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Durham, Lewis Co., Missouri, USA

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An outcrop of the geode-bearing Mississippian age Keokuk formation. Geodes at this site have been found up to 25 cm in diameter and are usually lined with colorless quartz or chalcedony, with a variety of accessory minerals.





 Map Reference: 39°59'N , 91°37'W

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Mineral List:
  		•  Aragonite
    CaCO
     
    3
    Reference: [R&M 73:2 pp 98-117]
  		•  Calcite
    CaCO
     
    3
    Reference: [R&M 73:2 pp 98-117]
  		•  Chalcopyrite
    CuFeS
     
    2
    Reference: [R&M 73:2 pp 98-117]
  		•  Goethite
    α-Fe
    3+
     
    		O(OH)
    Reference: [R&M 73:2 pp 98-117]
  		•  Honessite
    Ni
     
    6
    		Fe
    3+
    2
    		[(OH)
     
    16
    		|SO
     
    4
    		] · 4H
     
    2
    		O
    Habit: Granular to earth aggragates replacing millerite crystals enclosed in calcite
    Colour: olive green
    Fluorescence: None observed
    Description: Found in two geodes which consisted of thick chalcedony shells completely filled with calcite.
    Reference: [R&M 73:2 pp 98-117]
  		•  Malachite
    Cu
     
    2
    		[(OH)
     
    2
    		|CO
     
    3
    		]
    Reference: [R&M 73:2 pp 98-117]
  		•  Millerite
    NiS
    Reference: [R&M 73:2 pp 98-117]
  		•  Pyrite
    FeS
     
    2
    Reference: [R&M 73:2 pp 98-117]
  		•  Quartz
    SiO
     
    2
    Reference: [R&M 73:2 pp 98-117]
  		•  Sphalerite
    (Zn,Fe
    2+
     
    		)S
    Habit: Rude, often distorted tetrahedral crystals
    Colour: Submetallic black
    Fluorescence: None observed
    Description: Usually one large single crystal, up to 4 cm on edge is found in each geode.
    Reference: [R&M 73:2 pp 98-117]
  		•  Szomolnokite
    FeSO
     
    4
    		·H
     
    2
    		O
    Habit: 1 to 2 mm diameter rounded crystals or cavernous elongated bipyramidal crystals
    Colour: bright yellow
    Description: Szomolnokite is known from this locality from one 20 cm diameter geode where it occured in shells of goethite that made up the former surface of 2 to 3 mm oxidized pyrite crystals. Szomolnokite crystals also occured on the surrounding colorless quartz crystals.
    Reference: [R&M 73:2 pp 98-117]


    11 entries listed. 11 valid minerals.

    The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database!
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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Jobs in Missouri, 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: 26th Nov 2009 10:39:33