Borate chloride

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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) Volume3) Density (g/cm3)CommentReferences
Teepleite Na2[B(OH)4]Cl tetragonal P4/nmma = 7.25, c = 4.84254.42.076Colourless, 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 Pca21a = 8.577, b = 8.553, c = 12.09 Z=4992.52.95Green, 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)5orthorhombica = 17.92, b = 17.6, c = 3.19782.80White 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 2.32Colourless 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 R3ma = 15.1431, c = 14.456 Z=32.1White 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)4ClTetragonala = 9.85, c = 13.061,2672.5Colorless 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 P1a=6.463 b=6.564 c=6.302 α = 61°38', β = 118°46', γ = 105°47' Z=1205.82.67 to 2.71Colorless, light pink crystals with a vitreous lustre. [8]
Solongoite Ca2(H3B3O7)(OH)Clmonoclinica = 7.93, b = 7.26, c = 12.54 β = 94°7202.514Colourless 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 = 23.882,9092.440White 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 = 3:1orthorhombica = 13.69, b = 20.84, c = 8.262,3572.21Colorless crystals.

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

[11]
Sakhaite Ca48Mg16(BO3)32(CO3)16·2(H2O,HCl)isometricFd3ma = 14.685 Z=43166.82.78 - 2.83Colourless, gray to grayish white crystals with a greasy lustre. [12]
Hydrochlorborite Ca4B8O15Cl2·21H2Omonoclinica = 22.78, b = 8.74, c = 17.06 β = 96.7°33731.83 - 1.85Colorless 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/ca = 10.19, b = 7.76, c = 18.81

β = 93.33° Z=4

1,4852.753Colorless 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·4H2OtriclinicP1a = 6.57, b = 23.92, c = 6.52

α = 90.58°, β = 119.1°, γ = 95.56°

889.22.27Colourless 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·H2OtriclinicP1a = 6.5732, b = 6.4445, c = 6.3693, α = 60.995°, β = 61.257°, γ = 77.191° Z=12.99Colourless to white crystals with a vitreous lustre. [16]
Chambersite (Mn2+)3(B7O13)ClorthorhombicPca21a = 8.68, b = 8.68, c = 12.26 Z=49243.49Colorless 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)Clorthorhombica = 8.58, b = 8.65, c = 12.179033.17 - 3.27Red, 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]CltrigonalR3ca = 8.62, c = 21.0513553.58Pale red or pink crystals.

Uniaxial (-) nω = 1.755 nε = 1.731

Max birefringence δ = 0.024

[19]
Trembathite (Mg,Fe2+)3[B7O13]Cltrigonala = 8.57, c = 20.9913352.84 - 3.34Colourless 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]CltetragonalP4/nmma = 6.19 Å, c = 5.61 Z=2214.92.81Deep 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]
Li3B8O13Cl350.75OtrhorhombicPca21a=17.229 b=9.3827 c=6.6452 Z=41074.252.169birefringence 0.094 at 1064 nm [23]
Na4[B6O9(OH)3](H2O)ClOtrhorhombicPca21a=15.4867 b=8.6867 c=8.8551 Z=21191.32.260SHG 0.4 × KDP [24]
Mg3B7O13Cl[ clarification needed ]392.05orthorhombicPca21a=8.5319 b=8.5282 c=12.0730 Z=4878.452.964NLO [25]
KZn2BO3Cl2trigonalR32NLO SHG 1.3 × KDP [26]
Ag4B7O12Cl734.6triclinicP1a=8.7394 b=8.7881 c=9.1381 α=65.625° β=77.269° γ=61.173° Z=2562 [27]
RbZn2BO3Cl2345.92trigonalR32a=4.965 c=27.21NLO SHG 1.17 × KDP [26]
Sn3B10O17Cl2orthorhombicPbcna =19.1905 b=10.3893 c=8.5164UV cutoff 280 nm; birefringence 0.125 at 546 nm [28]
Ba6BO3Cl91201.90monoclinicP21/na=8.229 b=12.259 c=19.080 β=90.20 Z=41924.74.418colourless [29]
NaBa4Al2B8O18Cl3tetragonalP42nma = 12.048, c = 6.817NLO [30]
NaBa4(GaB4O9)2Cl31192.62tetragonalP42nma=12.1033 c=6.8329 Z=21001.03.957SHG 1.5xKDP [31]
Rb4Ba2.5B20O34Cl1481.10triclinicP1a=6.756 b=11.086 c=11.288 α=99.07° β=90.60° γ=100.38° Z=1820.62.9965colourless [32]
La(BO2)2Cltriclinic [33]
Cs2La2B10O17Cl41065.54monoclinicCma=8.6904 b=20.92 c=6.4231 β =104.003 Z=21126.153.142SHG 2.1xKDP [34]
Ce(BO2)2CltriclinicP1a = 4.2174; b = 6.5763; c = 8.1221 α = 82, 152; β = 89, 206; γ = 72.048°; Z = 2 [33]
Ce3[BO3]2Cl3hexagonalP63/ma = 9.2008, c = 5.8079; Z = 2 [33]
Pr(BO2)2Cltriclinic [33]
Sm4[B16O26(OH)4(H2O)3Cl4] [35]
Eu4[B16O26(OH)4(H2O)3Cl4] [35]
Gd4[B16O26(OH)4(H2O)3Cl4] [35]
Pb6BO4Cl71566triclinicP1a=8.001 b=8.054 c=13.116 α=89.52 β=89.66 γ=69.942793.96.551colourless [29]
Pu[B4O6(OH)2Cl]monoclinicCca=6.4898 b=11.174 c=9.6183 β=105.15° [36]
Pu2[B13O19(OH)5Cl2(H2O)3]monoclinicP21/na=8.0522 b=14.568 c=9.82 β=90.12° [36]
Pu4[B16O26(OH)4(H2O)3Cl4] [35]
Am[B9O13(OH)4]·H2OmonoclinicP21/na=7.703Å b=16.688Å c=9.872 β=90.073° [36]
Am4[B16O26(OH)4(H2O)3Cl4] [35]
Cm2[B14O20(OH)7(H2O)2Cl]monoclinicP21/na=7.9561 b=14.212 c=9.836 β=90.013° [36]
Cm4[B16O26(OH)4(H2O)3Cl4] [35]
Cf4[B16O26(OH)4(H2O)3Cl4] [35]

Related Research Articles

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The borate fluorides or fluoroborates are compounds containing borate or complex borate ions along with fluoride ions that form salts with cations such as metals. They are in the broader category of mixed anion compounds. They are not to be confused with tetrafluoroborates (BF4) or the fluorooxoborates which have fluorine bonded to boron.

The fluoride phosphates or phosphate fluorides are inorganic double salts that contain both fluoride and phosphate anions. In mineralogy, Hey's Chemical Index of Minerals groups these as 22.1. The Nickel-Strunz grouping is 8.BN.

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. They are also known as carbonatoborates or borocarbonates. Although these compounds have been termed carboborate, that word also refers to the C=B=C5− anion, or CB11H12 anion. This last anion should be called 1-carba-closo-dodecaborate or monocarba-closo-dodecaborate.

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