Red Sandstone
Clastic Terrigenous Sedimentary Rock (primarily SiO2 with Fe2O3 coating)
sedimentary
Category
Industrial Byproduct (Anthropogenic Rock Like Material)
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Unakite
Unakite (epidote-bearing altered granite; mainly pink potassium feldspar, green epidote, and quartz)
metamorphic
Petrified Wood
Fossilized plant material (Silicon dioxide - SiO2)
fossil
Chert (specifically Zebra Chert/Flint)
Silicon Dioxide (SiO2)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Red Sandstone
Arenite (predominantly SiO2 with Fe2O3)
sedimentary
Blue Sapphire (likely costume glass imitation)
Corundum (Al2O3) with iron/titanium impurities
mineral
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Chert (Flint)
Chert (SiO2)
sedimentary
Conglomerate
Conglomerate
sedimentary
Pumice
Pumice (volcanic glass with vesicular texture)
igneous
Graywacke
Lithic Sandstone (Graywacke)
sedimentary
Sandstone
Sandstone (Clastic Sedimentary Rock)
Sedimentary Rock
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Graphic Granite
Pegmatitic Granite (Quartz and Microcline K-Feldspar mixture)
igneous
Nephrite Jade
Nephrite
Mineral/Rock
Quartz
Silicon Dioxide (SiO2)
mineral
Greenstone (Greenschist)
Greenschist facies rock (containing chlorite, actinolite, and epidote)
metamorphic
Septarian Nodule Segment (Turtle Stone)
Septarian Concretion (CaCO3 with Siderite or Calcite infill)
sedimentary
Soapstone
Steatite (primarily composed of Talc, Mg₃Si₄O₁₀(OH)₂)
Metamorphic Rock
Gemstone Sand (Mineral Assortment)
Mixed Mineral Concentrates (Commonly including Quartz SiO2, Garnet X3Y2(SiO4)3, and Tourmaline (Na,Ca)(Li,Mg,Al)3(Al,Fe,Mn)6(BO3)3(Si6O18)(OH,F)4)
mineral
Banded Chert
Microcrystalline silicon dioxide (SiO2)
sedimentary
Conglomerate
Conglomerate Rock
sedimentary
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Blue Sapphire Crystal (Rough)
Corundum (Aluminum Oxide, Al2O3)
mineral
Granite
Granite (a felsic intrusive igneous rock)
Igneous Rock
Sandstone
Arenite (primarily SiO2)
sedimentary
River cobble (Greywacke/Sandstone)
Sandstone / Greywacke
sedimentary
Desert Rose (Baryte/Gypsum Rosette)
Baryte (BaSO4) or Gypsum (CaSO4·2H2O)
mineral
Basalt
Basalt (Mafic volcanic rock)
igneous
Fossilized Coral
Rugose coral / Tabulate coral fossil in limestone matrix
fossil
Malachite in Matrix
Copper Carbonate Hydroxide - Cu2CO3(OH)2
mineral
Quartz Pebble (Citrine-colored or Stained Quartz)
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Limestone
Sedimentary rock composed mainly of calcite (CaCO3)
sedimentary
Ironstone Concretion
Siderite / Hematite-bearing Sedimentary Rock
sedimentary
Polished brown jasper (likely brecciated or orbicular jasper)
Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide and other mineral inclusions
gemstone
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Black Tourmaline (Schorl)
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Sandstone
Sandstone (lithified sand)
sedimentary
Silty Shale
Silty Shale (Fissile Sedimentary Rock)
sedimentary