Sborgite
A valid IMA mineral species - grandfathered
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About Sborgite
Formula:
Na[B5O6(OH)4] · 3H2O
Colour:
Colourless, white
Lustre:
Vitreous
Specific Gravity:
1.713
Crystal System:
Monoclinic
Member of:
Name:
Named after Umberto Sborgi (1883 - 1955), Professor of Chemistry, University of Milano, Italy. He published solubility data on the Na2O−B2O3−H2O system.
Type Locality:
A synthetic dimorph is known (Timper et al., 1990).
An anhydrous analogue is also known (Menchetti & Sabelli, 1978).
An anhydrous analogue is also known (Menchetti & Sabelli, 1978).
Unique Identifiers
Mindat ID:
3548
Long-form identifier:
mindat:1:1:3548:0
Similar Names
| Seaborgite | A valid IMA mineral species | LiK2Na6(UO2)(SO4)5(SO3OH)(H2O) |
IMA Classification of Sborgite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
NaB5O6(OH)4·3H2O
First published:
1957
Classification of Sborgite
6.EA.05
6 : BORATES
E : Pentaborates
A : Neso-pentaborates
6 : BORATES
E : Pentaborates
A : Neso-pentaborates
26.5.1.1
26 : HYDRATED BORATES CONTAINING HYDROXYL OR HALOGEN
5 : Pentaborates
26 : HYDRATED BORATES CONTAINING HYDROXYL OR HALOGEN
5 : Pentaborates
9.1.11
9 : Borates
1 : Borates of the alkalis and boric acid
9 : Borates
1 : Borates of the alkalis and boric acid
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 for Standard |
|---|---|---|
| Srg | 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 Sborgite
Vitreous
Transparency:
Translucent
Colour:
Colourless, white
Streak:
White
Density:
1.713 g/cm3 (Measured) 1.711 g/cm3 (Calculated)
Comment:
Measured on synthetic material
Optical Data of Sborgite
Type:
Biaxial (+)
RI values:
nα = 1.432 - 1.435 nβ = 1.438 nγ = 1.450 - 1.488
2V:
Measured: 35° , Calculated: 38°
Max. Birefringence:
δ = 0.018 - 0.053
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
Surface Relief:
Moderate
Dispersion:
none
Chemistry of Sborgite
Mindat Formula:
Na[B5O6(OH)4] · 3H2O
Element Weights:
Elements listed:
Crystallography of Sborgite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 11.189(8) Å, b = 16.474(14) Å, c = 13.567(9) Å
β = 112.82(3)°
β = 112.82(3)°
Ratio:
a:b:c = 0.679 : 1 : 0.824
Unit Cell V:
2,305.03 ų (Calculated from Unit Cell)
Z:
8
Crystal Structure
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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) |
|---|---|---|---|---|---|---|---|
| 0009465 | Sborgite | Merlino S, Sartori F (1972) The crystal structure of sborgite, NaB5O6(OH)4*3H2O Acta Crystallographica B28 3559-3567 |  | 1972 | synthetic | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.60 Å | (100) |
| 3.30 Å | (80) |
| 3.20 Å | (70) |
| 3.74 Å | (50) |
| 3.18 Å | (50) |
| 4.29 Å | (30) |
| 3.56 Å | (30) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 25 : Evaporites (prebiotic) | |
| Stage 10b: Anthropogenic minerals | <10 Ka |
| 55 : Anthropogenic mine minerals | |
| 57 : Other minerals formed by human processes |
Type Occurrence of Sborgite
General Appearance of Type Material:
White encrustrations intimately mixed with thenardite and sodium borates.
Place of Conservation of Type Material:
University of Florence, Florence, Italy, 16801/702.
Geological Setting of Type Material:
Incrustations formed from low temperature (32 to 60 C) soffioni (volcanic vents).
Associated Minerals at Type Locality:
Other Language Names for Sborgite
Relationship of Sborgite to other Species
Member of:
Other Members of Sborgite Group:
| Santite | K[B5O6(OH)4] · 2H2O | Orth. mm2 : Aba2 |
Structurally related to group(s):
Common Associates
Associations Based on Photo Data:
| 1 photo of Sborgite associated with Thénardite | Na2SO4 |
Related Minerals - Strunz-mindat Grouping
| 6.EA.05 | Leucostaurite | Pb2[B5O9]Cl · 0.5H2O |
| 6.EA.10 | Ramanite-(Rb) | Rb[B5O6(OH)4] · 2H2O |
| 6.EA.10 | Ramanite-(Cs) | Cs[B5O6(OH)4] · 2H2O |
| 6.EA.10 | Santite | K[B5O6(OH)4] · 2H2O |
| 6.EA.15 | Ammonioborite | (NH4)2[B5O6(OH)4]2 · H2O |
| 6.EA.25 | Ulexite | NaCa[B5O6(OH)6] · 5H2O |
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 Sborgite
mindat.org URL:
https://www.mindat.org/min-3548.html
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Please feel free to link to this page.
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References for Sborgite
Reference List:
Merlino, S. (1972) The crystal structure of sborgite, NaB5O6(OH)4·3H2O. Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry, 28 (12) 3559-3567 doi:10.1107/s0567740872008349
Menchetti, S.; Sabelli, C. (1978) The crystal structure of NaB5O6(OH)4. Acta Crystallographica Section B, 34 (1). 45-49 doi:10.1107/s0567740878002289
Timper, Ulrich; Heller, Gert; Shakibaie-Moghadam, Mahmood (1990) Sborgit und β-Sborgit — eine zweite synthetische Modifikation von Na[B5O6(OH)4] · 3 H2O [Sborgite and β-sborgite – a second synthetic modification of Na[B5O6(OH)4] · 3 H2O]. Zeitschrift für Naturforschung B, 45. 1155-1166 doi:10.1515/znb-1990-0810
Localities for Sborgite
Showing 7 localities.
symbol to view information about a locality.
The 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).
All localities listed without proper references should be considered as questionable.
Italy (TL) | |
| Cipriani (1957) +1 other reference |
Sweden | |
| The Sulfur Problem. Proceedings 8th ... +1 other reference |
USA | |
| McAllister (1961) |
| Anthony et al. (2003) |
| McAllister (1961) +2 other references | |
| Erd et al. (1979) |
| McAllister (1961) +2 other references |
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Furnace Creek Mining District, Inyo County, California, USA