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Amphibole Ingeous Rock Forming Mineral

Mineral Home | Alphabetical | Hardness | Cleavage | Luster | Key>glass | Key<glass Igneous Home | Classification | Bowen's Reaction Series | Keys | Extrusive/Intrusive | Tectonics | Self Tests AMPHIBOLE #2

  &nbsp Sample in diorite
  &nbsp Sample in andesite porphyry     To Amphibole #1
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A ferro-magnesian mineral. Black, shiny, elongate crystals; 60-120o cleavage. Surfaces look broken by numerous parallel lines that might be confused with striations, but these are the cleavages coming to the surface.
  &nbsp In felsic and intermediate igneous rocks amphibole may be confused with biotite but biotite has flat, slick, shiny faces not broken by cleavages.

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