gems, ornamental gems, jade, nephrite, jadeite, hematite, malachite, amber, agate, amazonite, rhodonite, marble, obsidian, jet, rose quartz, petrified wood

Sinkankas: The “Geology of Ornamental Stone Deposits,” on a world-wide basis, but most space devoted to occurrences within the USSR. Similar to above in respect to opening remarks; gemstones include lapis lazuli, jadeite, nephrite, malachite, amber, amazonite, other feldspars, rhodonite, quartz varieties, hematite, marble, obsidian, jet, rose quartz, petrified wood, and fibrous quartz varieties. The color plates, fair in quality, depict the gemstones in rough & cut forms.