Sedimentary Or Igneous (Secondary Formation)

Sandstone (with banding)

Arenite (primarily SiO2)

Pyrite

Iron Sulfide (FeS2)

Porous Quartzite

Metamorphosed Quartz-rich Sandstone (SiO2)

Iron Ore / Ironstone Concretion

Mixture of iron oxide/hydroxide minerals, likely some combination of Hematite (Fe2O3), Goethite (α-FeOOH), and Limonite (a general term for hydrated iron oxides of variable composition) or potentially Bauxite (a mixture of aluminum hydroxides, often with iron oxides, (Al(OH)3) and FeO(OH)). The visual characteristics strongly suggest iron-rich material.

Pink Garnet (likely Almandine or Rhodolite)

Garnet Group (Fe3Al2(SiO4)3 to Mg3Al2(SiO4)3)

Quartz (Drusy/Crystalline)

Silicon Dioxide (SiO2)

Citrine

SiO2 (Silicon Dioxide)

Chalcedony (Agate)

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Malachite

Copper carbonate hydroxide Cu2CO3(OH)2

Agate

Silicon dioxide (SiO2)

Rhodonite

Manganese Inosilicate (MnSiO3)

Chert Nodule

Microcrystalline Silica (SiO2)

Dalmatian Stone

Peralkaline Feldsphathic Igneous Rock

Limestone

Calcium Carbonate (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Painted River Rock

Anthropogenic-modified Siliciclastic Sedimentary Rock

Rhodonite

Rhodonite (Manganese Iron Magnesium Calcium Silicate - (Mn,Fe,Mg,Ca)SiO3)

Sandstone (likely Siltstone or Mudstone variety)

Clastic Sedimentary Rock (primarily SiO2 with iron oxides)

Moqui Marble (Concretion)

Iron oxide concretion (Goethite/Hematite and Sandstone)

Chert (Nodule)

Silicon Dioxide (SiO2)

Red Jasper

Silicon dioxide with hematite impurities (SiO2 + Fe2O3)

Blue Kyanite

Kyanite (Al2SiO5)

Jasper

Silicon Dioxide (SiO2) with impurities

Red Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz with iron inclusions

Satin Spar Gypsum

Calcium Sulfate Dihydrate (CaSO4·2H2O)

Specular Hematite

Specularite (Fe2O3)

Jasper (Tiger Eye variety transition)

Silicon Dioxide (SiO2) with iron oxide inclusions

Red Chert (Jasper)

Microcrystalline Quartz (SiO2)

Red Jasper

Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)

Banded Chert (Flint/Jasper variety)

Microcrystalline Quartz (SiO2)

Chert

Microcrystalline Quartz (SiO2)

Chert (Yellow or Tan Chert)

Silicon Dioxide (SiO2)

Red Jasper (Banded Jasper)

Silicon Dioxide (SiO2) with Hematite impurities

Black Tourmaline

Schorl (Na(Fe²⁺)₃Al₆(OH)₄(BO₃)₃Si₆O₁₈)

Aquamarine

Beryl (Be3Al2Si6O18)

Pink Granite

Granite (Phaneritic Felsic Igneous Rock)

Jasper

Jasper (Silicon Dioxide, SiO2)

Chert / Flint

Microcrystalline or cryptocrystalline quartz (SiO2)

Pink Banded Onyx (Mexican Onyx / Calcite)

Calcite (CaCO3) - microcrystalline calcium carbonate

Chert (Black Chert / Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)