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About HydrochlorboriteHide

Ca4B8O15Cl2 · 21H2O
Crystal System:
This page provides mineralogical data about Hydrochlorborite.

Classification of HydrochlorboriteHide

Approved, 'Grandfathered' (first described prior to 1959)

D : Tetraborates
A : Neso-tetraborates

3 : Triborates

10 : Borates with other anions
1 : Borates with halide

Physical Properties of HydrochlorboriteHide

2½ on Mohs scale

Optical Data of HydrochlorboriteHide

Biaxial (+)
RI values:
nα = 1.499 nβ = 1.502 nγ = 1.521
Measured: 45° , Calculated: 44°
Max Birefringence:
δ = 0.022
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
r > v

Chemical Properties of HydrochlorboriteHide

Ca4B8O15Cl2 · 21H2O
IMA Formula:
Ca2B3O3(OH)4 · BO(OH)3Cl · 7H2O

Crystallography of HydrochlorboriteHide

Crystal System:
Cell Parameters:
a = 22.78 Å, b = 8.74 Å, c = 17.06 Å
β = 96.7°
a:b:c = 2.606 : 1 : 1.952
Unit Cell V:
3,373.40 ų (Calculated from Unit Cell)

Crystallographic forms of HydrochlorboriteHide

Crystal Atlas:
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Hydrochlorborite - Tabular {001}
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Edge Lines | Miller Indices | Axes

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Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0000683HydrochlorboriteBrown G E, Clark J R (1978) Crystal structure of hydrochlorborite, Ca2[B3O3(OH)4.OB(OH)3]Cl.7H2O, a seasonal evaporite mineral American Mineralogist 63 814-82319780293
CIF Raw Data - click here to close

Type Occurrence of HydrochlorboriteHide

Other Language Names for HydrochlorboriteHide

Related Minerals - Nickel-Strunz GroupingHide

6.DA.10BoraxNa2(B4O5)(OH)4 · 8H2OMon. 2/m : B2/b
6.DA.15TincalconiteNa2(B4O7) · 5H2OTrig. 3 2 : R3 2
6.DA.20HungchaoiteMg(B4O7) · 9H2OTric. 1
6.DA.25FedorovskiteCa2Mg2B4O7(OH)6Orth. mmm (2/m 2/m 2/m) : Pbam
6.DA.35UralboriteCa2[B3O3(OH)5 · OB(OH)3]Mon.
6.DA.40NumanoiteCa4Cu(B4O6(OH)6)(CO3)2Mon. 2/m : B2/m
6.DA.60Fontarnauite(Na,K)2(Sr,Ca) (SO4)[B5O8(OH)]·2H2OMon. 2/m : P21/b

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

10.1.1TeepleiteNa2[B(OH)4]ClTet. 4/mmm (4/m 2/m 2/m) : P4/nmm
10.1.2BandyliteCu[B(OH)4]ClTet. 4/mmm (4/m 2/m 2/m) : P4/nmm
10.1.3BerboriteBe2(BO3)(OH,F) · H2OTrig.
10.1.5BoraciteMg3(B7O13)ClOrth. mm2 : Pca21
10.1.7ShabyniteMg5(BO3)(OH)5(Cl,OH)2 · 4H2OMon.
10.1.8/9/10HilgarditeCa2B5O9Cl · H2OTric. 1 : P1
10.1.13EkateriniteCa2(B4O7)(Cl,OH)2 · 2H2OHex.
10.1.14VolkovskiteKCa4[B5O8OH]4[B(OH)3]2Cl · 4H2OTric. 1 : P1
10.1.15ChelkariteCaMgB2O4(Cl,OH)2 · 5H2O Or near, with Cl:OH = 3:1Orth.
10.1.16JohachidoliteCaAlB3O7Orth. mmm (2/m 2/m 2/m) : Cmma
10.1.17SatimoliteKNa2(Al5Mg2)[B12O18(OH)12](OH)6Cl4·4H2OTrig. 3m (3 2/m) : R3m
10.1.18ChambersiteMn2+3(B7O13)ClOrth. mm2 : Pca21
10.1.19Congolite(Fe2+,Mg)3(B7O13)ClTrig. 3m : R3c

Other InformationHide

IR Spectrum:
Salar de Carcote material (Chukanov, 2014), [cm-1]: 3525s, 3455s, 3260sh, 3070sh, 1667w, 1619, 1570, 1544, 1465sh, 1424, 1378s, 1365sh, 1240, 1170sh, 1124, 1078, 1009s, 967, 925, 904s, 822w, 764w, 703w, 644w, 603, 567, 510, 460
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for HydrochlorboriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Chien Tzu-Chiang and Chen Su-Chien (1965): Brief note on preliminary results of a study of a new borate mineral - Hydrochlorborite: Ca4B8O15Cl2 * 22H2O. Scientia Sinica 14, 945-946 (in Russian).
Qian Ziqiang, Chen Shuzhen, Ma Shinian, and Liu Xunjian (1965): Hydrochlorborite, a new hydrous chlor-borate mineral. Acta Geologica Sinica 45(2), 209-216 (in Chinese with English abstract). - American Mineralogist 50, 2099 (abstract).
American Mineralogist 62, 147-150.
Brown & Clark (1978), Crystal structure of hydrochlorborite, A seasonal evaporite mineral: American Mineralogist 63, 814-823.
Chukanov, N.V. (2014): Infrared spectra of mineral species: Extended library. Springer (Springer Geochemistry/Mineralogy), vol. 1, Dordrecht, 1726 pp.

Internet Links for HydrochlorboriteHide

Localities for HydrochlorboriteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Chile (TL)
  • Antofagasta
    • El Loa Province
      • Ollagüe
AmMin. 62:147-150 (1977)
China (TL)
Chien Tzu-Chiang and Chen Su-Chien (1965): Scientia Sinica 14, 945-946.
  • Qinghai
    • Haixi Mongol and Tibetan Autonomous Prefecture
Shaoxiu Yang (1991): Journal of Lake Sciences 3(1), 1-10; Qishun Fan, Haizhou Ma, Hongbing Tan, Tingwei Li, and Jianxin Xu (2007): Acta Geoscientica Sinica 28(5), 446-455
  • Eskişehir Province
    • Seyitgazi District
      • Kirka
Koçak, İ. & Koç, Ş. (2016): Geochemical characteristics of Kırka (Sarıkaya) borate deposit, northwestern Anatolia, Turkey. Journal of Earth System Science: 125: 147-164; (2016)
矿物 and/or 产地  
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