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Snapshots

  1. Nature's Stained Glass WIndows

    Snapshot Title: Nature's Stained Glass WIndows
    Taken by: Ron Schott

    Image: Chromitite, peridotite and anorthosite, Rum Layered Intrusion, Rum, Scotland
    Image Owner: Ian Butler



    Description:

    ... only crystalline, not glass.



  2. chromite

    Snapshot Title: chromite
    Taken by: Charles Carrigan

    Image: Chromitite, peridotite and anorthosite, Rum Layered Intrusion, Rum, Scotland
    Image Owner: Ian Butler



    Description:

    euhedral, opaque grains of chromite (ideally FeCr2O4), a spinel group mineral.



  3. plagioclase albite twinning

    Snapshot Title: plagioclase albite twinning
    Taken by: Charles Carrigan

    Image: Chromitite, peridotite and anorthosite, Rum Layered Intrusion, Rum, Scotland
    Image Owner: Ian Butler



    Description:

    a very common type of twinning seen in plagioclase feldspar.



  4. plagioclase carlsbad twin

    Snapshot Title: plagioclase carlsbad twin
    Taken by: Charles Carrigan

    Image: Chromitite, peridotite and anorthosite, Rum Layered Intrusion, Rum, Scotland
    Image Owner: Ian Butler



    Description:

    a type of twinning common in plagioclase, the "carlsbad twin" is one where the grain is split down the middle.