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|Hardness:||5 - 5½|
Unlike other zeolites, cowlesite has a very limited compositional range (Vezzalini et al., 1992).
Classification of Cowlesite
|Strunz 8th edition ID:||8/J.24-10|
|Nickel-Strunz 10th (pending) edition ID:||9.GG.05|
9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H2O; zeolite family
G : Unclassified zeolites
|Dana 8th edition ID:||220.127.116.11|
77 : TECTOSILICATES Zeolites
1 : Zeolite group - True zeolites
|Hey's CIM Ref.:||16.9.28|
16 : Silicates Containing Aluminum and other Metals
9 : Aluminosilicates of Ca
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Type Occurrence of Cowlesite
|Co-type Localities:||Unnamed wash, adjacent to State Route 177, Superior area, Superior District, Pinal Co., Arizona, USA|
Neer Road, Goble, Columbia Co., Oregon, USA
|Year of Discovery:||1975|
Physical Properties of Cowlesite
|Hardness (Mohs):||5 - 5½|
Crystallography of Cowlesite
|Cell Parameters:||a = 11.27Å, b = 15.25Å, c = 12.61Å|
|Ratio:||a:b:c = 0.739 : 1 : 0.827|
|Unit Cell Volume:||V 2,167.25 Å³ (Calculated from Unit Cell)|
|Comment:||A doubled cell with a 23.3, b 30.6, c 25.0 A is also reported (Vezzalini et al., 1992).|
Optical Data of Cowlesite
|RI values:||nα = 1.505 - 1.513 nβ = 1.509 - 1.516 nγ = 1.509 - 1.518|
|Maximum Birefringence:||δ = 0.004 - 0.005|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Chemical Properties of Cowlesite
|Essential elements:||Al, Ca, H, O, Si|
|All elements listed in formula:||Al, Ca, H, O, Si|
Relationship of Cowlesite to other Species
|Member of:||Zeolite Group|
|Other Members of Group:|
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Cowlesite
|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 Cowlesite
Wise, W.S. & R.W. Tschernich (1975): Cowlesite, a new Ca-zeolite: American Mineralogist 60, 951-956.
Nawaz, R. (1984): New data on cowlesite from Northern Ireland, Mineralogical Magazine, 48, 565-566.
Vezzalini, G., Artioli, G., Quartieri, S., Foy, H. (1992): The crystal chemistry of cowlesite, Mineralogical Magazine, 56, 575-579.
Internet Links for Cowlesite
|Specimens:||The following Cowlesite specimens are currently listed for sale on minfind.com.|
Localities for Cowlesite
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.