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La Juanona quarry, Antequera, Málaga, Andalusia, Spain

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(Cantera La Juanona, Antequera, Málaga, Andalucía, España)

Well known locality for blue quartz crystals, sometimes alleged to be coloured by aerinite or magnesioriebeckite, although recent analyses variously gave ferroactinolite, riebeckite or sodic-ferrogedrite.





 Map Reference: 36°59'55"N , 4°33'0"W

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Mineral List:
  		•  Actinolite
    ☐Ca
     
    2
    		(Mg,Fe
    2+
     
    		)
     
    5
    		(Si
     
    8
    		O
     
    22
    		)(OH)
     
    2
    Reference: [Pierre Rondelez]
    Site Photo
    La Juanona quarry, Antequera, Málaga, Andalusia, Spain
    © Pierre Rondelez
  		•  Aerinite ?
    Ca
     
    5
    		(Fe
    3+
     
    		,Al,Fe
    2+
     
    		,Mg)(Al,Mg)
     
    6
    		[HSi
     
    12
    		O
     
    36
    		(OH)
     
    12
    		][(CO
     
    3
    		)
     
    1.2
    		(H
     
    2
    		O)
     
    12
    		]
    Reference: [(alleged by some collectors to be the cause of the color in the famous local blue quartz crystals; but analyses show mainly amphiboles)]
    Site Photo
    La Juanona quarry, Antequera, Málaga, Andalusia, Spain
    © Elmar Lackner
  		•  Albite
    Na[AlSi
     
    3
    		O
     
    8
    		]
    Reference: [Josep Sanchez-Lafuente Mariol specimens and powder XRD.]
  		•  'Apatite'
    Habit: Elongated prismatic
    Reference: [Pierre Rondelez]
  		•  Axinite-(Fe)
    Ca
     
    2
    		Fe
    2+
     
    		Al
     
    2
    		[OH|BSi
     
    4
    		O
     
    15
    		]
    Reference: [Pierre Rondelez]
    Site Photo
    La Juanona quarry, Antequera, Málaga, Andalusia, Spain
    © fabreminerals.com
  		•  Clinochlore
    (Mg,Fe
    2+
     
    		)
     
    5
    		Al[(OH)
     
    8
    		|AlSi
     
    3
    		O
     
    10
    		]
    Reference: [Josep Sanchez-Lafuente Mariol specimens and powder XRD.]
  		•  Epidote
    {Ca
     
    2
    		}{Al
     
    2
    		Fe
    3+
     
    		}[O|OH|SiO
     
    4
    		|Si
     
    2
    		O
     
    7
    		]
    Reference: [Pierre Rondelez]
    Site Photo
    La Juanona quarry, Antequera, Málaga, Andalusia, Spain
    © Pierre Rondelez
  		•  Ferro-Actinolite
    ☐[Ca
     
    2
    		][(Fe
    2+
     
    		,Mg)
     
    5
    		][(OH)
     
    2
    		|Si
     
    8
    		O
     
    22
    		]
    Reference: [Josep Sanchez-Lafuente Mariol specimens and powder XRD.]
  		•  Hematite
    Fe
     
    2
    		O
     
    3
    Reference: [Calvo, M. (2009): Minerales y Minas de España. Vol. IV, Óxidos e Hidróxidos. Escuela Técnica Superior de Ingenieros de Minas de Madrid - Fundación Gómez Pardo. 752 pp]
  		•  Magnetite
    Fe
    2+
     
    		Fe
    3+
    2
    		O
     
    4
    Reference: [Calvo, M. (2009): Minerales y Minas de España. Vol. IV, Óxidos e Hidróxidos. Escuela Técnica Superior de Ingenieros de Minas de Madrid - Fundación Gómez Pardo. 752 pp]
  		•  Pyrite
    FeS
     
    2
    Reference: [Pierre Rondelez]
  		•  Quartz
    SiO
     
    2
    Reference: [Pierre Rondelez]
  		•  Quartz
    var: Blue Quartz
    Reference: [Josep Sanchez-Lafuente Mariol specimens and powder XRD.]
    Site Photo
    La Juanona quarry, Antequera, Málaga, Andalusia, Spain
    © Carlos Pareja
  		•  Riebeckite
    [ ][Na
     
    2
    		][Fe
    2+
    3
    		Fe
    3+
    2
    		][(OH)
     
    2
    		|Si
     
    8
    		O
     
    22
    		]
    Description: "Acabo de analizar una muestra de la costra azul que suele aparecer en la Juanona y alrededores junto al cuarzo azul característico de la zona (Antequera). He empleado SEM (microscopía electrónica de barrido; Philips XL-30LV, 15 kV, BS, presión controlada 0,3 torr, sin recubrimiento), EDS (análisis de emisión de rayos X por dispersión de energía; EDAX UTW Sapphire) y XRD (difracción de rayos X, Philips Xpert, 45 kv, 40 mA). Así, tanto la morfología (vista por SEM, apreciándose el material formado por fibras), como la composición (determinada por EDS, con exiguo contenido en carbono y relación elemental que se ajusta a la estequiometría propia de la serie riebeckita-magnesioriebeckita, con algo de calcio substituyendo al Mg) y la estructura cristalina (establecida por XRD, donde la fase detectada con claridad, además del cuarzo, es riebeckita) confirman que no es aerinita, sino una riebeckita con parte del Fe substituido por Mg y Ca, aunque sin llegar a la estequiometría extrema de la magnesioriebeckita." - Juan Miguel Jiménez
    Reference: [Juan Miguel Jiménez analyses]
  		•  Sodic-ferrogedrite
    [Na][Fe
    2+
    2
    		][Fe
    2+
    4
    		Al][(OH)
     
    2
    		|Al
     
    2
    		Si
     
    6
    		O
     
    22
    		]
    Reference: [Christian Rewitzer collection]
  		•  Titanite
    CaTi[O|SiO
     
    4
    		]
    Reference: [Pierre Rondelez]
    Site Photo
    La Juanona quarry, Antequera, Málaga, Andalusia, Spain
    © Pierre Rondelez


    16 entries listed. 14 valid minerals.

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