University of Korth Dakota 



110 — Chalcedony, \\\ chain-like masses, and shading into 

 Onyx. 



Black Hills, Dakota. 



1 1 1 — Chalcedony. 



Black Hills, Dakota. 



1 12 — Agate. 



Black Ililis, Dakota. 



118 — Banded Agate. 



Black Hills, Dakota, 



1 14 — Jaspery Quartz. 



Black Hills, Dakota. 



115-119 — Spodumene (Lithia, Silica and Alumina), large crystals. 



Harney Peak region, Black Hills, Dakota. 



1 20— Spodumene, carrying Vanadinite. 



Harney Peak region, Black Hills, Dakota. 



121 122 — Beryl Crystals. Large hexagonal prisms, each face 

 four inches wide and two feet long. 



Harney Peak region. Black Hills, Dakota. 



123— Beryl Crystal. Green. 



Harney Peak region. Black Hills, Dakota. 



124— Granite. 



Black Hills, Dakota. 

 125 126— Graphic Granite. 



Black Hills, Dakota 



127— Porphyry. 



Deadvvood, Black Hills, Dakota. 



128— Dendrite. 



Lead City, Black Hills, Dakota. 



129— Dendrite on Rhyolite. 



Lead (Mty, lilack Hills, Dakota. 



130-132— Conglomerate. 



Lead City, Black Hills, Dakota. 



133 — Breccia. L'nusually fine. 



Hot Springs, Black Hills, Dakota. 



