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Brewsterite-Ba

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Old Luganure mine, Glendasan, Co. Wicklow, Ireland
© Dr Stephen Moreton

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Formula:
(Ba,Sr)[Al
 
2
Si
 
6
O
 
16
] · 5H
 
2
O
System:MonoclinicColour:White, Colorless, Pale ...
Lustre:VitreousHardness:5
Name:
Named after David Brewster (1781-1868), Scottish physicist, who studied the optical properties of minerals and the element Strontium. The Ba-dominant member of the Brewsterite series.


Zeolite Group. The barium analogue of Brewsterite-Sr.

Classification of Brewsterite-Ba

IMA status:Approved
Strunz 8th edition ID:8/J.23-90
Nickel-Strunz 10th (pending) edition ID:9.GE.20

9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H2O; zeolite family
E : Chains of T10O20 Tetrahedra
Dana 7th edition ID:77.1.7.1
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Type Occurrence of Brewsterite-Ba

Co-type Localities:Cerchiara Mine, Borghetto Vara, Vara Valley, La Spezia Province, Liguria, Italy
Gouverneur Talc Company No. 4 Quarry (Valentine deposit; Valentine property), Harrisville, Diana Township, Lewis Co., New York, USA

Physical Properties of Brewsterite-Ba

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:White, Colorless, Pale Pink
Hardness (Mohs):5
Density (measured):2.453 g/cm3
Density (calculated):2.5 g/cm3

Crystallography of Brewsterite-Ba

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/m {P1 1 21/m} {P21/m} {P1 21/m 1}

Optical Data of Brewsterite-Ba

Type:Biaxial (+)
RI values: nα = 1.510 - 1.514 nβ = 1.512 - 1.516 nγ = 1.523 - 1.528
2V:Measured: 44° to 45°, Calculated: 46° to 48°
Maximum Birefringence:δ = 0.013 - 0.014

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low
Dispersion:strong

Chemical Properties of Brewsterite-Ba

Formula:
(Ba,Sr)[Al
 
2
Si
 
6
O
 
16
] · 5H
 
2
O
Essential elements:Al, Ba, H, O, Si
All elements listed in formula:Al, Ba, H, O, Si, Sr

Relationship of Brewsterite-Ba to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.GE.05Clinoptilolite-Ca
(Ca,Na,K)
 
2-3
Al
 
3
(Al,Si)
 
2
Si
 
13
O
 
36
·12H
 
2
O
9.GE.05Clinoptilolite-K
(K,Na,Ca)
 
2-3
Al
 
3
(Al,Si)
 
2
Si
 
13
O
 
36
·12H
 
2
O
9.GE.05Clinoptilolite-Na
(Na,K,Ca)
 
2-3
Al
 
3
(Al,Si)
 
2
Si
 
13
O
 
36
·12H
 
2
O
9.GE.05Heulandite-Ca
(Ca,Na)
 
2-3
Al
 
3
(Al,Si)
 
2
Si
 
13
O
 
36
·12H
 
2
O
9.GE.05Heulandite-K
(K,Na,Ca)
 
2-3
Al
 
3
(Al,Si)
 
2
Si
 
13
O
 
36
·12H
 
2
O
9.GE.05Heulandite-Na
(Na,Ca)
 
2-3
Al
 
3
(Al,Si)
 
2
Si
 
13
O
 
36
·12H
 
2
O
9.GE.05Heulandite-Sr
(Sr,Na,Ca)
 
2-3
Al
 
3
(Al,Si)
 
2
Si
 
13
O
 
36
·12H
 
2
O
9.GE.05Heulandite-Ba
(Ba,Ca,K,Na,Sr)
 
5
Al
 
9
Si
 
27
O
 
72
·22H
 
2
O
9.GE.10Stilbite-Ca
NaCa
 
4
[Al
 
9
Si
 
27
O
 
72
] · nH
 
2
O
9.GE.10Stilbite-Na
Na
 
3
Ca
 
3
[Al
 
8
Si
 
28
O
 
72
]·nH
 
2
O
9.GE.15Barrerite
(Na,K,Ca
 
0.5
)
 
2
[Al
 
2
Si
 
7
O
 
18
] · 7H
 
2
O
9.GE.15Stellerite
Ca[Al
 
2
Si
 
7
O
 
18
] · 7H
 
2
O
9.GE.20Brewsterite-Sr
(Sr,Ba,Ca)[Al
 
2
Si
 
6
O
 
16
] · 5H
 
2
O
Related Minerals - Dana Grouping):

- +
77.1.7.2Yugawaralite
CaAl
 
2
Si
 
6
O
 
16
·4H
 
2
O

Other Names for Brewsterite-Ba

Synonyms:
Barium-Brewsterite
Other Languages:
Russian:Брюстерит-Ba

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Brewsterite-Ba

Reference List: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.

Robinson, G.W. & Grice, J.D. (1993): The barium analog of brewsterite from Harrisville, New York. Canadian Mineralogist. 31, 687-690.

Coombs, D.S. et Al. (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, 1571-1606.

Alberti, A., Sacerdoti, M., Quartieri, S., Vezzalini, G. (1999): Heating-induced phase transformation in zeolite brewsterite: new 4- and 5-coordinated (Si,Al) sites. Physics and Chemistry of Minerals, 26, 181-186.

Sacerdoti, M., Vezzalini, G., Quartieri, S. (2000): Dehydration mechanism in brewsterite: Single crystal X-ray diffraction study. Microporous and Mesoporous Materials, 41, 107-118.

Internet Links for Brewsterite-Ba

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    Localities for Brewsterite-Ba

    Hide Locality List
    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Canada
     
    • Ontario
      • Peterborough Co.
        • Methuen Township
    		van Velthuizen, J. (2006): Zeolite occurrences in the Central Metasedimentary Belt of the Grenville Province, Ontario, Quebec and New York State. Mineralogical Record 37 (4): 283-296
    Ireland
     
    • Co. Wicklow
      • Glendasan
    		Green, D.I., Tindle, A.G. & Moreton, S. (2005) Brewsterite-Ba and harmotome from the Wicklow lead mines, Co. Wicklow, Ireland. Irish J. Earth Sci., 23, 101-6.
    Italy
     
    • Liguria
      • La Spezia Province
        • Vara Valley
          • Borghetto Vara
    		European Journal of Mineralogy, 5, 353-360.
    Norway
     
    • Buskerud
      • Flesberg
        • Svene
          • Kongsberg Silver Mining District
            • Vinoren Silver Mine Field
              • Vinoren Southern Mines
    		Larsen, A.O.; Nordrum, F.S. & Erambert, M. (2003): Mineraler i brewsterittserien fra norske lokaliteter. Bergverksmuseet Skrift 25: 41-42
      • Kongsberg
        • Kongsberg Silver Mining District
          • Overberget Mine-field
    		Larsen, A.O.; Nordrum, F.S. & Erambert, M. (2003): Mineraler i brewsterittserien fra norske lokaliteter. Bergverksmuseet Skrift 25: 41-42
    • Oppland
      • Sel
        • Sjoa
    		Larsen, A.O.; Nordrum, F.S. & Erambert, M. (2003): Mineraler i brewsterittserien fra norske lokaliteter. Bergverksmuseet Skrift 25: 41-42
    UK
     
    • Scotland
      • North West Highlands (Argyllshire)
    		Probed (Marco E. Ciriotti information)
    USA
     
    • New York
    		No reference listed
        • Diana Township
          • Harrisville
    		Robinson, G.W. & Grice, J.D. (1993): The barium analog of brewsterite from Harrisville, New York. Canadian Mineralogist, 31, 676-690.
    Mineral and/or Locality
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