Banded Chert
Silicon Dioxide (SiO2) with impurities
sedimentary
Category
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Dyed Agate
Silicon Dioxide (SiO2) with artificial colorants
mineral
Aventurine (Green Quartz)
Silicon Dioxide (SiO2) with Fuchsite inclusions
mineral
Tumbled orange chalcedony (likely carnelian)
Microcrystalline quartz, SiO₂; iron-bearing variety commonly termed carnelian
mineral
Diamond (Heart Cut)
Carbon (C)
gemstone
Silty Shale
Silty Shale (Fissile Sedimentary Rock)
sedimentary
River Pebble (Sandstone / Quartzite)
Sedimentary rock (Quartz arenite / Quartzite pebble)
sedimentary
Tumbled jasper or chert
Microcrystalline quartz (SiO₂), possibly iron-bearing jasper
mineral
Serpentine
Antigorite/Chrysotile group (Mg3Si2O5(OH)4)
metamorphic
Granite
Intrusive Igneous Rock (Granitic)
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Shale
Fissile mudstone (primarily clay minerals and silt-sized quartz)
sedimentary
Smoky Quartz with Siderite
Silicon Dioxide (SiO2) with Iron(II) Carbonate (FeCO3)
mineral
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Sandstone
Arenite (CaCO3/SiO2 cemented quartz)
sedimentary
Quartzite Pebble
Quartzite (SiO2-rich metamorphic rock)
metamorphic
Agate (specifically Chalcedony nodule)
Silicon Dioxide (SiO2)
mineral
Shale
Shale (clay-sized silicate minerals)
sedimentary
Ironstone Concretion / Goethite-Hematite Nodule
Goethite/Hematite (α-FeO(OH) / Fe2O3)
sedimentary
Yellow Quartz / Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Painted Garden Rock (likely Granite or Limestone base)
Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3) based substrate with Acrylic/Enamel pigments
igneous or sedimentary (anthropogenic modification)
Blue Banded Agate (Dyed)
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Yellow Quartz (Citrine Quartz variety / Ferruginous Quartz)
Silicon Dioxide (SiO2) with iron inclusions
mineral
Tumbled granite
Granite, chiefly quartz, feldspar, and mica
igneous
Sandstone (Ferruginous)
Ferruginous Sandstone (SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Tumbled jasper or brecciated jasper
Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and dark mineral inclusions
mineral
Pink Granite
Granite (composed primarily of Quartz, K-Feldspar, and Plagioclase)
igneous
Dyed Agate (Tumbled)
Silicon Dioxide (SiO2) - stained microcrystalline quartz
sedimentary
Red Sandstone
Arenite (primarily Quartz and Iron Oxide)
sedimentary
Jasper
Silicon dioxide / Chalcedony (SiO2)
Sedimentary
Pumice
Pumice (Vesicular Rhyolite/Andesite)
igneous
Tumbled granite or granitic gneiss
Granite, typically quartz + feldspar + mica; possibly foliated granitic gneiss
igneous
Pink Granite
Granite (Felsic Plutonic Rock)
igneous
Oolitic Chert
Silicon Dioxide (SiO2) with oolitic texture
sedimentary
Yellow Quartz (Citrine / Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Chalcopyrite (Peacock Ore)
Chalcopyrite (CuFeS2)
mineral
Ferruginous Siltstone
Siltstone with Magnetite/Hematite bands
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Pink Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Granite
Granite (Felsic Intrusive Igneous Rock)
igneous
Sandstone
Arenite
sedimentary