Minnesota Mineral Specimens
OKD-099 Groutite and Quartz Robert Mine, Caynua Range, MN. Ex. Dr. Steve
Chamberlain Collection. Very rare mineral from its classic location. Lots of
voids in this large chunk with tiny crystals throughout. I say, “Tiny”
but these are huge for the species. Crystals are somewhat crude in form while
others are sharpe. Crystals to half a cm in length! Bright silver colored to
flat gray in color. Excellent example of this rare material. 10 x 9 x 6 cm
overall. 200$
OKD-100 Groutite and Quartz Robert Mine, Caynua Range, MN. Ex. Dr. Steve
Chamberlain Collection. Very rare mineral from its classic location. Seam
material in massive for with plenty of tiny crystal to .3 cm each. Bright
silver colored to flat gray in color. Excellent example of this rare material.
5 x 4.5 x 3.5 cm overall. 120$
OKB-250 Thompsonite Grand Marais,
Minnesota. This nice thompsonite nodule is from a site south
of Grand Marais in a basalt flow. Main nodule diameter is 1.4 cm.
Internal radiating crystals can be exposed by cutting or polishing the nodule.
These are as they are harvested. Overall size is 4.5 x 3 x 2.5 cm.
25$
OKB-251 Thompsonite Grand Marais,
Minnesota. This nice thompsonite nodule is from a site south
of Grand Marais in a basalt flow. Main nodule diameter is 1 cm with other
nodules present. Internal radiating crystals can be exposed by cutting or
polishing the nodule. These are as they are harvested. Overall size
is 8 x 3 x 4 cm. 18$
OKB-252 Thompsonite Grand Marais,
Minnesota. This nice thompsonite nodule is from a site south
of Grand Marais in a basalt flow. Main nodule diameter is 1.2 cm.
Internal radiating crystals can be exposed by cutting or polishing the nodule.
Small chip on this specimen shows these crystals. Overall size is
3.5 x 3 x 2 cm. 20$
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