Mindat Logo
Home Page Log In Message Board The Mindat Directory
Register Search Pages Chat Now! (2 online) Mindat Auctions

Brewsterite-Ba

Big Photo

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

Show Brewsterite-Ba Photos (2)
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
mindat.org URL:http://www.mindat.org/min-6832.html
Please feel free to link to this page.

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

Search Engines:
  • Look for Brewsterite-Ba on Google
  • Look for Brewsterite-Ba images on Google
    • External Links:
  • Look for Brewsterite-Ba on Webmineral
  • Look for Brewsterite-Ba on Athena Mineralogy
  • Look for Brewsterite-Ba on Wikipedia
  • Look for Brewsterite-Ba on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Brewsterite-Ba in the Natural History Museum (London) online catalogue
    • Mineral Dealers:
  • Buy Fine Minerals from mineralsweb.com
  • Fabre Minerals - search for Brewsterite-Ba specimens
  • Mineral Classics - Worldwide Collector Quality Minerals and Gems
  • Rare and Unusual minerals at Mineralogical Research Company
  • SpiriferMinerals.com - high quality low prices
  • Wendel Minerals - Auktion & Shop
  • Top quality minerals from Kristalle of California
  • Buy fine minerals and gemstones from Pala International
  • Wilensky Fine Minerals
  • Buy RARE Minerals from Rocks of Africa
  • Find Brewsterite-Ba on www.crystalclassics.co.uk
  • Edwards Minerals - Fine Specimens
    • Jobs:
  • Mining & Geology Jobs

    • Page Sponsor

    Sponsorship:This page is currently not sponsored. Click here to sponsor this page.

    Localities for Brewsterite-Ba

    Show Locality List (9 Items)
    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.
    Mineral and/or Locality
    Google
     
    www.mindat.org Web
    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 28th Nov 2009 15:42:13