River Cobble (likely Serpentinite or Greenstone)
Serpentinite / Greenschist facies rock
metamorphic
Category
Industrial Byproduct
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Diamond (appearing as a jewelry centerpiece)
Diamond (Formula: C)
mineral
Diamond
Carbon (C)
mineral
Garnet-bearing Quartzite
Metamorphic rock containing Almandine Garnet (Fe3Al2(SiO4)3) and Quartz (SiO2)
metamorphic
Serpentinite
Serpentinite (composed largely of Serpentine group minerals like Antigorite, Lizardite, and Chrysotile: Mg3Si2O5(OH)4)
metamorphic
Natural Diamond (Faceted)
Diamond (pure carbon crystal, C)
mineral
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Chert (or Agate/Quartzite)
Microcrystalline Quartz (SiO2)
sedimentary
Gold
Gold (Native Element); Au
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst (Rose-tinted variation)
Silicon Dioxide (SiO2) with trace iron impurities
mineral
Epidote in Basalt
Epidotized Basalt (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH) in Mafic Igneous Host)
igneous
Diamond Druzy (Crystalline Diamond)
Carbon (C)
mineral
Granitic Pegmatite with Tourmaline/Chlorite
Pegmatite
Igneous
Peridotite (with Olivine)
Peridotite (dominantly (Mg, Fe)2SiO4)
igneous
Magnetite / Hematite mix (Iron Ore)
Fe3O4 (Magnetite) / Fe2O3 (Hematite)
mineral
Peridotite
Peridotite (varieties include Dunite, Lherzolite, Harzburgite)
igneous
Diamond (Cut Gemstone)
Carbon (C)
mineral
Garnet (Almandine/Pyrope variety)
Silicate mineral group; typically Fe3Al2(SiO4)3 (Almandine) or Mg3Al2(SiO4)3 (Pyrope)
mineral
Quartz Cobble
Quartz (Silicon Dioxide, SiO2)
Mineral
Basalt
Basalt (Mafic volcanic rock)
igneous
Grey Agate
Silicon Dioxide (SiO2) - variety: Agate/Chalcedony
mineral
Diamond (in jewelry)
Carbon (C)
mineral
Agate
Agate (Silicon Dioxide, SiO2)
mineral
Cubic Zirconia (CZ) Jewelry
Zirconium dioxide (ZrO2)
mineral (synthetic)
Quartzite
Quartzite (primarily SiO2)
metamorphic
Almandine Garnet
Iron aluminum silicate (Fe3Al2(SiO4)3)
mineral
Basalt
Basalt (composition of Plagioclase feldspar and Pyroxene)
igneous
Corundum (Sapphire and Ruby)
Aluminum Oxide (Al2O3)
mineral
Rough Star Sapphire (Corundum)
Al2O3 (Aluminum Oxide)
mineral
Cubic Zirconia (Diamond Simulant)
Zirconium Dioxide (ZrO2)
mineral
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Granitic Pegmatite
Pegmatitic Granite
igneous
Pegmatite with Quartz and Muscovite Mica
Granitic Pegmatite (KAl2(AlSi3O10)(OH)2 + SiO2)
igneous
Yellow Quartzite
Quartzite (primarily Silicon Dioxide - SiO2)
metamorphic
Quartzite (Rounded Pebble)
Quartzite (predominantly SiO2)
metamorphic
Basalt
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Native Copper
Native Copper (Cu)
mineral
Sandstone (Yellow/Tan Sandstone)
Arenite (primarily Quartz, SiO2)
sedimentary
Quartz (Iron-stained or Ferruginous Quartz)
Silicon Dioxide (SiO2)
mineral
Garnet-Mica Schist
Schist (variety with Almandine Garnet, Fe3Al2(SiO4)3)
metamorphic