In his carefully written text, geologist Paul Garvin has combined scientific facts about minerals with an appreciation of their history and beauty to produce a

From the spiky teeth of a geode containing sparkling quartz crystals, the rich browns and golds of smoky quartz and goethite needles on calcite, and the coral-l

State chapters from this publication are designed to provide statistical data and information for mineral commodities on a State-by-State basis. Additional chap

Iowa's rock record is the product of more than three billion years of geological processes. The state endured multiple episodes of continental glaciation during