n Small production included under "miscellaneous gems."
Includes apatite calamine, chlorastrolite, crocidolite, datolite,
fossil coral, Iceland spar, kyanite, lapis lazuli, obsidian, peridot,
phenacite, rutile, smithsonite, spodumene (kunzite), staurolite,
thomsonite, titanite, and zircon.
Includes chlorastrolite, datolite, epidote, fossil coral, hematite,
kyanite, lazulite, rhodonite, rutile, seiiohte, serpentine, spodumene,
staurolite, and vesuvianite.
andalusite, chlorastrolite, datolite, epidote, feldspar, fossil coral,
hematite, Iceland spar, lapis lazuli, obsidian, peridotr phenacite, pynte, rhodonite, rutile, sepiolite, smithsonite, spodumene, staurolite, thomsonite, willemite, and ziosite.
Includes andalusite, calamine, chlorastrolite, datolite, epidote,
feldspar, fluorite, Iceland spar, lapis lazuli, mariposite, meerschaum,
obsidian, phenacite, pyrite, satin spar (gypsum), staurolite,
thomsonite, willemite, and zoisite.
value given in the table largely represents the value of the rough
material; the value of the cut and polished gems is several times
greater. The completeness and accuracy of the statistics of
The tables giving statistics of the value of the gems and precious
stones produced in the United States in 1918 were compiled by Miss
Blanche H. Stoddard, of the United States Geological Survey.