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  • The Willet Willis collection of micromount minerals is housed in wooden cases that contain hundreds of tiny boxes. (© DMNS/Rick Wicker)

    The Willet Willis collection of micromount minerals is housed in wooden cases that contain hundreds of tiny boxes. (© DMNS/Rick Wicker)

  • The collection of acclaimed mineralogist Willet Willis includes his 19th-century brass microscope. (© DMNS/Rick Wicker)

    The collection of acclaimed mineralogist Willet Willis includes his 19th-century brass microscope. (© DMNS/Rick Wicker)

  • The Willet Willis collection includes his stereophotographs, which he used to teach his students about classic mineral forms. (© DMNS/Rick Wicker)

    The Willet Willis collection includes his stereophotographs, which he used to teach his students about classic mineral forms. (© DMNS/Rick Wicker)

  • The headstone of Lazard Cahn, an internationally renowned mineral morphologist and Willet Willis's mentor, is shaped like the mineral named for Cahn-the twinned mineral cahnite. (© Jennifer Root)

    The headstone of Lazard Cahn, an internationally renowned mineral morphologist and Willet Willis's mentor, is shaped like the mineral named for Cahn--the twinned mineral cahnite. (© Jennifer Root)

  • The Willis Willet collection includes 161 porcelain models depicting each of the major crystal systems, created by John Joseph Griffin of Scotland in 1841. These were used to teach geology to early Colorado College students. (© DMNS/Rick Wicker)

    The Willis Willet collection includes 161 porcelain models depicting each of the major crystal systems, created by John Joseph Griffin of Scotland in 1841. These were used to teach geology to early Colorado College students. (© DMNS/Rick Wicker)

  • Willet Willis (left) with his wife and son, date unknown. (© DMNS)

    Willet Willis (left) with his wife and son, date unknown. (© DMNS)

  • Brochantite from the Willis micromount collection. (© DMNS/Richard J. Cook)

    Brochantite from the Willis micromount collection. (© DMNS/Richard J. Cook)

  • Vanadinite on deseloizite from the Willis micromount collection. (© DMNS/Richard J. Cook)

    Vanadinite on deseloizite from the Willis micromount collection. (© DMNS/Richard J. Cook)

  • Cyanotrichite from the Willis micromount collection. (© DMNS/Richard J. Cook)

    Cyanotrichite from the Willis micromount collection. (© DMNS/Richard J. Cook)

  • Crystalline gold from Transylvania, illustrating highly unusual cube-shaped crystals. (© DMNS/Marcus Lieberman)

    Crystalline gold from Transylvania, illustrating highly unusual cube-shaped crystals. (© DMNS/Marcus Lieberman)

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