White Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
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Amethyst (Chevron or Banded Amethyst)
Silicon Dioxide (SiO2) with iron impurities
mineral
Carnelian
Carnelian (SiO2, Silicon Dioxide with Iron Oxide impurities)
mineral
Sandstone (likely Quartzose Sandstone with mineral staining)
Arenite (composed mainly of SiO2)
sedimentary
Quartzite and Sandstone Pebbles
Silicon dioxide (SiO2)
metamorphic and sedimentary
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Sandstone Concretion
Septarian or Carbonate-cemented Sandstone Concretion
sedimentary
Ironstone Concretion
Limonitic/Hematitic Concretion
sedimentary
Granite Pebble
Phaneritic Felsic Igneous Rock
igneous
Gabbro (River Cobble)
Gabbro (mafic intrusive rock)
igneous
Serpentinite
Serpentinite (composed primarily of Serpentine-group minerals: (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)
metamorphic
Shale with Vein Infillings
Shale (a fine-grained clastic sedimentary rock). The veins could be Calcite (CaCO3), Quartz (SiO2), or other minerals.
Sedimentary Rock
Chert (Polished/Tumbled)
Silicon Dioxide (SiO2)
sedimentary
Dalmatian Jasper
Aplite with Arfvedsonite inclusions
igneous
Pyrite (on host rock)
Iron Sulfide (FeS2)
mineral
Sandstone (Quartz-rich)
Arenite (composed primarily of SiO2)
sedimentary
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
metamorphic
Olivine Basalt
Mafic Volcanic Rock (rich in (Mg, Fe)2SiO4)
igneous
Vesicular Basalt
Vesicular Basalt (rich in silicate minerals mostly Plagioclase and Pyroxene)
igneous
Dyed Agate Geode Slice
Silicon Dioxide (SiO2)
mineral
Granite Gneiss
Gneiss (quartz-feldspar dominated)
metamorphic
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Milky Quartz with inclusions
Quartz (Silicon Dioxide, SiO2)
mineral
Granodiorite
Granodiorite (calc-alkaline phaneritic igneous rock)
igneous
Gneiss
Gneiss
metamorphic
Porphyritic Basalt (with Olivine or Quartz phenocryst)
Porphyritic Basalt (Mafic Extrusive)
igneous
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Chert (Common Opal or Flint variant)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone with Liesegang Rings
Clastic Sedimentary Rock with Iron Oxide Precipitates (SiO2 + Fe2O3)
sedimentary
Chevron Amethyst
Silicon Dioxide (SiO2)
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Quartz Geode (Druzy Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Shale (with Iron Oxide staining)
Fissile Mudstone (primarily Quartz and Clay minerals)
sedimentary
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Geode (Unbroken)
Silicon Dioxide (SiO2)
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Sandstone
Arenite (Sedimentary rock comprising sand-sized grains)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Milky Quartz Pebble
Quartz (Silicon Dioxide - SiO2)
mineral
Quartz
Quartz (Silicon Dioxide, SiO2)
mineral