Bakerite
A variety of Datolite
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About Bakerite
Richard Charles Baker
Formula:
Ca4(H5B5Si3O20)
Colour:
Colourless, White
Lustre:
Vitreous, Dull
Hardness:
4½
Specific Gravity:
2.88
Crystal System:
Monoclinic
Name:
Named in 1903 by William Brantingham Giles in honor of Richard Charles Baker (1858 Islington, London, England, UK - 1937 California, USA), who discovered the species, then president of the Borax Consolidated Company (formerly the Borax Company Limited) of San Bernardino County, California, USA, and for whom Baker, California, USA is also named. (Earlier, Richard C. Baker was also president of the Pacific Coast Borax Company, a company probably related to his later business interests.)
A variety of Datolite
A microcrystalline, boron-rich variety of datolite. Occurs in various genetic environments among them diabase spilites.
A microcrystalline, boron-rich variety of datolite. Occurs in various genetic environments among them diabase spilites.
Unique Identifiers
Mindat ID:
490 (as Bakerite)
1340 (as Datolite)
1340 (as Datolite)
Long-form identifier:
mindat:1:1:490:5 (as Bakerite)
mindat:1:1:1340:2 (as Datolite)
mindat:1:1:1340:2 (as Datolite)
GUID
(UUID V4):
(UUID V4):
712f1043-8d3c-49ef-b5e2-c524c026221d (as Bakerite)
f1e58e96-bf09-46b7-89c8-b80b5fd307d1 (as Datolite)
f1e58e96-bf09-46b7-89c8-b80b5fd307d1 (as Datolite)
IMA Classification of Bakerite
Discredited
Approval history:
Discredited: IMA 16-A. See Hålenius et al. (2016) and Bačík et al. (2017).
Classification of Bakerite
54.2.1b.1
54 : NESOSILICATES Borosilicates and Some Beryllosilicates
2 : Borosilicates and Some Beryllosilicates with B in [4] coordination
54 : NESOSILICATES Borosilicates and Some Beryllosilicates
2 : Borosilicates and Some Beryllosilicates with B in [4] coordination
17.5.13
17 : Silicates Containing other Anions
5 : Borosilicates
17 : Silicates Containing other Anions
5 : Borosilicates
Physical Properties of Bakerite
Vitreous, Dull
Transparency:
Translucent
Colour:
Colourless, White
Hardness:
4½ on Mohs scale
Density:
2.88 g/cm3 (Measured) 2.94 g/cm3 (Calculated)
Optical Data of Bakerite
Type:
Biaxial (-)
RI values:
nα = 1.624 nβ = 1.635 nγ = 1.654
2V:
Measured: 87° to 88°
Birefringence:
Moderate
Max Birefringence:
δ = 0.030
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:
weak
Chemistry of Bakerite
Mindat Formula:
Ca4(H5B5Si3O20)
Crystallography of Bakerite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Cell Parameters:
a = 4.85 Å, b = 7.627 Å, c = 9.659 Å
β = 90.255°
β = 90.255°
Ratio:
a:b:c = 0.636 : 1 : 1.266
Unit Cell V:
357.29 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Dense and microcrystalline, resembling unglazed porcelain. Nodules and veins. Stout rhombic prisms
X-Ray Powder Diffraction
Image Loading
Radiation - Copper Kα
Data courtesy of RRUFF project at University of Arizona, used with permission.
Geological Environment
Geological Setting:
Veins in altered volcanics.
First Recorded Occurrence of Bakerite
Associated Minerals at First Recorded Locality:
Other Language Names for Bakerite
Common Associates
Associated Minerals Based on Photo Data:
| 4 photos of Bakerite associated with Datolite | CaB(SiO4)(OH) |
| 3 photos of Bakerite associated with Grossular | Ca3Al2(SiO4)3 |
| 2 photos of Bakerite associated with Calcite | CaCO3 |
| 1 photo of Bakerite associated with Botryolite | |
| 1 photo of Bakerite associated with Axinite-(Mn) | Ca2Mn2+Al2BSi4O15(OH) |
| 1 photo of Bakerite associated with Natrolite | Na2Al2Si3O10 · 2H2O |
| 1 photo of Bakerite associated with Vesuvianite | Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 |
| 1 photo of Bakerite associated with Tatarinovite | Ca3Al(SO4)[B(OH)4](OH)6 · 12H2O |
| 1 photo of Bakerite associated with Imayoshiite | Ca3Al(CO3)[B(OH)4](OH)6 · 12H2O |
| 1 photo of Bakerite associated with Leonhardite | CaAl2Si4O12 · 3H2O |
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 Bakerite
mindat.org URL:
https://www.mindat.org/min-490.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
Mineral Dealers:
References for Bakerite
Reference List:
Giles, W. B. (1903) Bakerite (a new borosilicate of calcium) and howlite from California. Mineralogical Magazine and Journal of the Mineralogical Society, 13 (62) 353-355 doi:10.1180/minmag.1903.013.62.12
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2016) New minerals and nomenclature modifications approved in 2016, CNMNC Newsletter No. 33. Mineralogical Magazine, 80 (6) 1135-1144 doi:10.1180/minmag.2016.080.085
Localities for Bakerite
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.
Canada | |
| Perchiazzi et al. (2004) |
China | |
| Möhn et al. (05/2021) |
Italy | |
| |
| 415 (360) +1 other reference |
Japan | |
| Mineralogical Record: 27: 303. +1 other reference |
Mexico | |
| Handbook of Mineralogy (Bakerite) |
| Panczner (1987) | |
| Panczner (1987) | |
| Panczner (1987) | |
New Zealand | |
| Ansin (1970) +1 other reference |
Spain | |
| Calvo (2018) |
Turkey | |
| A Summary and Geological Comparison. ... +1 other reference |
| A Summary and Geological Comparison. ... +2 other references |
| Perchiazzi et al. (2004) |
USA | |
| Murdoch et al. (1966) |
| www.mineralsocal.org. +1 other reference |
| Larsen (1921) +1 other reference |
| American Mineralogist (2004) | |
| Van Nostrand Reinholt Press: 509 +6 other references |
| Harvard Museum of Natural History ... | |
| Palache et al. (1951) |
| Giles (1903) +1 other reference | |
| Dunn (1995) |
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Rio Gavottino, Casarza Ligure, Genoa, Liguria, Italy