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Summit Rock, Klamath Co., Oregon, USA

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Summit Rock is located approximately 390 meters east of Klamath County's western boundary with Douglas County.
It is an andesitic plug, some 60 meters high by 200 meters in diameter.

GPS coordinates: 10T 0575214 4772131.

NOTE: Material originally thought to be ferrosilite turned out to be enstatite, var. bronzite (Bill Wise, Northern California Mineralogical Association spring 2003 newsletter; Micro Probe 9(8), 2003).





Mineral List:
  		•  Aegirine
    NaFe
    3+
     
    		[Si
     
    2
    		O
     
    6
    		]
    Reference: [MinRec 16:143]
    Site Photo
    Summit Rock, Klamath Co., Oregon, USA
    © DM06
  		•  Albite
    Na[AlSi
     
    3
    		O
     
    8
    		]
    Reference: [Donald G. Howard (2008) International Micromounters Journal, 15, #3&4, 3-6.]
  		•  Andradite
    Ca
     
    3
    		Fe
    3+
    2
    		[SiO
     
    4
    		]
     
    3
    Reference: [Donald G. Howard (2008) International Micromounters Journal, 15, #3&4, 3-6.]
  		•  Anorthite
    Ca[Al
     
    2
    		Si
     
    2
    		O
     
    8
    		]
    Reference: [Donald G. Howard (2008) International Micromounters Journal, 15, #3&4, 3-6.]
  		•  Anorthite
    var: Bytownite
    (Ca,Na)[Al(Al,Si)Si
     
    2
    		O
     
    8
    		]
    Reference: [Donald G. Howard (2008) International Micromounters Journal, 15, #3&4, 3-6.]
  		•  Apatite-(CaF)
    Ca
     
    5
    		[F|(PO
     
    4
    		)
     
    3
    		]
    Reference: [Cavity Minerals At Summit Rock by Wallace D. Kleck, American Mineralogist Vol 55]
    Site Photo
    Summit Rock, Klamath Co., Oregon, USA
     
  		•  Augite
    (Ca,Na)(Mg,Fe
    2+
     
    		,Al,Fe
    3+
     
    		,Ti)[(Si,Al)
     
    2
    		O
     
    6
    		]
    Reference: [Cavity Minerals At Summit Rock by Wallace D. Kleck, American Mineralogist Vol 55]
    Site Photo
    Summit Rock, Klamath Co., Oregon, USA
    © DM06
  		•  Chrysocolla
    (Cu,Al)
     
    2
    		H
     
    2
    		Si
     
    2
    		O
     
    5
    		(OH)
     
    4
    		·nH
     
    2
    		O
    Reference: [Micro Probe Vol. 10 No. 6]
    Site Photo
    Summit Rock, Klamath Co., Oregon, USA
    © Stephan Wolfsried
  		•  Cristobalite
    SiO
     
    2
    Reference: [Cavity Minerals At Summit Rock by Wallace D. Kleck, American Mineralogist Vol 55]
  		•  Cuprorivaite
    CaCu[Si
     
    4
    		O
     
    10
    		]
    Reference: [Micro Probe Vol. 10 No. 6]
    Site Photo
    Summit Rock, Klamath Co., Oregon, USA
    © Brent Thorne
  		•  Enstatite
    Mg
     
    2
    		[SiO
     
    3
    		]
     
    2
    Reference: []
    Site Photo
    Summit Rock, Klamath Co., Oregon, USA
    © DM06
  		•  Enstatite
    var: Bronzite
    (Mg,Fe
    2+
     
    		)
     
    2
    		[SiO
     
    3
    		]
     
    2
    Reference: []
    Site Photo
    Summit Rock, Klamath Co., Oregon, USA
    © Saul Krotki 2003
  		•  Ferrosilite
    Fe
     
    2
    		[SiO
     
    3
    		]
     
    2
    Description: Reported "ferrosilite" is really the bronzite variety of Enstatite.
    Reference: [(Bill Wise, Northern California Mineralogical Association spring 2003 newsletter; Micro Probe 9(8), 2003).]
  		•  Fluoro-edenite
    Na[Ca
     
    2
    		][Mg
     
    5
    		][(F,OH)
     
    2
    		|AlSi
     
    7
    		O
     
    22
    		]
    Description: This material had previously been considered to be "magnesiohornblende".) (ID was corrected by Etienne Medard and Donald G. Howard)
    Reference: [Micro Probe Fall 2007 Volume X Number 6]
    Site Photo
    Summit Rock, Klamath Co., Oregon, USA
    © 2008, JGW
  		•  Hematite
    Fe
     
    2
    		O
     
    3
    Reference: [Cavity Minerals At Summit Rock by Wallace D. Kleck, American Mineralogist Vol 55]
    Site Photo
    Summit Rock, Klamath Co., Oregon, USA
    © DM 01/08
  		•  Hypersthene
    (Fe,Mg)SiO
     
    3
    Reference: [Donald G. Howard (2008) International Micromounters Journal, 15, #3&4, 3-6.]
    Site Photo
    Summit Rock, Klamath Co., Oregon, USA
    © 2008 Jesse Crawford
  		•  Ilmenite
    Fe
    2+
     
    		TiO
     
    3
    Reference: [Cavity Minerals At Summit Rock by Wallace D. Kleck, American Mineralogist Vol 55]
    Site Photo
    Summit Rock, Klamath Co., Oregon, USA
    © Saul Krotki 2003
  		•  Magnesiohornblende
    ☐[Ca
     
    2
    		][Mg
     
    4
    		Al][(OH)
     
    2
    		|AlSi
     
    7
    		O
     
    22
    		]
    Description: (ID was corrected by Etienne Medard and Donald G. Howard.)
    Reference: [(Material previously labelled "magnesiohornblende" is now known to be fluoroedenite.)]
  		•  Magnetite
    Fe
    2+
     
    		Fe
    3+
    2
    		O
     
    4
    Reference: [Cavity Minerals At Summit Rock by Wallace D. Kleck, American Mineralogist Vol 55]
  		•  Opal
    var: Opal-AN
    SiO
     
    2
    		·nH
     
    2
    		O
    Reference: [Cavity Minerals At Summit Rock by Wallace D. Kleck, American Mineralogist Vol 55]
  		•  Phlogopite
    KMg
     
    3
    		[(OH,F)
     
    2
    		|AlSi
     
    3
    		O
     
    10
    		]
    Reference: [personnel communication from Dr. Donald Howard]
    Site Photo
    Summit Rock, Klamath Co., Oregon, USA
    © DM 06
  		•  Pseudobrookite
    Fe
     
    2
    		TiO
     
    5
    Reference: [Cavity Minerals At Summit Rock by Wallace D. Kleck, American Mineralogist Vol 55]
    Site Photo
    Summit Rock, Klamath Co., Oregon, USA
     
  		•  Rutile
    TiO
     
    2
    Description: Reported "rutile" is really Zircon.
    Reference: [Donald G. Howard (2008) International Micromounters Journal, 15, #3&4, 3-6.]
  		•  Tridymite
    SiO
     
    2
    Reference: [Cavity Minerals At Summit Rock by Wallace D. Kleck, American Mineralogist Vol 55]
    Site Photo
    Summit Rock, Klamath Co., Oregon, USA
    © Saul Krotki 2004
  		•  Volborthite
    Cu
     
    3
    		[(OH)
     
    2
    		|V
     
    2
    		O
     
    7
    		] · 2H
     
    2
    		O
    Reference: [Micro Probe Vol. 10 No. 6]
    Site Photo
    Summit Rock, Klamath Co., Oregon, USA
    © 2002 DM
  		•  Zircon
    Zr[SiO
     
    4
    		]
    Reference: [Cavity Minerals At Summit Rock by Wallace D. Kleck, American Mineralogist Vol 55]
    Site Photo
    Summit Rock, Klamath Co., Oregon, USA
     


    26 entries listed. 19 valid minerals. 3 erroneous literature entries.

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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Jobs in Oregon, 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: 5th Nov 2009 17:07:20