rockhound metamorphic nonmetallic sedimentary fossil birthstone mine safety basalt quartz amorphous geode weathering crystalline hardness luster igneous magnetic obsidian pumice Mohs Scale lava talc geology formation granite feldspar mica petrified wood sand magma stone agate amber gold rhyolite diamond Keokuk geode calcite mineral mica sand rock candy Created by Annette Lamb and Larry Johnson , 1/99 Updated, 1/01.
(1/99; Updated; ) (feldspar mica; petrified; wood sand magma stone agate amber gold rhyolite diamond) (metamorphic nonmetallic sedimentary fossil birthstone mine safety basalt quartz amorphous geode weathering crystalline hardness luster igneous magnetic obsidian pumice Mohs Scale lava talc geology formation granite feldspar mica petrified wood sand magma stone agate amber gold rhyolite diamond Keokuk geode calcite mineral mica sand rock candy; Created; by Annette Lamb and Larry Johnson)
1/99 feldspar mica metamorphic nonmetallic sedimentary fossil birthstone mine safety basalt quartz amorphous geode weathering crystalline hardness luster igneous magnetic obsidian pumice Mohs Scale lava talc geology formation granite feldspar mica petrified wood sand magma stone agate amber gold rhyolite diamond Keokuk geode calcite mineral mica sand rock candy
Updated petrified Created
wood sand magma stone agate amber gold rhyolite diamond
by Annette Lamb and Larry Johnson