Chert (and associated river cobbles)
Silicon dioxide (SiO2)
sedimentary
Category
Industrial Byproduct
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Basalt (tumbled/river-worn)
Mafic volcanic rock (primarily plagioclase feldspar and pyroxene)
igneous
Anthracite Coal
Anthracite (Carbon-rich metamorphic rock)
metamorphic
Quartzite
Metamorphosed Sandstone (SiO2)
metamorphic
Basalt
Basalt
igneous
Gold Ore in Quartz
Auriferous Quartz (SiO2 with Au inclusions)
mineral
Milky Quartz in Matrix
Silicon Dioxide (SiO2)
mineral
Gold Nugget
Native Gold (Au)
mineral
Cubic Zirconia
Zirconium Dioxide (ZrO2)
mineral
Fuchsite
K(Al,Cr)2(AlSi3O10)(OH)2 (Chromium-rich Muscovite)
mineral
Quartzite River Pebbles
Quartzite (primarily SiO2)
Metamorphic
Granodiorite
Granodiorite
igneous
Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Beryl (Emerald Variety)
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Aragonite / Calcite Geode
Calcium Carbonate (CaCO3)
mineral
Quartzite
Metamorphosed Sandstone (SiO2)
metamorphic
Blue Sapphire
Corundum (Al2O3)
mineral
Peridotite (with Olivine)
Peridotite (rich in Olivine, (Mg,Fe)2SiO4)
igneous
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Yellow Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
White Agate (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Yooperlite
Fluorescent Sodalite-bearing Syenite
igneous
Blue Sapphire
Corundum (Al2O3 - Aluminum Oxide)
mineral
Diamond (Faceted Colorless)
Diamond (Pure Carbon, C)
mineral
Andesite Porphyry (Geological Drill Core)
Andesite Porphyry
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Diamond
Carbon (C)
mineral
Peridot (Gem-quality Olivine)
Magnesium Iron Silicate ((Mg, Fe)2SiO4)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Calcite Geode
Calcium Carbonate (CaCO3)
mineral
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Anthracite Coal
Anthracite coal (High-rank coal)
sedimentary
Yellow Agate (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Agate
Cryptocrystalline Silicon Dioxide (SiO2)
mineral
Sapphire
Corundum (Al2O3)
mineral