Uralborite
A valid IMA mineral species
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About Uralborite
Formula:
Ca2[B3O3(OH)5 · OB(OH)3]
Colour:
Colourless
Lustre:
Vitreous
Hardness:
4 - 4½
Specific Gravity:
2.58 - 2.60
Crystal System:
Monoclinic
Name:
The name reflects its discovery locality and composition: a borate.
This page provides mineralogical data about Uralborite.
Unique Identifiers
Mindat ID:
4097
Long-form identifier:
mindat:1:1:4097:2
GUID
(UUID V4):
(UUID V4):
f1e8e23c-f07c-45f9-8bd5-9fbbfd91f120
IMA Classification of Uralborite
Approved
IMA Formula:
CaB2O2(OH)4
First published:
1961
Classification of Uralborite
6.DA.35
6 : BORATES
D : Tetraborates
A : Neso-tetraborates
6 : BORATES
D : Tetraborates
A : Neso-tetraborates
25.3.4.1
25 : ANHYDROUS BORATES CONTAINING HYDROXYL OR HALOGEN
3 : Triborates
25 : ANHYDROUS BORATES CONTAINING HYDROXYL OR HALOGEN
3 : Triborates
9.3.4
9 : Borates
3 : Borates of Ca and Sr
9 : Borates
3 : Borates of Ca and Sr
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 |
---|---|---|
Ubo | 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 Uralborite
Vitreous
Transparency:
Transparent
Colour:
Colourless
Hardness:
4 - 4½ on Mohs scale
Cleavage:
Distinct/Good
One, parallel to elongation, distinct.
One, parallel to elongation, distinct.
Density:
2.58 - 2.60 g/cm3 (Measured) 2.58 g/cm3 (Calculated)
Optical Data of Uralborite
Type:
Biaxial (+)
RI values:
nα = 1.604 - 1.000 nβ = 1.609 - 1.611 nγ = 1.615 - 1.618
2V:
Measured: 85° , Calculated: 86°
Max Birefringence:
δ = 0.011 - 0.618
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:
Moderate
Dispersion:
r > v
Comments:
anomalous dark blue and brown interference colors may be observed
Chemistry of Uralborite
Mindat Formula:
Ca2[B3O3(OH)5 · OB(OH)3]
Elements listed:
Crystallography of Uralborite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 6.925(2) Å, b = 12.328(3) Å, c = 9.833(3) Å
β = 97.50(40)°
β = 97.50(40)°
Ratio:
a:b:c = 0.562 : 1 : 0.798
Unit Cell V:
832.28 ų (Calculated from Unit Cell)
Z:
4
Comment:
Space Group: P21/n.
Crystal Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
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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) |
---|---|---|---|---|---|---|---|
0012456 | Uralborite | Simonov M A, Egorov-Tismenko Y K, Belov N V (1977) Accurate crystal structure of uralborite, Ca2[B4O4(OH)8] Doklady Akademii Nauk SSSR 234 822-825 | 1977 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
7.61 Å | (10) |
2.13 Å | (10) |
2.97 Å | (9) |
1.407 Å | (8) |
6.18 Å | (6) |
3.42 Å | (6) |
4.81 Å | (5) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Near-surface Processes | |
23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47) |
Type Occurrence of Uralborite
Place of Conservation of Type Material:
Vernadsky Geological Museum, Moscow, 48613; A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, 64944, vis3597.
Associated Minerals at Type Locality:
Reference:
Malinko, S.V. (1961) New boron minerals — uralborite and pentahydroborite. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva: 90(6): 673-681.
Other Language Names for Uralborite
Related Minerals - Strunz-mindat Grouping
6.DA.10 | Borax | Na2(B4O5)(OH)4 · 8H2O |
6.DA.15 | Tincalconite | Na2(B4O7) · 5H2O |
6.DA.20 | Hungchaoite | Mg(B4O7) · 9H2O |
6.DA.25 | Fedorovskite | Ca2Mg2B4O7(OH)6 |
6.DA.25 | Roweite | Ca2Mn2+2B4O7(OH)6 |
6.DA.30 | Hydrochlorborite | Ca4B8O15Cl2 · 21H2O |
6.DA.40 | Borcarite | Ca4Mg(B4O6(OH)6)(CO3)2 |
6.DA.40 | Numanoite | Ca4Cu(B4O6(OH)6)(CO3)2 |
6.DA.60 | Fontarnauite | (Na,K)2(Sr,Ca) (SO4)[B5O8(OH)] · 2H2O |
Fluorescence of Uralborite
Fluoresces violet under LW UV.
Other Information
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 Uralborite
mindat.org URL:
https://www.mindat.org/min-4097.html
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Please feel free to link to this page.
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References for Uralborite
Reference List:
IMA (1967) International Mineralogical Association: Commission on New Minerals and Mineral Names. Mineralogical Magazine and Journal of the Mineralogical Society, 36 (277) 131-136 doi:10.1180/minmag.1967.036.277.20
Localities for Uralborite
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.
Japan | |
| Kusachi et al. (2000) +2 other references |
Russia (TL) | |
| [AmMin 85:1322] +1 other reference |
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Fuka mine, Fuka, Bitchū, Takahashi City, Okayama Prefecture, Japan