Borate carbonate

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The borate carbonates are mixed anion compounds containing both borate and carbonate ions. Compared to mixed anion compounds containing halides, these are quite rare. They are hard to make, requiring higher temperatures, which are likely to decompose carbonate to carbon dioxide. The reason for the difficulty of formation is that when entering a crystal lattice, the anions have to be correctly located, and correctly oriented. [1] They are also known as carbonatoborates or borocarbonates. [2] Although these compounds have been termed carboborate, that word also refers to the C=B=C5− anion, or CB11H12 anion. [3] This last anion should be called 1-carba-closo-dodecaborate [4] or monocarba-closo-dodecaborate. [5]

Some borate carbonates have additional different anions and can be borate carbonate halides or borate carbonate nitrites.

List

chemmwcrystal systemspace groupunit cellvolumedensitycommentreferences
Qilianshanite NaHCO3 · H3BO3 · 2H2Omonoclinica = 16.11 Å, b = 6.92 Å, c = 6.73 Å

β = 100.46°

1.635Biaxial (-) nα = 1.351 nβ = 1.459 nγ = 1.486

2V: 50°

Max birefringence δ = 0.135

[6]
Canavesite Mg2(HBO3)(CO3) · 5H2Omonoclinica = 23.49(2) Å, b = 6.16(6) Å, c = 21.91(2) Å

β = 114.91(9)° Z=12?

1.790Biaxial (+) nα = 1.485 nβ = 1.494 nγ = 1.505

2V: 86°

Max birefringence: δ = 0.020

[7]
Potassium bis(carbonato)borate hydrateK[B(CO2-μ-O-CO2)2]·2H2OorthorhombicAba2a=11.058 b=11.169 c=9.0504 Z=41117.8spiro at boron [8]
NaK15[B4O5(OH)4]6(NO2)2(CO3)·7H2O2035.26hexagonalP62ca=11.1399 c=30.495 Z=23277.32.062 [9]
K9[B4O5(OH)4]3(CO3)OH7 H2O1128.82P62ca=11.207 c=17.193 Z=21870.22.005 [10]
K9[B4O5(OH)4]3(CO3)Cl·7H2O1147.29hexagonalP62ca=11.219 c=17.079 Z=21861.82.047 [11]
K9[B4O5(OH)4]3(CO3)Br·7H2O1191.75hexagonalP62ca=11.243 c=17.132 Z=21875.42.110 [11]
K9[B4O5(OH)4]3(CO3)I7 H2O1238.74P62ca=11.234 c=17.158 Z=21875.22.194 [10]
Ca4(Ca0.7Na0.3)3(Na0.70.3)Li5[B t12BΔ10O36(O,OH)6](CO3)(OH) · (OH,H2O)R3a=8.99 c=35.91 Z=325132.62 [12]
Chiyokoite Ca3Si(CO3){[B(OH)4]0.5(AsO3)0.5}(OH)6 · 12H2OhexagonalP63a = 11.0119, c = 10.52521,105.31 [13]
Carboborite Ca2Mg[B(OH)4]2(CO3)2 · 4H2Omonoclinica = 18.59 Å, b = 6.68 Å, c = 11.32 Å

β = 91.68°

Biaxial (-) nα = 1.507 nβ = 1.546 nγ = 1.569

Max Birefringence: δ = 0.062

[14]
Borcarite Ca4MgB4O5(OH)6(CO3)2monoclinicC2/ma=17.840 b=8.380 c=4.445 β =102.04649.9062.790Biaxial (-) nα = 1.590 nβ = 1.651 nγ = 1.657

2V: 30°

Max birefringence: δ = 0.067

[1] [15]
Sakhaite Ca3Mg(BO3)2(CO3)2.(H2O)0.36isometricFd3ma = 14.685 Z=43166.8 [1] [16]
Ca12Mg4(BO3)7(CO3)4(OH)Cl.H2OFd3 [1]
Harkerite Ca12Mg4Al(BO3)3(SiO4)4(CO3)5 · H2OtrigonalR3ma = 18.131 Å α = 33.46°1614Uniaxial nα = 1.649 - 1.653 nβ = 1.649 - 1.653 [17]
Imayoshiite Ca3Al(CO3)[B(OH)4](OH)6 · 12H2OhexagonalP63a = 11.026, c = 10.6051,1171.79Uniaxial (-) nω = 1.497(2) nε = 1.470(2)

Max birefringence δ = 0.027

[18]
Gaudefroyite Ca4Mn3O3(BO3)3CO3hexagonalP63/ma = 10.6 Å, c = 5.9 Å5743.529black

Uniaxial (+) nω = 1.805 - 1.810 nε = 2.015 - 2.020

Max Birefringence:δ = 0.210

[1] [19]
Numanoite Ca4Cu(B4O6(OH)6)(CO3)2monoclinicC2/ma = 17.794 Å, b = 8.381 Å, c = 4.4494 Å

β = 102.42° Z=2

bluish green

Biaxial (-) nα=1.618 nβ=1.658 nγ=1.672

2V: 60°

Max birefringence: δ = 0.054

[20]
Rb9[B4O5(OH)4]3(CO3)Cl7 H2O1564.59P62ca=11.325 c=17.181 Z=21908.32.502 [10]
Rb9[B4O5(OH)4]3(CO3)Br7 H2O1609.08P62ca=11.482 c=17.463 Z=21993.92.680 [10]
Rb9[B4O5(OH)4]3(CO3)I7 H2O1656.07P62ca=11.451 c=17.476 Z=21984.52.771 [10]
NaRb3B6O9(OH)3(HCO3)monoclinicP21a = 8.988 Å, b = 8.889 Å, c = 10.068 Å, and β = 114.6° [21]
Sr5(CO3)2(BO3)2orthorhombicPnmaa = 7.387 b = 16.556 c = 8.971 Z = 4UV cut off 190 nm [22]
Sr2CuO2(CO3)0.85(BO3)0.15I4 [1]
Sr(Na0.4Sr0.1)Na2[B5O8(OH)2] · (CO3)1 − xB2/b [23]
Moydite-(Y)Y[B(OH)4](CO3)orthorhombic [24]
K6[Cd2(CO3)2(B12O18)(OH)6]1099.19orthorhombicPnnma=13.0603 b=9.1059 c=12.3860 Z=21473.02.478colorless [25]
Rb6[Cd2(CO3)2(B12O18)(OH)6]1377.41orthorhombicPnnma=13.3484 b=9.2665 c=12.4946 Z=21545.52.960colorless [25]
Ba2(BO3)1-x(CO3)xClx x=0.1P3m1 [1]
Ba3[B6O10(OH)2](CO3)730.905monoclinica=6.5351, b=8.3455, c =11.3489, and β = 98.9568° Z=2611.43.970 [26]
Ba5(CO3)2(BO3)2924.34orthorhombicPnmaa=7.923 b=17.508 c=9.114 Z=41268.44.84 [1]
Ba4Sr(CO3)2(BO3)2874.63orthorhombicPnmaa=7.731 b=17.349 c=9.048 Z=41213.67.787 [1]
Ba6[B12O21(OH)2](CO3)21443.80monoclinica =6.5485, b = 19.361, c = 18.120, and β = 90.893° Z=42297.04.175 [26]
Li9BaB15O27(CO3)P31ca=8.860, c=15.148 [1] [27]
Ba3(BO3)(CO3)F549.84trigonalR3a=10.1799 c=18.530 Z=91663.04.941 [28]
Pb7O(OH)3(CO3)3(BO3)1756.19hexagonalP63/mca=10.519 c=8.90 Z=28536.839SHG 4.5×KDP [29]
Mereheadite Pb47O24(OH)13Cl25(BO3)2(CO3)monoclinicCma = 17.372, b = 27.942, c = 10.6661, β = 93.152o5169.6 [30]
Britvinite [Pb7(OH)3F(BO3)2(CO3)][Mg4.5(OH)3(Si5O14)]triclinicP1a = 9.3409, b = 9.3579, c = 18.833

α = 80.365°, β = 75.816°, γ = 59.870° Z=2

1378.75.51Biaxial (-) nα = 1.896 nβ = 1.903 nγ = 1.903

2V 20°

Max birefringence δ = 0.007

[31]
RoymilleritePb24Mg9(Si10O28)(CO3)10(BO3)(SiO4)(OH)13O5triclinicP1a = 9.316, b = 9.316, c = 26.463

α = 83.295°, β = 83.308°, γ = 60.023° Z=1

1971.25.973Biaxial (-) nα = 1.860 nβ = 1.940 nγ = 1.940

2V 5°

Max birefringence δ = 0.080

[32]

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