Wisconsin Geological Society Contacts

President: John Hammetter (414) 444-5973
VP/Program: Pierre Couture (414) 475-0186
Show Chairman: Paul Schmidt (414) 771-8668
Business Liason: Margaret Pearson (414) 464-0781
Bulletin: The Trilobite   Editor: Paul Schmidt   pvs@wi.rr.com

Like us on Facebook

Membership includes the following:
Monthly Meetings- Field Trips- Monthly Newsletter- Further exploration into fields such as Lapidary, Fossils, and Minerals.  Share fellowship in a common interest.
Membership is: Single $15.00 per year - Family $20.00 per year

Mohs Scale

  • In 1812 the Mohs scale of mineral hardness was devised by the German mineralogist Frederich Mohs (1773-1839), who selected the ten minerals because they were common or readily available.
  • 1-Talc Talcum powder.
    2-Gypsum Plaster of paris. Gypsum is formed when seawater evaporates from the Earth’s surface.
    3-Calcite Limestone and most shells contain calcite.
    4-Fluorite Fluorine in fluorite prevents tooth decay.
    5-Apatite When you are hungry you have a big "appetite".
    6-Orthoclase Orthoclase is a feldspar, and in German, "feld" means "field".
    8-Topaz emerald and aquamarine are varieties of beryl with a hardness of 8.
    9-Corundum Sapphire and ruby are varieties of corundum. Twice as hard as topaz.
    10-Diamond Used in jewelry and cutting tools. Four times as hard as corundum.