Kinoite (0.2 mm) protruding from calcite matrix. Laurium mine dump, Calumet, Michigan. John A. Jaszczak photo.

Very fine specimen of calumetite from Ahmeek #2 mine, Keweenaw County, Michigan. Collected by Tom Rosemeyer and Jeff Nuttal. Donated by Jeff Nuttal. John A. Jaszczak photo.

Cuprite (1 mm) with protruding and associtaed olivenite in "mohawkite" matrix. Lake Superior Copper District, Keweenaw Peninsula, Michigan. John A. Jaszczak photo.

Pumpelleyite, variety "greenstone" State Gemstone of Michigan (cab: 1.5x1.9cm; rough 2x4cm; tumbled stone 2x3cm) Isle Royale, Lake Superior, Michigan. George W. Robinson photo.

Extremely large powellite crystal (4.5 cm across). Tamarack mine, #3 shaft, Houghton County, Michigan. Debra Wilson photo.

Analcime (1.5 cm) with copper inclusions. L. L. Hubbard Collection #1021. Cliff Mine, Keweenaw County, Michigan. John A. Jaszczak photo.

Apophyllite (1-cm xtl). J. T. Reeder collection #365. Cliff Mine, Keweenaw County, Michigan. John A. Jaszczak photo.