Hydrochlorborite
A valid IMA mineral species - grandfathered
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About Hydrochlorborite
Formula:
Ca4B8O15Cl2 · 21H2O
Lustre:
Vitreous, Dull
Hardness:
2½
Specific Gravity:
1.83 - 1.85
Crystal System:
Monoclinic
Co-Type Localities:
This page provides mineralogical data about Hydrochlorborite.
Unique Identifiers
Mindat ID:
1970
Long-form identifier:
mindat:1:1:1970:1
GUID
(UUID V4):
(UUID V4):
206b9037-45be-4116-9420-04ff770218cc
Classification of Hydrochlorborite
Approved, 'Grandfathered' (first described prior to 1959)
Type description reference:
6.DA.30
6 : BORATES
D : Tetraborates
A : Neso-tetraborates
6 : BORATES
D : Tetraborates
A : Neso-tetraborates
26.3.4.1
26 : HYDRATED BORATES CONTAINING HYDROXYL OR HALOGEN
3 : Triborates
26 : HYDRATED BORATES CONTAINING HYDROXYL OR HALOGEN
3 : Triborates
10.1.12
10 : Borates with other anions
1 : Borates with halide
10 : Borates with other anions
1 : Borates with halide
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Hcb | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Hydrochlorborite
Vitreous, Dull
Transparency:
Transparent
Hardness:
2½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
{001}, good.
{001}, good.
Fracture:
Conchoidal
Density:
1.83 - 1.85 g/cm3 (Measured) 1.841 g/cm3 (Calculated)
Optical Data of Hydrochlorborite
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.
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
r > v
Chemical Properties of Hydrochlorborite
Formula:
Ca4B8O15Cl2 · 21H2O
IMA Formula:
Ca2B3O3(OH)4 · BO(OH)3Cl · 7H2O
Crystallography of Hydrochlorborite
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)°
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 Hydrochlorborite
Crystal Atlas:
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0000683 | Hydrochlorborite | Brown 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 63 814-823 | 1978 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
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 Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Near-surface Processes | |
25 : Evaporites (prebiotic) |
Type Occurrence of Hydrochlorborite
Co-Type Localities:
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 Hydrochlorborite
German:Hydrochlorborit
Russian:Гидрохлорборит
Simplified Chinese: 多水氯硼钙石
Spanish:Hydrochlorborita
Traditional Chinese:多水氯硼鈣石
Related Minerals - Strunz-mindat Grouping
6.DA.10 | Borax | Na2(B4O5)(OH)4 · 8H2O | Mon. 2/m : B2/b |
6.DA.15 | Tincalconite | Na2(B4O7) · 5H2O | Trig. 3 2 : R3 2 |
6.DA.20 | Hungchaoite | Mg(B4O7) · 9H2O | Tric. 1 : P1 |
6.DA.25 | Fedorovskite | Ca2Mg2B4O7(OH)6 | Orth. mmm (2/m 2/m 2/m) : Pbam |
6.DA.25 | Roweite | Ca2Mn2+2B4O7(OH)6 | Orth. mmm (2/m 2/m 2/m) : Pbam |
6.DA.35 | Uralborite | Ca2[B3O3(OH)5 · OB(OH)3] | Mon. 2/m |
6.DA.40 | Borcarite | Ca4Mg(B4O6(OH)6)(CO3)2 | Mon. 2/m : B2/m |
6.DA.40 | Numanoite | Ca4Cu(B4O6(OH)6)(CO3)2 | Mon. 2/m : B2/m |
6.DA.60 | Fontarnauite | (Na,K)2(Sr,Ca) (SO4)[B5O8(OH)] · 2H2O | Mon. 2/m : P21/b |
Other Information
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 Hydrochlorborite
mindat.org URL:
https://www.mindat.org/min-1970.html
Please feel free to link to this page.
Please feel free to link to this page.
External Links:
Mineral Dealers:
References for Hydrochlorborite
Reference List:
Localities for Hydrochlorborite
Locality List
- 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.
All localities listed without proper references should be considered as questionable.
Chile (TL) | |
| |
China (TL) | |
| |
Turkey | |
|
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Salar de Carcote, Ollagüe, El Loa Province, Antofagasta, Chile