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Ward Creek, Cazadero, Sonoma Co., California, USA

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An occurrence in the NE¼ sec. 17, T8N, R11W, MDM, on Ward Creek near Cazadero.



References:
Borg, Iris Y. (1956), Glaucophane schists and eclogite near Healdsburg, California: Geological Society of America Bulletin 67: 1563-1584.

Coleman, R.G. & D.E. Lee (1963), Glaucophane-bearing metamorphic rocks of the Cazadero area, California: Journal of Petrology: 4: 260.

Lee, Donald Edward, Coleman, R.G., Bastron, H., and Smith, V.C. (1966) A two amphibole glaucophane schist in the Franciscan formation, Cazadero area, California. USGS Professional Paper 550-C: 148, 149, 153, 154.

Essene, E.J. and W.S. Fyfe (1967) Omphacite in California metamorphic rocks. Contributions to Mineralogy and Petrology: 15, 23 pp.: 4.

Coleman, R.G. & J.J. Papike (1968), Alkali amphiboles from the blueshchists of Cazadero, California: Jour. Petr.: 9: 109, 111, 113-118.

Himmelberg, G.R. and Papike, J.J. (1969) Coexisting amphiboles from blueschist facies metamorphic rock. Journal of Petrology: 10: 104-113.

Klein, C. (1969) Two-amphibole assemblages in the system actinolite-hornblende-glaucophane. American Mineralogist: 54: 221, 225.

Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 171, 394, 399, 402, 404, 476, 484.

Oh, C. W., Liou, J. G. and Maruyanma, S. (1991). Low-temperature eclogites and eclogitic schists in Mn-rich metabasites in Ward Creek, California; Mn and Fe effects on transition between blueschist and eclogites. Journal of Petrology: 32: 275-301.
[www.minsocam.org/msa/Handbook/Winchite.PDF.]





Mineral List:
  		•  Actinolite
    ☐Ca
     
    2
    		(Mg,Fe
    2+
     
    		)
     
    5
    		(Si
     
    8
    		O
     
    22
    		)(OH)
     
    2
    Description: From metasediments.
    Reference: [Lee, Donald Edward, Coleman, R.G., Bastron, H., and Smith, V.C. (1966) A two amphibole glaucophane schist in the Franciscan formation, Cazadero area, California. USGS Professional Paper 550-C: 148; Coleman, R.G. & D.E. Lee (1963), Glaucophane-bearing metamorphic rocks of the Cazadero area, California: Jour. Petrol.: 4: 260; Himmelberg, G.R. and Papike, J.J. (1969) Coexisting amphiboles from blueschist facies metamorphic rock. Journal of Petrology: 10: 104-113; Klein, C. (1969) Two-amphibole assemblages in the system actinolite-hornblende-glaucophane. American Mineralogist: 54: 221; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 399; www.minsocam.org/msa/Handbook/Winchite.PDF.]
  		•  Albite
    Na[AlSi
     
    3
    		O
     
    8
    		]
    Reference: [www.minsocam.org/msa/Handbook/Winchite.PDF.]
  		•  Crossite
    Reference: [Coleman, R.G. & D.E. Lee (1963), Glaucophane-bearing metamorphic rocks of the Cazadero area, California: Jour. Petrol.: 4: 260; Coleman, R.G. & J.J. Papike (1968), Alkali amphiboles from the blueshchists of Cazadero, California: Jour. Petr.: 9: 109, 111, 113-118; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 404.]
  		•  Epidote
    {Ca
     
    2
    		}{Al
     
    2
    		Fe
    3+
     
    		}[O|OH|SiO
     
    4
    		|Si
     
    2
    		O
     
    7
    		]
    Description: Constitutes an average 19.9% volume per centum of the glaucophane schists.
    Reference: [Lee, Donald Edward, Coleman, R.G., Bastron, H., and Smith, V.C. (1966) A two amphibole glaucophane schist in the Franciscan formation, Cazadero area, California. USGS Professional Paper 550-C: 149; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 484.]
  		•  Glaucophane
    [ ][Na
     
    2
    		][Mg
     
    3
    		Al
     
    2
    		][(OH)
     
    2
    		|Si
     
    8
    		O
     
    22
    		]
    Description: Occurs as glaucophane schist.
    Reference: [Lee, Donald Edward, Coleman, R.G., Bastron, H., and Smith, V.C. (1966) A two amphibole glaucophane schist in the Franciscan formation, Cazadero area, California. USGS Professional Paper 550-C: 153; Essene, E.J. and W.S. Fyfe (1967) Omphacite in California metamorphic rocks. Contributions to Mineralogy and Petrology: 15, 23 pp.: 4; Coleman, R.G. & J.J. Papike (1968), Alkali amphiboles from the blueshchists of Cazadero, California: Jour. Petr.: 9: 109, 111, 113-118; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 394, 404; www.minsocam.org/msa/Handbook/Winchite.PDF.]
    Site Photo
    Ward Creek, Cazadero, Sonoma Co., California, USA
    © 2008 Jesse Crawford
  		•  'Hornblende'
    Reference: [Borg, Iris Y. (1956), Glaucophane schists and eclogite near Healdsburg, California: Geological Society of America Bulletin 67: 1563-1584; Klein, C. (1969) Two-amphibole assemblages in the system actinolite-hornblende-glaucophane. American Mineralogist: 54: 221; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 402.]
  		•  Howieite
    Na(Fe,Mn)
     
    10
    		(Fe,Al)
     
    2
    		Si
     
    12
    		O
     
    31
    		(OH)
     
    13
    Reference: []
  		•  Omphacite
    (Ca,Na)(Mg,Al)[Si
     
    2
    		O
     
    6
    		]
    Description: Occurs in a vuggy vein cutting glaucophane schist.
    Reference: [Essene, E.J. and W.S. Fyfe (1967) Omphacite in California metamorphic rocks. Contributions to Mineralogy and Petrology: 15, 23 pp.: 4; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 394.]
  		•  Quartz
    SiO
     
    2
    Reference: [www.minsocam.org/msa/Handbook/Winchite.PDF.]
  		•  Riebeckite
    [ ][Na
     
    2
    		][Fe
    2+
    3
    		Fe
    3+
    2
    		][(OH)
     
    2
    		|Si
     
    8
    		O
     
    22
    		]
    Reference: [Coleman, R.G. & D.E. Lee (1963), Glaucophane-bearing metamorphic rocks of the Cazadero area, California: Journal of Petrology: 4: 260; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 404.]
  		•  Rutile
    TiO
     
    2
    Description: Contains noteworthy amounts of V, Zr, Cr & Ba. Abundant in glaucophane schists.
    Reference: [Lee, Donald Edward, Coleman, R.G., Bastron, H., and Smith, V.C. (1966) A two amphibole glaucophane schist in the Franciscan formation, Cazadero area, California. USGS Professional Paper 550-C: 148, 149, 153; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 171.]
  		•  Titanite
    CaTi[O|SiO
     
    4
    		]
    Description: The most abundant accessory mineral in the schists.
    Reference: [Lee, Donald Edward, Coleman, R.G., Bastron, H., and Smith, V.C. (1966) A two amphibole glaucophane schist in the Franciscan formation, Cazadero area, California. USGS Professional Paper 550-C: 154; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 476.]
  		•  Winchite
    ☐[CaNa][Mg
     
    4
    		(Al,Fe
    3+
     
    		)][(OH)
     
    2
    		|Si
     
    8
    		O
     
    22
    		]
    Reference: [www.minsocam.org/msa/Handbook/Winchite.PDF.]


    13 entries listed. 11 valid minerals.

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