The borate chlorides are chemical compounds that contain both borate ions and chloride ions. They are mixed anion compounds. Many of them are minerals. Those minerals that crystallise with water (hydrates) may be found in evaporite deposits formed when mineral water has dried out.

List

Chemical formula Molar mass (g/mol) Crystal system Space group Unit cell (Å) Volume (Å3) Density (g/cm3) Comment References
Teepleite Na2[B(OH)4]Cl tetragonal P4/nmm a = 7.25, c = 4.84 254.4 2.076 Colourless, white or light beige crystals, with a vitreous, greasy, or dull lustre.

Uniaxial (-) nω = 1.519 nε = 1.503

Max birefringence δ = 0.016

[1]
Boracite Mg3(B7O13)Cl orthorhombic Pca21 a = 8.577, b = 8.553, c = 12.09 Z=4 992.5 2.95 Green, dark green (ferroan), blue, colourless, grey or white crystals with an adamantine, vitreous lustre if transparent.

Biaxial (+) nα = 1.658 - 1.662 nβ = 1.662 - 1.667 nγ = 1.668 - 1.673 2V 82°

Max birefringence δ = 0.010 - 0.011

[2]
Karlite Mg7(BO3)3(OH,Cl)5 orthorhombic a = 17.92, b = 17.6, c = 3.1 978 2.80 White to light green crystals with a silky lustre.

Biaxial (-) nα = 1.589 nβ = 1.632 nγ = 1.634

2V 24°

Max birefringence δ = 0.045

[3]
Shabynite Mg5(BO3)(OH)5(Cl,OH)2·4H2O monoclinic 2.32 Colourless or white crystals with a silky lustre.

Biaxial (-) nα = 1.543 nβ = 1.571 nγ = 1.577

2V 49°

Max birefringence δ = 0.034

[4]
Satimolite KNa2Mg2Al5[B12O18(OH)12](OH)6Cl4·4H2O trigonal R3m a = 15.1431, c = 14.456 Z=3 2.1 White to colorless crystals with a vitreous or dull lustre.

Biaxial (-) nα = 1.535 nβ = 1.552 nγ = 1.553 2V 26°

Max birefringence δ = 0.018

[5][6]
Kalborsite K6Al4BSi6O20(OH)4Cl Tetragonal a = 9.85, c = 13.06 1,267 2.5 Colorless with a slight rose-brownish tint crystals with a vitreous or pearly lustre.

Uniaxial (+) nω = 1.525 nε = 1.525 ? Max birefringence δ = 0.000

[7]
Hilgardite Ca2B5O9Cl·H2O triclinic P1 a=6.463 b=6.564 c=6.302 α = 61°38', β = 118°46', γ = 105°47' Z=1 205.8 2.67 to 2.71 Colorless, light pink crystals with a vitreous lustre. [8]
Solongoite Ca2(H3B3O7)(OH)Cl monoclinic a = 7.93, b = 7.26, c = 12.54 β = 94° 720 2.514 Colourless crystals with a vitreous lustre.

Biaxial (+) nα = 1.510 nβ = 1.510 nγ = 1.545

Max birefringence δ = 0.035

[9]
Ekaterinite Ca2(B4O7)(Cl,OH)2·2H2O hexagonal a = 11.86, c = 23.88 2,909 2.440 White or white with slight rose tint crystals with a pearly lustre.

Uniaxial (-) nω = 1.577 nε = 1.574 Max birefringence δ = 0.003

[10]
Chelkarite CaMgB2O4(Cl,OH)2·5H2O or near Cl:OH = 3:1 orthorhombic a = 13.69, b = 20.84, c = 8.26 2,357 2.21 Colorless crystals.

Biaxial (+) nα = 1.520 nγ = 1.558 Max birefringence δ = 0.038

[11]
Sakhaite Ca48Mg16(BO3)32(CO3)16·2(H2O,HCl) isometric Fd3_m a = 14.685 Z=4 3166.8 2.78 - 2.83 Colourless, gray to grayish white crystals with a greasy lustre. [12]
Hydrochlorborite Ca4B8O15Cl2·21H2O monoclinic a = 22.78, b = 8.74, c = 17.06 β = 96.7° 3373 1.83 - 1.85 Colorless crystals with a vitreous, dull lustre.

Biaxial (+) nα = 1.499 nβ = 1.502 nγ = 1.521 2V 45°

Max birefringence δ = 0.022

[13]
Heidornite Na2Ca3B5O8(OH)2(SO4)2Cl monoclinic C2/c a = 10.19, b = 7.76, c = 18.81

β = 93.33° Z=4

1,485 2.753 Colorless crystals with a vitreous lustre.

Biaxial (+) nα = 1.579 nβ = 1.588 nγ = 1.604 2V 63° to 77°

Max birefringence δ = 0.025

[14]
Volkovskite KCa4[B5O8OH]4[B(OH)3]2Cl·4H2O triclinic P1 a = 6.57, b = 23.92, c = 6.52

α = 90.58°, β = 119.1°, γ = 95.56°

889.2 2.27 Colourless or pink; varying from pale to deep orange crystals with a vitreous lustre.

Biaxial (+) nα = 1.523 - 1.539 nβ = 1.539 - 1.540 nγ = 1.596 - 1.605 2V 14.6°

Max birefringence δ = 0.073

[15]
Kurgantaite CaSr[B5O9]Cl·H2O triclinic P1 a = 6.5732, b = 6.4445, c = 6.3693, α = 60.995°, β = 61.257°, γ = 77.191° Z=1 2.99 Colourless to white crystals with a vitreous lustre. [16]
Chambersite (Mn2+)3(B7O13)Cl orthorhombic Pca21 a = 8.68, b = 8.68, c = 12.26 Z=4 924 3.49 Colorless to deep purple crystals with a vitreous lustre.

Biaxial (+) nα = 1.732 nβ = 1.737 nγ = 1.744

2V 83°

Max birefringence δ = 0.012

[17]
Ericaite (Fe2+)3(B7O13)Cl orthorhombic a = 8.58, b = 8.65, c = 12.17 903 3.17 - 3.27 Red, green, purple, brown or black crystals.

Biaxial (-) nα = 1.731 nβ = 1.755 nγ = 1.755 Max birefringence δ = 0.024

[18]
Congolite (Fe2+,Mg)3[B7O13]Cl trigonal R3c a = 8.62, c = 21.05 1355 3.58 Pale red or pink crystals.

Uniaxial (-) nω = 1.755 nε = 1.731

Max birefringence δ = 0.024

[19]
Trembathite (Mg,Fe2+)3[B7O13]Cl trigonal a = 8.57, c = 20.99 1335 2.84 - 3.34 Colourless to pale blue transparent crystals with a vitreous lustre.

Uniaxial (-) nω = 1.684 nε = 1.668

Max birefringence δ = 0.016

[20][21]
Bandylite Cu2+[B(OH)4]Cl tetragonal P4/nmm a = 6.19 Å, c = 5.61 Z=2 214.9 2.81 Deep blue crystals with greenish portions; cendre blue to Italian blue, becoming greener with atacamite inclusions, with a vitreous or pearly lustre.

Uniaxial (-) nω = 1.691 - 1.692 nε = 1.640 - 1.641

Max birefringence δ = 0.051

[22]
Li3B8O13Cl 350.75 Otrhorhombic Pca21 a=17.229 b=9.3827 c=6.6452 Z=4 1074.25 2.169 birefringence 0.094 at 1064 nm [23]
Na4[B6O9(OH)3](H2O)Cl Otrhorhombic Pca21 a=15.4867 b=8.6867 c=8.8551 Z=2 1191.3 2.260 SHG 0.4 × KDP [24]
Mg3B7O13Cl[clarification needed] 392.05 orthorhombic Pca21 a=8.5319 b=8.5282 c=12.0730 Z=4 878.45 2.964 NLO [25]
Sn3B10O17Cl2 orthorhombic Pbcn a =19.1905 b=10.3893 c=8.5164 UV cutoff 280 nm; birefringence 0.125 at 546 nm [26]
Ba6BO3Cl9 1201.90 monoclinic P21/n a=8.229 b=12.259 c=19.080 β=90.20 Z=4 1924.7 4.418 colourless [27]
NaBa4Al2B8O18Cl3 tetragonal P42nm a = 12.048, c = 6.817 NLO [28]
NaBa4(GaB4O9)2Cl3 1192.62 tetragonal P42nm a=12.1033 c=6.8329 Z=2 1001.0 3.957 SHG 1.5xKDP [29]
Rb4Ba2.5B20O34Cl 1481.10 triclinic P1 a=6.756 b=11.086 c=11.288 α=99.07° β=90.60° γ=100.38° Z=1 820.6 2.9965 colourless [30]
La(BO2)2Cl triclinic [31]
Cs2La2B10O17Cl4 1065.54 monoclinic Cm a=8.6904 b=20.92 c=6.4231 β =104.003 Z=2 1126.15 3.142 SHG 2.1xKDP [32]
Ce(BO2)2Cl triclinic P1 a = 4.2174; b = 6.5763; c = 8.1221 α = 82, 152; β = 89, 206; γ = 72.048°; Z = 2 [31]
Ce3[BO3]2Cl3 hexagonal P63/m a = 9.2008, c = 5.8079; Z = 2 [31]
Pr(BO2)2Cl triclinic [31]
Sm4[B16O26(OH)4(H2O)3Cl4] [33]
Eu4[B16O26(OH)4(H2O)3Cl4] [33]
Gd4[B16O26(OH)4(H2O)3Cl4] [33]
Pb6BO4Cl7 1566 triclinic P1_ a=8.001 b=8.054 c=13.116 α=89.52 β=89.66 γ=69.942 793.9 6.551 colourless [27]
Pu4[B16O26(OH)4(H2O)3Cl4] [34]
Am4[B16O26(OH)4(H2O)3Cl4] [34]
Cm4[B16O26(OH)4(H2O)3Cl4] [34]
Cf4[B16O26(OH)4(H2O)3Cl4] [34]

References

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  2. ^ "Boracite". www.mindat.org. Retrieved 2020-12-14.
  3. ^ "Karlite". www.mindat.org. Retrieved 2020-12-14.
  4. ^ "Shabynite". www.mindat.org. Retrieved 2020-12-14.
  5. ^ "Satimolite". www.mindat.org. Retrieved 2020-12-14.
  6. ^ "Satimolite Mineral Data".
  7. ^ "Kalborsite". www.mindat.org. Retrieved 2020-12-15.
  8. ^ Rumanova, I. M.; Iorysh, Z. I.; Belov, N. V. (1977). "Crystal structure of triclinic hilgardite Ca2[B5O9]Cl⋅H2O=Ca2[Bt3BΔ2O9]Cl⋅H2O". Dokl. Akad. Nauk SSSR. 23 (1): 91–94. Retrieved 2020-12-10 – via www.mathnet.ru.
  9. ^ "Solongoite". www.mindat.org. Retrieved 2020-12-14.
  10. ^ "Ekaterinite". www.mindat.org. Retrieved 2020-12-14.
  11. ^ "Chelkarite". www.mindat.org. Retrieved 2020-12-14.
  12. ^ "Sakhaite". www.mindat.org. Retrieved 2020-12-14.
  13. ^ "Hydrochlorborite". www.mindat.org. Retrieved 2020-12-14.
  14. ^ "Heidornite". www.mindat.org. Retrieved 2020-12-15.
  15. ^ "Volkovskite". www.mindat.org. Retrieved 2020-12-14.
  16. ^ "Kurgantaite". www.mindat.org. Retrieved 2023-03-23.
  17. ^ "Chambersite". www.mindat.org. Retrieved 2020-12-14.
  18. ^ "Ericaite". www.mindat.org. Retrieved 2020-12-14.
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  20. ^ "Trembathite". www.mindat.org. Retrieved 2020-12-14.
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