Borate chloride

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	Fd3m	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]
	KZn2BO3Cl2		trigonal	R32				NLO SHG 1.3 × KDP	[26]
	Ag4B7O12Cl	734.6	triclinic	P1	a=8.7394 b=8.7881 c=9.1381 α=65.625° β=77.269° γ=61.173° Z=2	562			[27]
	RbZn2BO3Cl2	345.92	trigonal	R32	a=4.965 c=27.21			NLO SHG 1.17 × KDP	[26]
	Sn3B3O7Cl		orthorhombic	Pna21	a=9.5239 b=7.5804 c=12.3065 Z=4	1825	4.007	SHG 0.5 × of KDP
	Sn3B10O17Cl2		orthorhombic	Pbcn	a =19.1905 b=10.3893 c=8.5164			UV cutoff 280 nm; birefringence 0.125 at 546 nm	[28]
	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	[29]
	NaBa4Al2B8O18Cl3		tetragonal	P42nm	a = 12.048, c = 6.817			NLO	[30]
	NaBa4(GaB4O9)2Cl3	1192.62	tetragonal	P42nm	a=12.1033 c=6.8329 Z=2	1001.0	3.957	SHG 1.5xKDP	[31]
	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	[32]
	La(BO2)2Cl		triclinic						[33]
	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	[34]
	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				[33]
	Ce3[BO3]2Cl3		hexagonal	P63/m	a = 9.2008, c = 5.8079; Z = 2				[33]
	Pr(BO2)2Cl		triclinic						[33]
	Sm4[B16O26(OH)4(H2O)3Cl4]								[35]
	Eu4[B16O26(OH)4(H2O)3Cl4]								[35]
	Gd4[B16O26(OH)4(H2O)3Cl4]								[35]
	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	[29]
	Pu[B4O6(OH)2Cl]		monoclinic	Cc	a=6.4898 b=11.174 c=9.6183 β=105.15°				[36]
	Pu2[B13O19(OH)5Cl2(H2O)3]		monoclinic	P21/n	a=8.0522 b=14.568 c=9.82 β=90.12°				[36]
	Pu4[B16O26(OH)4(H2O)3Cl4]								[35]
	Am[B9O13(OH)4]·H2O		monoclinic	P21/n	a=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]		monoclinic	P21/n	a=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]