Flint / Chert (Hag Stone)
Silicon Dioxide (SiO2)
sedimentary
Category
Man Made Object (Ring)
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Jasper
Microcrystalline Quartz (SiO2)
mineral
Agate
Silicon dioxide (Chalcedony), SiO2
gemstone
Petrified Wood
Silicified wood (permineralized wood)
fossil
Carnelian Agate
Silicon Dioxide (Chalcedony variety)
mineral
Carnelian
Carnelian (Chert/Chalcedony variety of Quartz, SiO2)
mineral
Banded Sandstone
Quartz Arenite (with iron oxide banding)
sedimentary
Carnelian (Tumbled Chalcedony)
Silicon Dioxide (SiO2)
gemstone
Carnelian Agate
Silicon Dioxide (SiO2)
gemstone
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement of Cellulose)
fossil
Carnelian and Mixed Agates
Cryptocrystalline Quartz (SiO2 with Iron Oxide impurities)
mineral
Sandstone with Iron Oxide
Arenite (SiO2 with Fe2O3 inclusions)
sedimentary
Carnelian Agate
Carnelian (Silicon Dioxide - SiO2 with Fe impurities)
mineral
Carnelian (Chalcedony)
Cryptocrystalline Quartz (SiO2) with Iron Oxide impurities
mineral
Tumbled Carnelian and Quartz Mix
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Sandstone with Ironstone Banding
Clastic Sandstone (composed of Quartz with Hematite/Limonite bonding)
sedimentary
Petrified Wood
Silicified wood (primarily Quartz/Chalcedony, SiO2)
mineral
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 oxides)
sedimentary
Flint
Silicon Dioxide (SiO2) - Microcrystalline Quartz / Chert
sedimentary
Amethyst (with Pyrite and other minerals)
Silicon Dioxide (SiO2)
mineral
Diorite
Intermediate plutonic igneous rock
igneous
Chert / Green Jasper
Silicon Dioxide (SiO2)
sedimentary
Gold
Native Gold (Au)
mineral
Dyed Quartz (imitating Emerald/Green Quartz)
Silicon Dioxide (SiO2) with artificial pigment
mineral
Diorite (River Pebble)
Intermediate Phaneritic Igneous Rock
igneous
Smoky Quartz
Silicon Dioxide (SiO2) with aluminum impurities
mineral
White Marble
Recrystallized Calcite Rock (CaCO3)
metamorphic
Dolerite (Diabase)
Dolerite / Diabase
igneous
Sandstone
Arenite (SiO2 principal)
sedimentary
Green Slag Glass
Amorphous Silica / Glassy Blast Furnace Slag
Mineraloid (Industrial byproduct)
Carnelian (Carnelian Agate)
Cryptocrystalline Quartz (SiO2 with Hematite impurities)
mineral
Chert
Microcrystalline quartz (SiO2)
sedimentary
Coral Rock (Coquina)
Biogenic Limestone (Calcium Carbonate - CaCO3)
sedimentary
Sandstone with Liesegang Rings
Clastic sedimentary rock (Sandstone with iron oxide rhythmic precipitation)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
mineral
Shiva Lingam (Sandstone Pebble)
Ferruginous Sandstone (SiO2 with Fe-oxides)
sedimentary
Sandstone
Arenite (Sedimentary Rock)
sedimentary
Agate (specifically crazy lace agate / orbicular agate node)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Wonderstone (Sandstone)
Silicified Quartz Sandstone with Iron Oxide staining
sedimentary
Banded Sandstone
Arenite with Liesegang banding (primarily SiO2 with FeO(OH) impurities)
sedimentary
Yellow Jade (Nephrite or Jadeite)
Nephrite: Ca2(Mg, Fe)5Si8O22(OH)2; Jadeite: NaAlSi2O6
metamorphic
Blue-beaded gemstone jewelry, likely lapis lazuli or dyed blue agate
Uncertain from the image; possible lazurite-bearing lapis lazuli (Na₃Ca(Si₃Al₃)O₁₂S) or blue chalcedony (SiO₂)
gemstone