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Hydrochlorborite

A valid IMA mineral species - grandfathered
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About HydrochlorboriteHide

Formula:
Ca4B8O15Cl2 · 21H2O
Lustre:
Vitreous, Dull
Hardness:
Specific Gravity:
1.83 - 1.85
Crystal System:
Monoclinic
This page provides mineralogical data about Hydrochlorborite.


Unique IdentifiersHide

Mindat ID:
1970
Long-form identifier:
mindat:1:1:1970:1
GUID
(UUID V4):
206b9037-45be-4116-9420-04ff770218cc

Classification of HydrochlorboriteHide

Approved, 'Grandfathered' (first described prior to 1959)
6.DA.30

6 : BORATES
D : Tetraborates
A : Neso-tetraborates
26.3.4.1

26 : HYDRATED BORATES CONTAINING HYDROXYL OR HALOGEN
3 : Triborates
10.1.12

10 : Borates with other anions
1 : Borates with halide

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
HcbIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of HydrochlorboriteHide

Vitreous, Dull
Transparency:
Transparent
Hardness:
2½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
{001}, good.
Fracture:
Conchoidal
Density:
1.83 - 1.85 g/cm3 (Measured)    1.841 g/cm3 (Calculated)

Optical Data of HydrochlorboriteHide

Type:
Biaxial (+)
RI values:
nα = 1.499 - 1.501 nβ = 1.502 - 1.504 nγ = 1.520 - 1.521
2V:
Measured: 45° to 46°, Calculated: 44°
Max Birefringence:
δ = 0.021
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
r > v

Chemical Properties of HydrochlorboriteHide

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

Crystallography of HydrochlorboriteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 22.783(3) Å, b = 8.745(1) Å, c = 17.066(1) Å
β = 96.705(1)°
Ratio:
a:b:c = 2.605 : 1 : 1.952
Unit Cell V:
3,376.93 ų (Calculated from Unit Cell)
Z:
8
Morphology:
well-formed tabular crystals
Comment:
Space Group: I2/a

Crystallographic forms of HydrochlorboriteHide

Crystal Atlas:
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Hydrochlorborite - Tabular {001}
3d models and HTML5 code kindly provided by www.smorf.nl.

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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

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
8.48 Å(100)
6.01 Å(24)
3.604 Å(9)
2.798 Å(8)
2.825 Å(7)
2.186 Å(7)
8.18 Å(6)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Near-surface Processes
25 : Evaporites (prebiotic)

Type Occurrence of HydrochlorboriteHide

Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA, 131036
Geological Setting of Type Material:
Qinghai-Xizang Plateau, Tibet playa sediment
Associated Minerals at Type Locality:
Reference:
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).

Other Language Names for HydrochlorboriteHide

Related Minerals - Strunz-mindat 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 : P1
6.DA.25FedorovskiteCa2Mg2B4O7(OH)6Orth. mmm (2/m 2/m 2/m) : Pbam
6.DA.25RoweiteCa2Mn2+2B4O7(OH)6Orth. mmm (2/m 2/m 2/m) : Pbam
6.DA.35UralboriteCa2[B3O3(OH)5 · OB(OH)3]Mon. 2/m
6.DA.40BorcariteCa4Mg(B4O6(OH)6)(CO3)2Mon. 2/m : B2/m
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

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
Notes:
Soluble in H2O.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for HydrochlorboriteHide

References for HydrochlorboriteHide

Reference List:

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 references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Chile (TL)
 
  • Antofagasta
    • El Loa Province
      • Ollagüe
China (TL)
 
  • Qinghai
    • Haixi Mongol and Tibetan Autonomous Prefecture
Turkey
 
  • Eskişehir Province
    • Seyitgazi District
      • Kirka
 
矿物 and/or 产地  
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