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Shimazakiite
A valid IMA mineral species
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About Shimazakiite
Dr. Hidehiko Shimazaki
Formula:
Ca2B2-xO5-3x(OH)3x (x = 0~0.06)
3 OH partially replace 1 BO3 group.
Colour:
Grayish white
Lustre:
Vitreous
Crystal System:
Monoclinic
Name:
Named in honor of Dr. Hidehiko Shimazaki (島崎英彦) (2 June 1939, Tokyo, Japan), professor emeritus of Tokyo University, in recognition of his contributions to skarn mineralogy.
Unique Identifiers
Mindat ID:
41969
Long-form identifier:
mindat:1:1:41969:3
IMA Classification of Shimazakiite
Approved
IMA Formula:
Ca2B2O5
Approval year:
2010
First published:
2013
Type description reference:
Kusachi, I., Kobayashi, S., Takechi, Y., Nakamuta, Y., Nagase, T., Yokoyama, K., Momma, K., Miyawaki, R., Shigeoka, M., Matsubara, S. (2013) Shimazakiite-4M and shimazakiite-4O, Ca2B2O5, two polytypes of a new mineral from Fuka, Okayama Prefecture, Japan. Mineralogical Magazine, 77 (1) 93-105 doi:10.1180/minmag.2013.077.1.09
Classification of Shimazakiite
6.BC.25
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 |
|---|---|---|
| Smz | 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 Shimazakiite
Vitreous
Colour:
Grayish white
Streak:
White
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Optical Data of Shimazakiite
Type:
Biaxial (-)
Pleochroism:
Non-pleochroic
Chemistry of Shimazakiite
Mindat Formula:
Ca2B2-xO5-3x(OH)3x (x = 0~0.06)
3 OH partially replace 1 BO3 group.
3 OH partially replace 1 BO3 group.
Elements listed:
Crystallography of Shimazakiite
Polytype:
Formula:
Crystal System:
Class (H-M)
Space Group:
Space Group Setting:
Cell Parameters:
Ratio:
Unit Cell Volume (calc):
Z:
Comment:
| Shimazakiite-4M | Shimazakiite-4O |
|---|---|
| Ca2B2-xO5-3x(OH)3x (x = 0~0.06) | Ca2B2-xO5-3x(OH)3x (x = 0~0.06) |
| Monoclinic | Orthorhombic |
| 2/m - Prismatic | 222 - Disphenoidal |
| P21/c | P212121 |
| P21/c | |
| a = 3.5485(12) Å, b = 6.352(2) Å, c = 19.254(6) Å β = 92.393(13)° | a = 3.55645(18) Å, b = 6.35194(15) Å, c = 19.2534(5) Å |
| a:b:c = 0.559 : 1 : 3.031 | a:b:c = 0.56 : 1 : 3.031 |
| V 433.61 ų (Calculated from Unit Cell) | V 434.94 ų (Calculated from Unit Cell) |
| 4 | 4 |
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| - Å | () |
Reference:
Kusachi, I., Kobayashi, S., Takechi, Y., Nakamuta, Y., Nagase, T., Yokoyama, K., Momma, K., Miyawaki, R., Shigeoka, M., Matsubara, S. (2013) Shimazakiite-4M and shimazakiite-4O, Ca2B2O5, two polytypes of a new mineral from Fuka, Okayama Prefecture, Japan. Mineralogical Magazine, 77 (1) 93-105 doi:10.1180/minmag.2013.077.1.09
Comments:
X-ray powder diffraction data can be found on the polytype pages.
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 Shimazakiite
General Appearance of Type Material:
Shimazakiite forms aggregates up to 3 mm where shimazakiite-4M tends to occur in nanometer-sized twin lamellae and shimazakiite-4O in micrometer-sized lamellae.
Place of Conservation of Type Material:
National Museum of Nature and Science, Tokyo, Japan.
Geological Setting of Type Material:
In irregular vein in crystalline limestone near gehlenite-spurrite skarns
Associated Minerals at Type Locality:
Reference:
Kusachi, I., Kobayashi, S., Takechi, Y., Nakamuta, Y., Nagase, T., Yokoyama, K., Momma, K., Miyawaki, R., Shigeoka, M., Matsubara, S. (2013) Shimazakiite-4M and shimazakiite-4O, Ca2B2O5, two polytypes of a new mineral from Fuka, Okayama Prefecture, Japan. Mineralogical Magazine, 77 (1) 93-105 doi:10.1180/minmag.2013.077.1.09
Synonyms of Shimazakiite
Other Language Names for Shimazakiite
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 | Parasibirskite | Ca2(B2O5) · H2O |
| 6.BC.20 | Sibirskite | Ca2(HB2O5)(OH) |
Fluorescence of Shimazakiite
None
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 Shimazakiite
mindat.org URL:
https://www.mindat.org/min-41969.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Shimazakiite
Reference List:
Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2011) New minerals and nomenclature modifications approved in 2011, CNMNC Newsletter No. 10. Mineralogical Magazine, 75 (5) 2549-2561 doi:10.1180/minmag.2011.075.5.2549
Kusachi, I., Kobayashi, S., Takechi, Y., Nakamuta, Y., Nagase, T., Yokoyama, K., Momma, K., Miyawaki, R., Shigeoka, M., Matsubara, S. (2013) Shimazakiite-4M and shimazakiite-4O, Ca2B2O5, two polytypes of a new mineral from Fuka, Okayama Prefecture, Japan. Mineralogical Magazine, 77 (1) 93-105 doi:10.1180/minmag.2013.077.1.09
Localities for Shimazakiite
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) | |
| Williams et al. (2011) +3 other references |
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Fuka mine, Fuka, Bitchū, Takahashi City, Okayama Prefecture, Japan