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Web Mineral
"This mineral database contains more than 5,000 pages of mineral data. Data includes stereo diagrams of crystal faces, that are animated to show all sides; and, pronunciation of mineral names (your computer must have speakers). There are 3,968 individual mineral species data descriptions with links."
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Mindat
The largest mineral database and mineralogical reference website on the internet. This site contains worldwide data on minerals, mineral localities and other mineralogical information.
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Utah Geology.Com
"Making utah's geology more accessible", authored by Lance Weaver, UGS. A cornucopia of SW Utah and Colorado Plateau geologic information.
