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Saru river, Biratori, Hidaka Province, Hokkaido Island, Japan

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At some spots along the banks of the Saru river there are outcrops of a very peculiar fossiliferous sandstone of the Miocene Takinoue Formation whose dominant mineral constituent is lenticular grains of serpentine! Apart from the serpentine minerals, the other minerals present are minor amounts of detrital grains from a variety of source rocks, of no particular interest. Discovered in 1961.





 Map Reference: 42°43'35"N , 142°19'50"E

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Mineral List:
  		•  Augite
    (Ca,Na)(Mg,Fe
    2+
     
    		,Al,Fe
    3+
     
    		,Ti)[(Si,Al)
     
    2
    		O
     
    6
    		]
    Reference: [H. Okada (1964) Memoirs of the Faculty of Science, Kyushu University, Series D, Geology, 15, #1, 23-38.]
  		•  Biotite
    Reference: [H. Okada (1964) Memoirs of the Faculty of Science, Kyushu University, Series D, Geology, 15, #1, 23-38.]
  		•  'Chlorite Group'
    Reference: [H. Okada (1964) Memoirs of the Faculty of Science, Kyushu University, Series D, Geology, 15, #1, 23-38.]
  		•  Clinochrysotile
    Reference: [H. Okada (1964) Memoirs of the Faculty of Science, Kyushu University, Series D, Geology, 15, #1, 23-38.]
  		•  Epidote
    {Ca
     
    2
    		}{Al
     
    2
    		Fe
    3+
     
    		}[O|OH|SiO
     
    4
    		|Si
     
    2
    		O
     
    7
    		]
    Reference: [H. Okada (1964) Memoirs of the Faculty of Science, Kyushu University, Series D, Geology, 15, #1, 23-38.]
  		•  'Garnet Group'
    X
     
    3
    		Z
     
    2
    		(TO
     
    4
    		)
     
    3
    		 (X = Ca, Fe, etc·, Z = Al, Cr, etc·, T = Si, As, V)
    Reference: [H. Okada (1964) Memoirs of the Faculty of Science, Kyushu University, Series D, Geology, 15, #1, 23-38.]
  		•  Glauconite
    K
     
    0.08
    		R
    1
    1.33
    		 R
    2
    0.67
    		 [][Al
     
    0.13
    		Si
     
    3.87
    		O
     
    10
    		](OH)
     
    2
    Reference: [H. Okada (1964) Memoirs of the Faculty of Science, Kyushu University, Series D, Geology, 15, #1, 23-38.]
  		•  Glaucophane
    [ ][Na
     
    2
    		][Mg
     
    3
    		Al
     
    2
    		][(OH)
     
    2
    		|Si
     
    8
    		O
     
    22
    		]
    Reference: [H. Okada (1964) Memoirs of the Faculty of Science, Kyushu University, Series D, Geology, 15, #1, 23-38.]
  		•  'Hornblende'
    Reference: [H. Okada (1964) Memoirs of the Faculty of Science, Kyushu University, Series D, Geology, 15, #1, 23-38.]
  		•  Hypersthene
    (Fe,Mg)SiO
     
    3
    Reference: [H. Okada (1964) Memoirs of the Faculty of Science, Kyushu University, Series D, Geology, 15, #1, 23-38.]
  		•  Lizardite
    Mg
     
    3
    		[(OH)
     
    4
    		|Si
     
    2
    		O
     
    5
    		]
    Reference: [H. Okada (1964) Memoirs of the Faculty of Science, Kyushu University, Series D, Geology, 15, #1, 23-38.]
  		•  Magnesiochromite
    MgCr
     
    2
    		O
     
    4
    Reference: [H. Okada (1964) Memoirs of the Faculty of Science, Kyushu University, Series D, Geology, 15, #1, 23-38.]
  		•  Magnetite
    Fe
    2+
     
    		Fe
    3+
    2
    		O
     
    4
    Reference: [H. Okada (1964) Memoirs of the Faculty of Science, Kyushu University, Series D, Geology, 15, #1, 23-38.]
  		•  'Pumpellyite'
    Reference: [H. Okada (1964) Memoirs of the Faculty of Science, Kyushu University, Series D, Geology, 15, #1, 23-38.]
  		•  Rutile
    TiO
     
    2
    Reference: [H. Okada (1964) Memoirs of the Faculty of Science, Kyushu University, Series D, Geology, 15, #1, 23-38.]
  		•  'Tourmaline'
    Reference: [H. Okada (1964) Memoirs of the Faculty of Science, Kyushu University, Series D, Geology, 15, #1, 23-38.]
  		•  Zircon
    Zr[SiO
     
    4
    		]
    Reference: [H. Okada (1964) Memoirs of the Faculty of Science, Kyushu University, Series D, Geology, 15, #1, 23-38.]


    17 entries listed. 9 valid minerals.

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