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Rock Island Dam, Douglas and Chelan Co. Border, Washington, USA

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Ref: Tschernich (1991): Zeolites of Washington State. Rock & Minerals, 66(4); Tschernich (1992): Zeolites of the World. (166,272,390,400,424); Cannon (1975): Minerals of Washington (87,129,130,133,134)

The vesicular basalt cobbles from which the mineralization is found are located on the eastern bank of the Columbia River at Rock Island Dam, which is in Douglas County. This material was removed from the bed of the river, which spans the border of Douglas and Chelan Counties, during the construction of the dam in the early 1930s and has been in its current location for over 75 years.





 Map Reference: 47°20'34"N , 120°5'33"W

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Group 2 - Sulphides and Sulfosalts
  		• Pyrite2.EB.05a
    FeS
     
    2
    Group 4 - Oxides and Hydroxides
  		• Opal4.DA.10
    SiO
     
    2
    		·nH
     
    2
    		O
    Group 5 - Nitrates and Carbonates
  		• Calcite5.AB.05
    CaCO
     
    3
    Group 9 - Silicates
  		• Clinoptilolite-Ca9.GE.05
    (Ca,Na,K)
     
    2-3
    		Al
     
    3
    		(Al,Si)
     
    2
    		Si
     
    13
    		O
     
    36
    		·12H
     
    2
    		O
  		• Erionite-K9.GD.20
    (K
     
    2
    		,Ca,Na
     
    2
    		)
     
    2
    		[Al
     
    4
    		Si
     
    14
    		O
     
    36
    		] · 15H
     
    2
    		O
  		• Offretite9.GD.25
    KCaMgAl
     
    5
    		Si
     
    13
    		O
     
    36
    		·16H
     
    2
    		O or near
  		• Okenite9.EA.40
    CaSi
     
    2
    		O
     
    5
    		·2H
     
    2
    		O
  		• Paulingite-K (TL)9.GC.35
    (K
     
    2
    		,Ca,Na
     
    2
    		,Ba)
     
    5
    		[Al
     
    10
    		Si
     
    35
    		O
     
    90
    		] · 45H
     
    2
    		O
  		• Phillipsite-K9.GC.10
    (K,Na,Ca
     
    0.5
    		,Ba
     
    0.5
    		)
     
    4-7
    		[Al
     
    4-7
    		Si
     
    12-9
    		O
     
    32
    		]
    .
     
    		 12H
     
    2
    		O
    Unclassified Minerals
  		• 'Chabazite'-
  		• 'Clay'-
  		• 'Heulandite'-


    12 entries listed. 9 valid minerals.

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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Jobs in Washington, USA 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: 22nd Nov 2009 10:43:31