Geoprime's Teacher version of the Mineral Hardness Test kit.   E-mail:  xlmine@geoprime.com or call 760-949-3077.

 Large numbered samples of Mohs 9 hardness scale minerals.  Teachers love these!

Glass plate, streak plate, and nail also included.  Booklet.  MHTK-TCHR. $24.95.

 

  Booklet on hardness testing included in Teacher version.