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Petrick pegmatite, Kingsland Granite Company quarry (Petrick quarry), Llano Co., Texas, USA

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Located 1 mile west of the southern tip of Lake Buchanan Llano County, Texas.





Mineral List:
  		•  Albite
    Na[AlSi
     
    3
    		O
     
    8
    		]
    Reference: [Arthur Smith, Frank Roberts, Denise Bicknell (2008) Mineral News, 24, #1, 6-7.]
  		•  'Almandine-Spessartine Series'
    Reference: [Arthur Smith, Frank Roberts, Denise Bicknell (2008) Mineral News, 24, #1, 6-7.]
  		•  'Amphibole Group'
    Reference: [Arthur Smith, Frank Roberts, Denise Bicknell (2008) Mineral News, 24, #1, 6-7.]
  		•  Apatite-(CaF)
    Ca
     
    5
    		[F|(PO
     
    4
    		)
     
    3
    		]
    Habit: Hexagonal
    Colour: Green, Tan
    Fluorescence: Burnt Orange, Green
    Description: Weathered crystals fluoresce burnt-orange. Vug micro crystals are green and gemmy with a brilliant green SW fluorescence.
    Reference: [Self collected by Franklin Roberts, verified by SEM-EDS ]
  		•  Arsenopyrite
    FeAsS - (Fe
     
    0.90
    		Co
     
    0.10
    		)AsS
    Reference: [Arthur Smith, Frank Roberts, Denise Bicknell (2008) Mineral News, 24, #1, 6-7.]
  		•  'Bastnäsite'
    Reference: [Arthur Smith, Frank Roberts, Denise Bicknell (2008) Mineral News, 24, #1, 6-7.]
  		•  Behoite
    Be(OH)
     
    2
    Habit: Amorphous, chalky
    Colour: White, Pinkish-White
    Fluorescence: None
    Description: Occurs as alteration coatings on gadolinite. Initial SEM-EDS analysis indicated a substantial beryllium carbonate content, probably due to reaction with atmospheric carbon dioxide.
    Reference: [Self-Collected by Franklin Roberts]
  		•  Biotite
    Reference: [Self-collected by Franklin Roberts.; Arthur Smith, Frank Roberts, Denise Bicknell (2008) Mineral News, 24, #1, 6-7.]
    Site Photo
    Petrick pegmatite, Kingsland Granite Company quarry (Petrick quarry), Llano Co., Texas, USA
    © 07 David Aldridge
  		•  Britholite-(Y)
    Ca
     
    2
    		(Y,Ca)
     
    3
    		[(OH,F)|(SiO
     
    4
    		,PO
     
    4
    		)
     
    3
    		]
    Reference: [Arthur Smith, Frank Roberts, Denise Bicknell (2008) Mineral News, 24, #1, 6-7.]
  		•  Calcite
    CaCO
     
    3
    Fluorescence: Pale Green (SW)
    Reference: [Arthur Smith, Frank Roberts, Denise Bicknell (2008) Mineral News, 24, #1, 6-7.]
  		•  Chalcopyrite
    CuFeS
     
    2
    Reference: [Arthur Smith, Frank Roberts, Denise Bicknell (2008) Mineral News, 24, #1, 6-7.]
  		•  'Chlorite Group'
    Reference: [Arthur Smith, Frank Roberts, Denise Bicknell (2008) Mineral News, 24, #1, 6-7.]
  		•  'Fergusonite'
    Reference: [Self-collected by Franklin Roberts.]
    Site Photo
    Petrick pegmatite, Kingsland Granite Company quarry (Petrick quarry), Llano Co., Texas, USA
    © 2007, F. Roberts
  		•  Fluorite
    CaF
     
    2
    Habit: massive
    Colour: pale green, lavender, yellow, pink, purple
    Fluorescence: blue-green (SW)
    Description: Highly phosphorescent, thermoluminescent, triboluminescent
    Reference: [Self-collected by Franklin Roberts.; Arthur Smith, Frank Roberts, Denise Bicknell (2008) Mineral News, 24, #1, 6-7.]
  		•  Fergusonite-(Y)
    YNbO
     
    4
    Habit: metamict
    Colour: olive-drab green with metallic sheen on fracture surfaces
    Fluorescence: none
    Description: Commonly found at the outer margins of the pegmatite as columnar metamict crystals having a square cross-section. Moderately radioactive.
    Reference: [Arthur Smith, Frank Roberts, Denise Bicknell (2008) Mineral News, 24, #1, 6-7.]
  		•  'Gadolinite'
    Habit: Amorphous, metamict
    Colour: Greenish-Black
    Fluorescence: None
    Description: This material is actually transparent very dark green. It also displays an unusually high paramagnetism and can be picked up by a Nd-Fe-B "supermagnet".
    Reference: [Self-collected by Franklin Roberts.; Arthur Smith, Frank Roberts, Denise Bicknell (2008) Mineral News, 24, #1, 6-7.]
    Site Photo
    Petrick pegmatite, Kingsland Granite Company quarry (Petrick quarry), Llano Co., Texas, USA
    © 2007, F. Roberts
  		•  Gold ?
    Au
    Reference: [Self-Collected on March, 10, 2007 by David Aldrige, ocurrs as small (<2mm) veins in the coarser part of the pegmatite.]
  		•  Graphite
    C
    Description: Displays pyrolitic properties
    Reference: [Self-collected by David Aldridge, Franklin Roberts]
  		•  'Gummite'
    Habit: amorphous
    Colour: yellow, orange
    Fluorescence: weak green
    Description: Occurs as alteration coatings on uranium-enriched pods of gadolinite and fergusonite
    Reference: [Self-collected by Franklin Roberts.]
  		•  Hematite
    Fe
     
    2
    		O
     
    3
    Reference: [Self-collected by Franklin Roberts.]
  		•  Jarosite
    KFe
    3+
     
     
    3
    		[(OH)
     
    3
    		|SO
     
    4
    		]
     
    2
    Reference: [Self-collected by Franklin Roberts.]
  		•  Magnetite
    Fe
    2+
     
    		Fe
    3+
    2
    		O
     
    4
    Reference: [Self-collected by Franklin Roberts.]
  		•  Marcasite
    FeS
     
    2
    Reference: [Arthur Smith, Frank Roberts, Denise Bicknell (2008) Mineral News, 24, #1, 6-7.]
  		•  Microcline
    K[AlSi
     
    3
    		O
     
    8
    		]
    Fluorescence: Vermillion-red (SW)
    Description: Crystals in pegmatite occur up to 40 cm, sometimes intergrown with orthoclase. These intergrowths display a bright blue schiller that when cabbed displays a blue "cat's eye" effect.
    Reference: [Self-collected by Franklin Roberts.; Arthur Smith, Frank Roberts, Denise Bicknell (2008) Mineral News, 24, #1, 6-7.]
    Site Photo
    Petrick pegmatite, Kingsland Granite Company quarry (Petrick quarry), Llano Co., Texas, USA
    © 07 David Aldridge
  		•  Molybdenite
    MoS
     
    2
    Habit: Foliated books and 5-15 mm thick veins in decomposed granite
    Colour: Lustrous metallic bluish gray
    Fluorescence: None
    Reference: [Self-collected by Franklin Roberts.; Arthur Smith, Frank Roberts, Denise Bicknell (2008) Mineral News, 24, #1, 6-7.]
    Site Photo
    Petrick pegmatite, Kingsland Granite Company quarry (Petrick quarry), Llano Co., Texas, USA
    © 2007, F. Roberts
  		•  Muscovite
    KAl
     
    2
    		[(OH)
     
    2
    		|AlSi
     
    3
    		O
     
    10
    		]
    Reference: [Arthur Smith, Frank Roberts, Denise Bicknell (2008) Mineral News, 24, #1, 6-7.]
  		•  Opal
    SiO
     
    2
    		·nH
     
    2
    		O
    Reference: [Arthur Smith, Frank Roberts, Denise Bicknell (2008) Mineral News, 24, #1, 6-7.]
  		•  Opal
    var: Opal-AN
    SiO
     
    2
    		·nH
     
    2
    		O
    Habit: Thin coatings on quartz and microcline, glassy blebs in vugs amorphous)
    Colour: transparent very pale green
    Fluorescence: Strikingly brilliant green, even visible in overcast daylight.
    Description: Dazzling green fluorescence (SW) especially beautiful when coating microcline with its vermillion red fluorescence.
    Reference: [Self-collected by Franklin Roberts.]
  		•  Powellite
    Ca[MoO
     
    4
    		]
    Colour: Cream White
    Fluorescence: Lemon Yellow (SW)
    Description: Found as crystalline masses interspersed with molybdenite in blocky microcline
    Reference: [Self-collected by Franklin Roberts,]
  		•  Pyrite
    FeS
     
    2
    Reference: [Arthur Smith, Frank Roberts, Denise Bicknell (2008) Mineral News, 24, #1, 6-7.]
  		•  Quartz
    SiO
     
    2
    Reference: [Arthur Smith, Frank Roberts, Denise Bicknell (2008) Mineral News, 24, #1, 6-7.]
  		•  Quartz
    var: Milky Quartz
    Reference: [Self-Collected by Franklin Roberts]
  		•  Quartz
    var: Smoky Quartz
    SiO
     
    2
    Reference: [Self-collected by Franklin Roberts.]
  		•  Rutile
    TiO
     
    2
    Reference: [Arthur Smith, Frank Roberts, Denise Bicknell (2008) Mineral News, 24, #1, 6-7.]
  		•  Samarskite-(Y)
    (Y,Fe
    3+
     
    		,Fe
    2+
     
    		,U,Th,Ca)
     
    2
    		(Nb,Ta)
     
    2
    		O
     
    8
    Reference: [Arthur Smith, Frank Roberts, Denise Bicknell (2008) Mineral News, 24, #1, 6-7.]
  		•  Tengerite-(Y)
    Y
     
    2
    		[CO
     
    3
    		]
     
    3
    		 · 2-3H
     
    2
    		O
    Reference: [Self-Collected 2007 by David Aldridge]
  		•  Thorogummite
    (Th,U)[(OH)
     
    4x
    		|(SiO
     
    4
    		)
     
    1-x
    		]
    Habit: amorphous
    Colour: brick-red
    Fluorescence: none
    Description: Occurs with beohite as a brick-red alteration coating on gadolinite.
    Reference: [Self-collected by Franklin Roberts.]
  		•  Uraninite
    UO
     
    2
    Reference: [Self-collected by Franklin Roberts.]
  		•  Zircon
    Zr[SiO
     
    4
    		]
    Reference: [Arthur Smith, Frank Roberts, Denise Bicknell (2008) Mineral News, 24, #1, 6-7.]
  		•  Zircon
    var: Cyrtolite
    Zr[(SiO
     
    4
    		),(OH)
     
    4
    		]
    Habit: Tetragonal-Bipyramidal with curved faces
    Colour: Reddish-Brown
    Fluorescence: None
    Description: Commonly found between biotite laminae, radioactive
    Reference: [Self-collected by Franklin Roberts.]


    40 entries listed. 27 valid minerals.

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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Jobs in Texas, 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 12:58:39