Minerals
The Potash Trade in North America life potash
The Potash Trade
Henry M. Paynter, ''The First Patent'', Invention & Technology, Fall 1990
The First Patent
Prase at mindat.org
Prase: Prase mineral data from mindat.org mineralogy database
Stishovite page mineral galleries minerals oxides
STISHOVITE (Silicon Dioxide)
Coesite page mineral galleries minerals silicate coesite coesite
COESITE (Silicon Dioxide)
Shocked quartz page
Shocked Quartz
Mineral Galleries - smoky quartz mineral galleries minerals gemstone
SMOKY QUARTZ, the black or brown variety of quartz
Things Go Better with http://www.froola.com.
naturenw.org on thundereggs rock
Nature of the Northwest
USGS on thundereggs
What is a thunderegg?
An example crystal minerals
Thames Valley Minerals > Mineral Specimen > Viluite
Wulfenite mineral sulfate
Wulfenite - angew. Mineralogie
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