Ironstone Concretion (Moqui Marble variety)

Ferruginous Sandstone Concretion

sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

mineral

Red Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz

sedimentary

Quartzite pebble

Quartzite (primarily SiO2)

metamorphic

Sandstone (likely Arkosic or Lithic Sandstone)

Clastic Sedimentary Rock (SiO2 with assorted minerals)

sedimentary

Obsidian

Volcanic glass (SiO2 - Silicon Dioxide)

Igneous

Moonstone

Orthoclase feldspar ((K,Na)AlSi3O8)

mineral

Moqui Marble

Ironstone Concretion (Goethite/Hematite shell with Sandstone core)

sedimentary

Kambaba Jasper

Stromatolite (Fossilized Algae)

sedimentary

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

mineral

Rose Quartz

Silicon Dioxide (SiO2)

mineral

Tiger's Eye

Silicon Dioxide (SiO2) with iron oxide inclusions

Mineral

Peach Moonstone

Orthoclase Feldspar ((K,Na)AlSi3O8)

mineral

Tiger's Eye

SiO2 (Pseudomorph of Quartz after Crocidolite)

metamorphic

Green Aventurine

Silicon dioxide (SiO2) with Fuchsite inclusions

metamorphic

Lepidolite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

mineral

Concrete Paver (Artificial Cementitious Rock)

Hydrated Portland Cement Aggregate

Sedimentary (Synthetic)

Sandstone (River Rock)

Arenite (composed primarily of SiO2)

sedimentary

Sandstone (with Manganese staining)

Arenite (composed primarily of SiO2)

sedimentary

Serpentine

Serpentinite (group of minerals: (Mg,Fe,Ni,Al)3Si2O5(OH)4)

metamorphic

Schist (specifically Mica Schist)

Mica Schist (primarily composed of Muscovite KAl2(AlSi3O10)(OH)2 and Biotite)

metamorphic

Quartz with Limonite Staining

Silicon Dioxide (SiO2) with Hydrated Iron Oxide (FeO(OH)·nH2O)

Mineral

Greenschist (Greenstone)

Chlorite Schist / Greenschist Facies Rock

metamorphic

Sandstone (Ferruginous)

Sandstone (mainly SiO2 with Fe2O3 staining)

sedimentary

Lapis Lazuli

Lapis Lazuli (Primary mineral: Lazurite, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

metamorphic

Amethyst

Crystalline Silicon Dioxide with Iron impurities (SiO2)

mineral

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

sedimentary

Banded Sandstone (Zebra Stone)

Arenite with Iron Oxide Banding (Liesegang rings)

sedimentary

Pink Granite

Phaneritic Felsic Igneous Rock (Granite)

igneous

Red Sandstone (Hematitic)

Clastic sedimentary rock (SiO2 with Fe2O3 inclusions)

sedimentary

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

sedimentary

Quartzite Pebble (River Rock)

Quartzite (SiO2)

metamorphic

Siltstone

Siltstone (composed of clastic quartz and feldspar)

sedimentary

Zebra Jasper (Zebra Stone)

Silicon Dioxide (SiO2) with iron oxide and manganese inclusions

sedimentary

Milky Quartz

Silicon Dioxide (SiO2)

mineral

Rose Quartz

Quartz (Silicon Dioxide, SiO2) with trace amounts of titanium, iron, or manganese

mineral

Quartzite

Quartzite (primarily SiO2)

metamorphic

Dalmatian Stone (Dalmatian Jasper)

Peralkaline Quartz-Feldspar Porphyry with Arfvedsonite

igneous

Hematite (Tumbled)

Iron(III) oxide (Fe2O3)

mineral

Granite

Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)

igneous

Yellow Calcite

Calcite (Calcium Carbonate, CaCO3)

mineral

Granite

Plutonic Igneous Rock (composed typically of SiO2, Al2O3, K2O, Na2O, CaO)

igneous