1. Skip to navigation
  2. Skip to content
  3. Skip to sidebar


Snapshots

  1. Diamond Endsection

    Snapshot Title: Diamond Endsection
    Taken by: Ron Schott

    Image: Hornblende Dacite, Black Butte, California
    Image Owner: Ron Schott



    Description:

    The diamond shape of this hornblende crystal probably indicates a section broken approximately perpendicular to, and viewed down, the crystallographic c-axis.

    The GigaPan's zoom isn't quite deep en...



  2. Cleavage

    Snapshot Title: Cleavage
    Taken by: Ron Schott

    Image: Hornblende Dacite, Black Butte, California
    Image Owner: Ron Schott



    Description:

    You can just about make out the 120 degree angle between the cleavage faces on this hornblende crystal.



  3. Acicular Hornblende Phenocryst

    Snapshot Title: Acicular Hornblende Phenocryst
    Taken by: Ron Schott

    Image: Hornblende Dacite, Black Butte, California
    Image Owner: Ron Schott



    Description:

    Hornblende is the black mineral. The larger hornblende crystals began cooling slowly deep underground, whereas the grey groundmass cooled rapidly when this magma was erupted.