Browsing William S. Cordua, Ph.D by Subject "Minerals"
Now showing items 1-20 of 77
-
Agates - Rich in fiber!
(St. Croix Rockhounds, Stillwater, MN, 1996) -
Are carbonado diamonds out of this world?
(St. Croix Rockhounds, Stillwater, MN, 2007) -
Arsenic and old sandstone
(St. Croix Rockhounds, Stillwater, MN, 1999) -
Bauxite and greenhouse earth
(St. Croix Rockhounds, Stillwater, MN, 2007) -
Blue, blue, my quartz is blue
(St. Croix Rockhounds, Stillwater, MN, 1995) -
Cave spar
(St. Croix Rockhounds, Stillwater, MN, 2002) -
Collecting trip to the Vulcan Materials Company Quarry, Racine, Wisconsin
(St. Croix Rockhounds, Stillwater, MN, 1997) -
Cosmetic minerals of Ancient Egypt
(St. Croix Rockhounds, Stillwater, MN, 2000) -
Crystal diving for fluid inclusions
(St. Croix Rockhounds, Stillwater, MN, 1989) -
Deadly erionite
(St. Croix Rockhounds, Stillwater, MN, 1995) -
Dense as a rock
(St. Croix Rockhounds, Stillwater, MN, 2001) -
Determining the source of gem emeralds
(St. Croix Rockhounds, Stillwater, MN, 2001) -
Diamond-wrongs
(St. Croix Rockhounds, Stillwater, MN, 2008) -
Disorderly opal
(St. Croix Rockhounds, Stillwater, MN, 2003) -
Drifting Cuyuna tourmaline
(St. Croix Rockhounds, Stillwater, MN, 1999) -
Epidote
(St. Croix Rockhounds, Stillwater, MN, 1994) -
False forms
(St. Croix Rockhounds, Stillwater, MN, 1989) -
Feeling minerals
(St. Croix Rockhounds, Stillwater, MN, 2000) -
Field spar
(St. Croix Rockhounds, Stillwater, MN, 2004) -
Fire of opal
(St. Croix Rockhounds, Stillwater, MN, 1993)