Brewsterite-Ba
A valid IMA mineral species
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About Brewsterite-Ba
David Brewster
Formula:
(Ba,Sr)[Al2Si6O16] · 5H2O
Colour:
White, colorless, pale pink
Lustre:
Vitreous
Hardness:
4 - 5
Specific Gravity:
2.50
Crystal System:
Monoclinic
Member of:
Name:
Named for its relationship to brewsterite-Sr. It was originally named brewsterite, in 1993, and noted to be barium dominant. In 1997 the IMA Subcommittee on Zeolites promoted brewsterite to a series and designated two species with the dominant extra-framework cation as a suffix. The root name is for David Brewster (1781-1868), Scottish physicist, (11 December 1781, Jedburgh, Scotland - 10 February 1868, Gattonside, Scotland), Scottish physicist, who studied the optical properties of minerals.
Unique Identifiers
Mindat ID:
6832
Long-form identifier:
mindat:1:1:6832:7
GUID
(UUID V4):
(UUID V4):
e0da4120-9591-4e2c-be5d-44b50e872403
IMA Classification of Brewsterite-Ba
Approved
IMA Formula:
Ba(Al2Si6)O16 · 5H2O
First published:
1993
Classification of Brewsterite-Ba
9.GE.20
9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H2O; zeolite family
E : Chains of T10O20 Tetrahedra
9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H2O; zeolite family
E : Chains of T10O20 Tetrahedra
Dana 7th ed.:
77.1.7.1
Mineral Symbols
As of 2021 there are now IMAâCNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Brw-Ba | IMAâCNMNC | Warr, L.N. (2021). IMAâCNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Brewsterite-Ba
Vitreous
Transparency:
Transparent
Colour:
White, colorless, pale pink
Streak:
White
Hardness:
4 - 5 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
Perfect on {010}.
Perfect on {010}.
Fracture:
Conchoidal
Density:
2.50(1) g/cm3 (Measured) 2.5 g/cm3 (Calculated)
Optical Data of Brewsterite-Ba
Type:
Biaxial (+)
RI values:
nα = 1.512 - 1.516 nβ = 1.514 - 1.518 nγ = 1.526 - 1.530
2V:
Measured: 44° to 45°, Calculated: 46° to 48°
Max Birefringence:
δ = 0.014
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:
Low
Optical Extinction:
X ⧠c = 36° (in ÎČ obtuse); Z = b.
Comments:
Robinson and Grice give 2Vmeas = 57(5)°, 2Vcalc = 64(10)°.
Cabella et al. give 2Vmeas = 45(1)°, 2Vcalc = 44°.
Cabella et al. give 2Vmeas = 45(1)°, 2Vcalc = 44°.
Chemistry of Brewsterite-Ba
Mindat Formula:
(Ba,Sr)[Al2Si6O16] · 5H2O
Crystallography of Brewsterite-Ba
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Cell Parameters:
a = 6.790(1) Å, b = 17.581(4) Å, c = 7.735(1) Å
β = 94.50(3)°
β = 94.50(3)°
Ratio:
a:b:c = 0.386 : 1 : 0.44
Unit Cell V:
920.52 Ă
Âł (Calculated from Unit Cell)
Morphology:
Prismatic crystals. Also platy aggregates of flattened, pinacoidal crystals. Crystal tabular on {010} and showing the forms {001}, {010} and {001}.
Twinning:
Lamellar parallel to {010}.
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) |
|---|---|---|---|---|---|---|---|
| 0001844 | Brewsterite-Ba | Akizuki M, Kudoh Y, Kuribayashi T (1996) Crystal structures of the {011}, {610}, and {010} growth sectors in brewsterite American Mineralogist 81 1501-1506 |  | 1996 | 0 | 293 | |
| 0006480 | Brewsterite-Ba | Cabella R, Lucchetti G, Palenzona A, Quartieri S, Vezzalini G (1993) First occurrence of a Ba-dominant brewsterite: structural features European Journal of Mineralogy 5 353-360 | 1993 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.926 Ă | (10) |
| 4.68 Ă | (80) |
| 6.31 Ă | (80) |
| 3.27 Ă | (60) |
| 5.07 Ă | (30) |
| 4.53 Ă | (30) |
| 2.018 Ă | (30) |
| 1.663 Ă | (30) |
Comments:
Gouverneur Talc Company No. 4 Quarry, New York, USA. Data are from Robinson and Grice (1993). Data are essentially the same as from brewserite-Sr.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 22 : Hydration and low-đ subsurface aqueous alteration (see also #23) | |
| 23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47) | |
| High-đ alteration and/or metamorphism | |
| 32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits |
Type Occurrence of Brewsterite-Ba
Co-Type Localities:
General Appearance of Type Material:
Prismatic crystals to 0.2 mm long and as radiating and parallel aggregates (Italy). Platy aggregates of flattened, pinacoidal crystals up to 1 mm across (New York).
Place of Conservation of Type Material:
Canadian Museum of Nature, Ottawa, Ontario, Canada, number 82457 (type).
Geological Setting of Type Material:
In fractures in radiolaritic metacherts and in a schistose metapelite above radiolaritic strata (Italy). In cavities in prehnite in a wollastonite orebody, probably formed by hydrothermal mineralization along fractures (New York).
Associated Minerals at Type Locality:
Reference:
Cabella, R., Lucchetti, G., Palenzona, A., Quartieri, S., Vezzalini, G. (1993): First occurrence of a Ba-dominant brewsterite: structural features. European Journal of Mineralogy. 5, 353-360.
Synonyms of Brewsterite-Ba
Ba Zeolite (in part)
Other Language Names for Brewsterite-Ba
Russian:ĐŃŃŃŃĐ”ŃĐžŃ-Ba
Relationship of Brewsterite-Ba to other Species
Common Associates
Associated Minerals Based on Photo Data:
| 3 photos of Brewsterite-Ba associated with Harmotome | Ba2(Si12Al4)O32 · 12H2O |
| 2 photos of Brewsterite-Ba associated with Hematite | Fe2O3 |
| 2 photos of Brewsterite-Ba associated with Pectolite | NaCa2Si3O8(OH) |
| 2 photos of Brewsterite-Ba associated with Heulandite-Ba | (Ba,Ca,K)5(Si27Al9)O72 · 22H2O |
| 1 photo of Brewsterite-Ba associated with Sphalerite | ZnS |
| 1 photo of Brewsterite-Ba associated with Quartz | SiO2 |
| 1 photo of Brewsterite-Ba associated with Brewsterite-Sr | (Sr,Ba,Ca)[Al2Si6O16] · 5H2O |
Related Minerals - Strunz-mindat Grouping
| 9.GE.05 | Clinoptilolite-Ca | Ca3(Si30Al6)O72 · 20H2O |
| 9.GE.05 | Clinoptilolite-K | K6(Si30Al6)O72 · 20H2O |
| 9.GE.05 | Clinoptilolite-Na | Na6(Si30Al6)O72 · 20H2O |
| 9.GE.05 | Heulandite-Ca | (Ca,Na)5(Si27Al9)O72 · 26H2O |
| 9.GE.05 | Heulandite-K | (K,Ca,Na)5(Si27Al9)O72 · 26H2O |
| 9.GE.05 | Heulandite-Na | (Na,Ca,K)6(Si,Al)36O72 · 22H2O |
| 9.GE.05 | Heulandite-Sr | (Sr,Na,Ca)5(Si27Al9)O72 · 24H2O |
| 9.GE.05 | Heulandite-Ba | (Ba,Ca,K)5(Si27Al9)O72 · 22H2O |
| 9.GE.10 | Stilbite-Ca | NaCa4(Si27Al9)O72 · 28H2O |
| 9.GE.10 | Stilbite-Na | Na9(Si27Al9)O72 · 28H2O |
| 9.GE.15 | Barrerite | Na2(Si7Al2)O18 · 6H2O |
| 9.GE.15 | Stellerite | Ca4(Si28Al8)O72 · 28H2O |
| 9.GE.20 | Brewsterite-Sr | (Sr,Ba,Ca)[Al2Si6O16] · 5H2O |
Fluorescence of Brewsterite-Ba
Material from New York fluoresces bright yellow-green in shortwave ultraviolet light.
Other Information
IR Spectrum:
FTIR spectrum is essentially identical to that of brewsterite-Sr with broad absorption bands at 465, 585, 715, 1025, 1150, 1630, 2360 and 3500 cm-1.
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 Brewsterite-Ba
mindat.org URL:
https://www.mindat.org/min-6832.html
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References for Brewsterite-Ba
Reference List:
Coombs, Douglas S., Alberti, Alberto, Armbruster, Thomas, Artioli, Gilberto, Colella, Carmine, Galli, Ermanno, Grice, Joel D., Liebau, Friedrich, Mandarino, Joseph A., Minato, Hideo, Nickel, Ernest H., Passaglia, Elio, Peacor, Donald R., Quartieri, Simona, Rinaldi, Romano, Ross, Malcolm I., Sheppard, Richard A., Tillmanns, Ekkehart, Vezzalini, Giovanna (1997) Recommended nomenclature for zeolite minerals; report of the Subcommittee on Zeolites of the International Mineralogical Association, Commission on New Minerals and Mineral Names. The Canadian Mineralogist, 35 (6) 1571-1606
Localities for Brewsterite-Ba
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
â - 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 | |
| Van Velthuizen et al. (2006) +1 other reference |
France | |
| Guichon (2006) |
Ireland | |
| Green et al. (2005) |
Italy (TL) | |
| Cabella et al. (1993) |
Norway | |
| Larsen +1 other reference |
| Larsen +1 other reference |
| Nordrum et al. (2017) | |
| Larsen +1 other reference |
UK | |
| Probed (Marco E. Ciriotti information) |
USA (TL) | |
| Robinson et al. (1993) |
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