Parasibirskite
A valid IMA mineral species
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About Parasibirskite
Formula:
Ca2(B2O5) · H2O
Colour:
White
Lustre:
Pearly
Hardness:
3
Specific Gravity:
2.50
Crystal System:
Monoclinic
Name:
Named derives from the Greek 'para' for near, and sibirskite, for the polymorphic relationship to that mineral.
Dimorph of:
This page provides mineralogical data about Parasibirskite.
Unique Identifiers
Mindat ID:
7217
Long-form identifier:
mindat:1:1:7217:1
IMA Classification of Parasibirskite
Approved
IMA Formula:
Ca2B2O5(H2O)
Approval year:
1996
First published:
1998
Classification of Parasibirskite
6.BC.20
6 : BORATES
B : Diborates
C : Ino-diborates with triangles and/or tetrahedra
6 : BORATES
B : Diborates
C : Ino-diborates with triangles and/or tetrahedra
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 |
|---|---|---|
| Psib | 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 Parasibirskite
Pearly
Transparency:
Translucent
Comment:
weak
Colour:
White
Streak:
White
Hardness:
3 on Mohs scale
Hardness:
VHN25=109 - 155 kg/mm2 - Vickers
Cleavage:
Perfect
{100}
{100}
Density:
2.50(1) g/cm3 (Measured) 2.54 g/cm3 (Calculated)
Optical Data of Parasibirskite
Type:
Biaxial (+)
RI values:
nα = 1.556(2) nβ = 1.593(2) nγ = 1.663(2)
2V:
Calculated: 75°
Max. Birefringence:
δ = 0.107
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. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
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. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Dispersion:
r > v strong
Chemistry of Parasibirskite
Mindat Formula:
Ca2(B2O5) · H2O
Element Weights:
Elements listed:
Crystallography of Parasibirskite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Setting:
P21/m
Cell Parameters:
a = 6.722(4) Å, b = 5.437(2) Å, c = 3.555(2) Å
β = 93.00(5)°
β = 93.00(5)°
Ratio:
a:b:c = 1.236 : 1 : 0.654
Unit Cell V:
129.75 ų (Calculated from Unit Cell)
Z:
1
Crystal Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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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) |
|---|---|---|---|---|---|---|---|
| 0013138 | Parasibirskite | Takahashi R, Kusachi I, Miura H (2010) Crystal structure of parasibirskite (CaHBO3) and polymorphism in sibirskite and parasibirskite Journal of Mineralogical and Petrological Sciences 105 70-73 | 2010 | Fuka, Okayama Prefecture, Japan | 0 | 293 | |
| 0018465 | Parasibirskite | Sun W, Huang Y-X, Li Z, Pan Y, Mi J-X (2011) Hydrothermal synthesis and single-crystal X-ray structure refinement of three borates: sibirskite, parasibirskite and priceite The Canadian Mineralogist 49 823-834 | 2011 | synthetic | 0 | 173 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.237 Å | (100) |
| 6.73 Å | (70) |
| 2.975 Å | (60) |
| 3.354 Å | (30) |
| 2.855 Å | (20) |
| 1.776 Å | (20) |
| 4.23 Å | (10) |
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 Parasibirskite
General Appearance of Type Material:
Crystals are tabular, in subparallel aggregates, to 40 µm.
Place of Conservation of Type Material:
National Science Museum, Tokyo, Japan.
Geological Setting of Type Material:
Pyrometasomatic products of limestone, later hydrothermally altered.
Associated Minerals at Type Locality:
Synonyms of Parasibirskite
Other Language Names for Parasibirskite
Common Associates
Associations Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 6.BC.10 | Calciborite | Ca(B2O4) |
| 6.BC.15 | Vimsite | CaB2O2(OH)4 |
| 6.BC.20 | Sibirskite | Ca2(HB2O5)(OH) |
| 6.BC.25 | Shimazakiite | Ca2B2-xO5-3x(OH)3x (x = 0~0.06) |
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 Parasibirskite
mindat.org URL:
https://www.mindat.org/min-7217.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Parasibirskite
Reference List:
Kusachi, I., Takechi, Y., Henmi, C., Kobayashi, S. (1998) Parasibirskite, a new mineral from Fuka, Okayama Prefecture, Japan. Mineralogical Magazine, 62 (4) 521-525 doi:10.1180/002646198547891
Jambor, J. L., Puziewicz, J., Roberts, A. C. (1999) New mineral names. American Mineralogist, 84 (4) 685-688 p.686
Localities for Parasibirskite
Showing 1 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.
Japan (TL) | |
| Kusachi et al. (1998) +2 other references |
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Fuka mine, Fuka, Bitchū, Takahashi City, Okayama Prefecture, Japan