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  1. Imperial

    ... are mica s ( phlogopite , muscovite ?) and acicular minerals (sillimanite?) that occur in aggregate bands up to .45 mm ...

    Ed FitzGerald - 2015-09-05

  2. Appalacian Green

    ... are relatively rare, micas (muscovite, phlogopite?) and acicular sillimanite form aggregates in small bands. An orthopyroxene, based ...

    Ed FitzGerald - 2015-09-05