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  1. Lee Marble

    ... Most are uniaxial negative with low birefringence (~.004); apatite or idocrase seems possible given lithological context. These grains ...

    Raven Mueller - 2015-09-05

  2. Eureka

    ... of a very low birefringent, uniaxial negative mineral, apatite seems a likely candidate but others such as vesuvianite are ...

    Ed FitzGerald - 2015-09-05