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Blue quartz occurrence, Grabenbach area, Golling, Salzburg, Austria

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(Blauquarz-Fundstelle, Grabenbachgebiet, Golling, Salzburg, Österreich)

Occurrence of blue quartz (also known as sapphire quartz), owing its colour to microscopic inclusions of magnesioriebeckite. The crystals, which are often associated to flawless rock crystals, occur in a vein disseminating a layer of carbonatite-silicate boulders formed by hydrothermal alteration of underlying Werfen slates. Part of the mineralization is genetically related to neighbouring melaphyr-diabases, providing the sodium needed for the formation of the alkali hornblendes.
This locality is known since the late 18th century. Located in the upper Grabenbach valley, about 5 km NE of Golling.

Ref.:
- A. Strasser: Die Minerale Salzburgs (1989)




Group 2 - Sulphides and Sulfosalts
  		• Chalcopyrite2.CB.10a
    CuFeS
     
    2
  		• Millerite2.CC.20
    NiS
  		• Pyrite2.EB.05a
    FeS
     
    2
    Group 4 - Oxides and Hydroxides
  		• Hematite4.CB.05
    Fe
     
    2
    		O
     
    3
  		• Quartz4.DA.05
    SiO
     
    2
      var: Blue Quartz4.DA.05
    SiO
     
    2
      var: Rock Crystal4.DA.05
    SiO
     
    2
    Group 5 - Nitrates and Carbonates
  		• Ankerite5.AB.10
    Ca(Fe
    2+
     
    		 ,Mg,Mn
    2+
     
    		)(CO
     
    3
    		)
     
    2
  		• Magnesite5.AB.05
    MgCO
     
    3
      var: Mesitine Spar5.AB.05
    (Mg,Fe)[CO
     
    3
    		]
  		• Malachite5.BA.10
    Cu
     
    2
    		[(OH)
     
    2
    		|CO
     
    3
    		]
  		• Siderite5.AB.05
    FeCO
     
    3
    Group 7 - Sulphates, Chromates, Molybdates and Tungstates
  		• Gypsum7.CD.40
    Ca[SO
     
    4
    		] · 2H
     
    2
    		O
    Group 9 - Silicates
  		• Aegirine9.DA.25
    NaFe
    3+
     
    		[Si
     
    2
    		O
     
    6
    		]
  		• Magnesioriebeckite9.DE.25
    [ ][Na
     
    2
    		][Mg
     
    3
    		Fe
    3+
    2
    		][(OH)
     
    2
    		|Si
     
    8
    		O
     
    22
    		]
  		• Muscovite
    var: Fuchsite    		9.EC.15
    K(Al,Cr)
     
    3
    		Si
     
    3
    		O
     
    10
    		(OH)
     
    2
  		• Talc9.EC.05
    Mg
     
    3
    		Si
     
    4
    		O
     
    10
    		(OH)
     
    2
  		• Titanite9.AG.15
    CaTi[O|SiO
     
    4
    		]
    Unclassified Minerals
  		• 'Chlorite Group'-
  		• Crossite-
  		• Glauconite-
    K
     
    0.08
    		R
    1
    1.33
    		 R
    2
    0.67
    		 [][Al
     
    0.13
    		Si
     
    3.87
    		O
     
    10
    		](OH)
     
    2
  		• 'K Feldspar'-
  		• Limonite-
    FeO(OH)·nH
     
    2
    		O
  		• Phengite-


    24 entries listed. 19 valid minerals.

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