gem

  • Meetings List

    The Pinal County Gem And Mineral Society meets every 3rd Wednesday at the Pinal Geology and Mineral Museum in the Artisian Village, Coolidge, AZ, September through May!

    Everyone is welcome!!

    Adults, families, children are all invited. Begining hobbyists and seasoned professionals and everyone in between should find something of interest.

    Membership is not required to attend meetings!

    Speakers, door prizes, silent auction, anouncements, refreshments are served. 

    Doors open at 6:30 pm, meeting starts 7:00pm.

    Due to health concerns, the March, April, and May 2020 meetings are canceled. Our next scheduled meeting is September 16.  Check back in August for any updates to that schedule.

    Location

    2020 Meeting Dates:

    • January 15: Richard Sichling will speak on Arizona caves, and discuss the possibility of a cave field trip. The upcoming major shows in Tucson will also be discussed.
    • February19: “Can you find a meteorite?” with speaker Laurence Garvie, Curator for the Center for Meteorite Studies and Research Professor in the School of Earth and Space Exploration at Arizona  State University.
    • March 18: CANCELED
    • April 15: CANCELED
    • May 20: CANCELED
    • June: no meeting
    • July: no meeting
    • August: no meeting
    • September 16: TBA
    • October 21: TBA
    • November 18: TBA
    • December 16: TBA
  • Turquoise of Tonapah, Nevada

    A gift of the Otteson family of Tonapah, Nevada, this group of Turquoise specimens along with some Dolomite are from their family claims near Tonapah, Nye County, Nevada.

    Turquoise has been prized for thousands of years by cultures around the world. It was one of the first gemstones to be mined. It has been mined and used in Egypt for at least 5,000 years, and in Iran for over 2,000 years.

    Turquoise is the State Gem of Arizona.

    Mineral Properties:

    • Formula: CuAl₆(PO₄)₄(OH)₈·4H₂O
    • Color: green, blue, “turquoise”
    • Luster: waxy
    • Crystal System: Triclinic
    • Hardness: 5-6

     

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