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Crystal Lake Fluoborite occurrence, Crystal Lake, Peterborough Co., Ontario, Canada

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Ref.:
- Geological Survey of Canada Miscellaneous Survey 39.
- Sabina, A. P. (1982): Some rare minerals of the Bancroft area. Mineralogical Record 13, 223-228

In dolomitic crystaline limestone; in pegmatite.

The fluoborite-bearing crystalline limestone is in contact with red granite pegmatite and is exposed by a road-cut on the south side of the Crystal lake Road . Grey peristerite occurs in the pegmatite.





Mineral List:
  		•  Albite
    Na[AlSi
     
    3
    		O
     
    8
    		]
    Reference: [Ref.: Geological Survey of Canada Miscellaneous Survey 39.]
  		•  'Amphibole Group'
    Colour: colorless to light green
    Description: clinoamphibole subgroup
    Reference: [Ref.: Geological Survey of Canada Miscellaneous Survey 39.]
    Site Photo
    Crystal Lake Fluoborite occurrence, Crystal Lake, Peterborough Co., Ontario, Canada
    © M.Adamowicz
  		•  Fluoborite
    Mg
     
    3
    		[(F,OH)
     
    3
    		|BO
     
    3
    		]
    Habit: hexagonal prisms caracterized by rounded edges and absent terminal faces.
    Colour: colorless to cream-white
    Fluorescence: white in SW
    Description: occur individually and as parallel divergent clusters, resembling apatite. Silky to pearly lustre on fresh surfaces, chalky on weathering.
    Reference: [Ref.: Geological Survey of Canada Miscellaneous Survey 39.]
  		•  Fluorite
    CaF
     
    2
    Colour: violet and amber
    Reference: [Ref.: Geological Survey of Canada Miscellaneous Survey 39.]
  		•  Graphite
    C
    Reference: [Ref.: Geological Survey of Canada Miscellaneous Survey 39.]
  		•  'Mica Group'
    Reference: [Ref.: Geological Survey of Canada Miscellaneous Survey 39.]
  		•  Norbergite
    Mg
     
    3
    		[(F,OH)
     
    2
    		|SiO
     
    4
    		]
    Habit: anhedral grains
    Colour: orange
    Reference: [Geological Survey of Canada Miscellaneous Survey 39.]
  		•  Pyrrhotite
    Fe
     
    7
    		S
     
    8
    		, (-4M), also given as Fe
     
    1-x
    		S (x = 0 - 0.2)
    Reference: [Ref.: Geological Survey of Canada Miscellaneous Survey 39.]
  		•  Rutile
    TiO
     
    2
    Reference: [Ref.: Geological Survey of Canada Miscellaneous Survey 39.]
  		•  'Serpentine Group'
    D
     
    2
    		[Si
     
    2
    		O
     
    5
    		](OH)4 + or - nH
     
    2
    		O
    Colour: grey to green
    Reference: [Geological Survey of Canada Miscellaneous Survey 39.]


    10 entries listed. 7 valid minerals.

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