[Jewelry making - Article 00204] - Re: [Orchid] Africa Blue

[MillsGem]

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Dear Julia,

    Specifically, quartz that is included with dumortierite is a rock,
    not a mineral .The same might be said for "silicated" chrysocolla.
    The quartz has not been colored by the other minerals. The quartz
    within the rock is quite colorless. What you are seeing is color
    domination by the included minerals. The same thing goes for Oregon
    sunstone. The host feldspar is a drab, somewhat transparent mineral
    but the profuse copper micro crystals within dominate the color. (
    The man made goldstone is another example of the same phenomenon.)
    Another example would be aventurine.....the list goes on; we are
    talking about rocks that are comprised of two or more minerals.   

Ron Mills, Mills Gem Co. Los Osos, Ca.

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