, n=1.588, n=1.604
2V 63° to 77°
Max birefringence δ=0.025CharlesitetrigonalP31ca = 11.161, c = 21.2122,2881.77Uniaxial (-) n=1.492(3), n=1.475(3)
Max birefringence δ=0.017VitimitemonoclinicP2/ma=14.10, b=19.53, c=14.05 β=120.39° Z=43,337Biaxial (-) n=1.532(3), n=1.537(1), n=1.540(1)
Max birefringence δ=0.008HarkeritetrigonalRma=18.131 α=33.46°1,614Uniaxial n=, n=TatarinoviteHexagonalP6a=11.1110, c=10.62941,1361.79colourless Uniaxial (+) n=1.475, n=1.496
Max birefringence δ=0.021SturmanitetrigonalP3ca=11.16, c=21.79 Z=22,350yellow
Uniaxial (+/-) n=1.499-1.500, n=
Max birefringence δ=0.002514.13monoclinicP2/ca=9.0512, b=15.2776, c=15.0142 β=90.325° Z=42076.141.645BuryatitetrigonalP3ca=11.14, c=20.99 Z=42,2561.89Uniaxial (-) n=1.523(3), n=1.532(3) Max birefringence δ=0.009hexagonalP6/ma=6.502, c=19.02 Z=2 2.803FontarnauitemonoclinicP2/ca=6.458, b=22.299, c=8.571 β=103.05° Z=41,203triclinicPa=5.9679, b=6.8559, c=10.1698 α=79.608°, β=76.673°, γ=89.220° Z=2398.022.502hexagonalP6/ma = 6.5648, c = 19.5669 Z = 23.322331.83triclinicPa=6.2808, b=6.8321, c=8.6830 α=82.475°, β=76.758°, γ=87.300° Z=2359.513.065La2B3O4(OH)3(SO4)2orthorhombicPna21a=8.3986 b=6.9230 c=19.4065SHG 0.1×KDP351.84monoclinicP2/ma=6.2359, b=9.5542, c=6.8236 β=93.852° Z=2405.642.881355.17monoclinicP2/ma=6.2119, b=9.5328, c=6.7923 β=93.755° Z=2401.352.939343.27triclinicPa=6.1467, b=6.7280, c=8.6068 α=81.769°, β=76.653°, γ=87.259° Z=2342.713.326361.30monoclinicP2/ma=6.1601, b=9.5416, c=6.7589 β=93.816° Z=2396.393.027344.88triclinicPa=6.1205, b=6.7090, c=8.5844 α=81.713°, β=76.680°, γ=87.294° Z=2339.403.375362.89monoclinicP2/ma=6.1322, b=9.5139, c=6.7343 β=93.683° Z=2392.083.074368.19monoclinicP21/ma=6.1148, b=9.5078, c=6.7164 β=93.611° Z=2389.703.138369.87triclinicPa=6.0139, b=6.8972, c=10.1753 α=79.616°, β=76.590°, γ=89.106° Z=2403.423.045373.43triclinicPa=5.9880, b=6.8728, c=10.1638 α=79.652°, β=76.597°, γ=89.153° Z=2400.123.100375.86triclinicPa=5.9701, b=6.8570, c=10.1580 α=79.588°, β=76.636°, γ=89.193° Z=2397.753.138378.19triclinicPa=5.9529, b=6.8401, c=10.1553 α=79.598°, β=76.642°, γ=89.198° Z=2395.543.175379.86triclinicPa=5.9289, b=6.8232, c=10.1422 α=79.531°, β=76.663°, γ=89.263° Z=2392.403.215383.97triclinicPa=5.9150, b=6.8090, c=10.1454 α=79.541°, β=76.669°, γ=89.243° Z=2390.823.263385.91triclinicPa=5.8992, b=6.7954, c=10.1322 α=79.551°, β=76.691°, γ=89.266° Z=2388.533.299570.26monoclinicP2/ma=6.982, b=5.3917, c=8.167 β=98.643°303.96.231decompose ; band gap 1042.44monoclinicP2/ca=6.9363, b=15.8784, c=9.6053 β=110.770° Z=4989.157.000melt ; band gap orthorhombicPnmaa=12.9566, b=9.9289, c=7.8800 Z=41013.73.762monoclinicP12/c1a=6.4716, b=17.2900, c=9.1455 β=90.411° Z=41023.303.423
References