@article{Law2010,
    author = "Law, J.M. and Hoch, C. and Myunghwan, Whangbo and Kremer, R.K.",
    title = "Description of anhydrous (black) dioptase as a S = 1/2 uniform antiferromagnetic chain system",
    journal = "Zeitschrift fuer Anorganische und Allgemeine Chemie (1950) (DE)",
    year = "2010",
    volume = "636",
    pages = "54-61",
    ASTM_id = "ZAACAB"
}

@article{Breuer1989,
    author = "Breuer, K.H. and Eysel, W. and Mueller, R.",
    title = "Structural and chemical varieties of dioptase, Cu6 (Si6 O18) (H2 O)6 II. Stuctural properties",
    journal = "Zeitschrift fuer Kristallographie (1979-2010)",
    year = "1989",
    volume = "187",
    pages = "15-23",
    ASTM_id = "ZEKRDZ"
}