Strontioborite
A valid IMA mineral species
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Formula:
Sr[B8O11(OH)4]
Colour:
Colourless
Lustre:
Vitreous
Hardness:
2½
Specific Gravity:
2.40
Crystal System:
Monoclinic
Name:
The name reflects its composition : a strontium borate.
Unique Identifiers
Mindat ID:
3807
Long-form identifier:
mindat:1:1:3807:8
IMA Classification of Strontioborite
Approved
Approval history:
first discredited; then (2020) re-approved
Type description reference:
Classification of Strontioborite
6.FC.10
6 : BORATES
F : Hexaborates
C : Phyllo-hexaborates
6 : BORATES
F : Hexaborates
C : Phyllo-hexaborates
25.6.3.1
25 : ANHYDROUS BORATES CONTAINING HYDROXYL OR HALOGEN
6 : Hexaborates
25 : ANHYDROUS BORATES CONTAINING HYDROXYL OR HALOGEN
6 : Hexaborates
9.3.26
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 |
|---|---|---|
| Srbo | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Pronunciation of Strontioborite
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon Ralph | United Kingdom |
Physical Properties of Strontioborite
Vitreous
Transparency:
Transparent
Colour:
Colourless
Streak:
White
Hardness:
2½ on Mohs scale
Tenacity:
Very brittle
Cleavage:
Perfect
Perfect, mica-like cleavage on {100}
Perfect, mica-like cleavage on {100}
Fracture:
Step-Like
Comment:
stepped or laminated
Density:
2.40(2) g/cm3 (Measured) 2.35 g/cm3 (Calculated)
Optical Data of Strontioborite
Type:
Biaxial (+)
RI values:
nα = 1.470(2) nβ = 1.510(2) nγ = 1.579(2)
2V:
Measured: 85° (5), Calculated: 77.5°
Max. Birefringence:
δ = 0.109
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:
relatively weak
Orientation:
Elongation is positive or negative (for different crystals), inclined.
Pleochroism:
Non-pleochroic
Chemistry of Strontioborite
Mindat Formula:
Sr[B8O11(OH)4]
Element Weights:
Elements listed:
Crystallography of Strontioborite
Crystal System:
Monoclinic
Class (H-M):
2 - Sphenoidal
Space Group:
P21
Setting:
P21
Cell Parameters:
a = 7.6192(3) Å, b = 8.1867(2) Å, c = 9.9164(3) Å
β = 108.357(4)°
β = 108.357(4)°
Ratio:
a:b:c = 0.931 : 1 : 1.211
Unit Cell V:
587.07 ų (Calculated from Unit Cell)
Z:
2
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.22 Å | (100) |
| 5.409 Å | (61) |
| 4.090 Å | (64) |
| 3.300 Å | (48) |
| 3.082 Å | (28) |
| 2.926 Å | (25) |
| 2.121 Å | (30) |
| 2.043 Å | (37) |
Type Occurrence of Strontioborite
General Appearance of Type Material:
lamellar, scaly or tabular crystals up to 2 mm across
Place of Conservation of Type Material:
collections of the Fersman Mineralogical Museum, Russian Academy of Sciences, Leninskiy Prospekt 18-2, Moscow 119071, Russia, registration numbers 69851 (holotype) and ST-7069 (cotype)
Geological Setting of Type Material:
salt dome
Associated Minerals at Type Locality:
Synonyms of Strontioborite
Other Language Names for Strontioborite
Related Minerals - Strunz-mindat Grouping
| 6.FC.05 | Nobleite | CaB6O9(OH)2 · 3H2O |
| 6.FC.05 | Tunellite | SrB6O9(OH)2 · 3H2O |
| 6.FC.15 | Strontioginorite | CaSrB14O20(OH)6 · 5H2O |
| 6.FC.15 | Ginorite | Ca2B14O20(OH)6 · 5H2O |
| 6.FC.20 | Fabianite | CaB3O5(OH) |
Fluorescence of Strontioborite
non-fluorescent under ultraviolet light or an electron beam
Other Information
IR Spectrum:
The IR spectrum of strontioborite is unique and can be used as a reliable diagnostic tool.
Notes:
water insoluble
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 Strontioborite
mindat.org URL:
https://www.mindat.org/min-3807.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
References for Strontioborite
Localities for Strontioborite
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.
Kazakhstan (TL) | |
| Handbook of Mineralogy Vol V p 6 +3 other references |
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