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    The letters stand for the GRADES of crystal. There's B, A, AA, AAA, Gem Grade, and it goes more in depth but we are keeping it simple and basic here. B is low grade and working up from there. A is lower grade than AA. AAA grade is higher than AA grade.
    meadowscrystals.com/blogs/news/why-crystal-grad…

    Here is a general guideline I follow for crystal grades:

    • Extra-Grade are those absolutely breath-taking, almost gem quality crystals. These crystals have great clarity and they have a beautiful, vibrant colour. ...
    sgcrystalhealing.com/are-higher-grade-crystals-mo…

    The Seven Crystal Systems

    • Triclinic System: It is the most unsymmetrical crystal system. ...
    • Monoclinic System: It comprises three axes where two are at right angles to each other, and the third axis is inclined. ...
    byjus.com/chemistry/crystal-structure/
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