Green Chalcedony

Silicon Dioxide (SiO2) with trace minerals

mineral

Bauxite (Pisolitic Bauxite)

Bauxite (mixture of Hydrous Aluminum Oxides)

sedimentary

Pink Quartz (Rose Quartz)

Silicon Dioxide (SiO2)

mineral

Basalt with Iron Oxidation

Vesicular Basalt (Aphanitic Mafic Igneous Rock)

igneous

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement

sedimentary

Jasper Agate (Chalcedony)

Silicon Dioxide (SiO2)

sedimentary

Yellow Jasper

Silicon dioxide (SiO2)

sedimentary

Mexican Crazy Lace Agate

Silicon Dioxide (SiO2) with iron and aluminum inclusions

mineral

Clear Quartz

Silicon Dioxide (SiO2)

mineral

Carnelian Agate

Silicon Dioxide (SiO2) with high Iron Oxide impurities

mineral

Green Banded Agate

Agate (Cryptocrystalline variety of Quartz, SiO2)

mineral

Agate (Carnelian-Blue Agate mix)

Silicon Dioxide (SiO2)

mineral

Blue Calcite

Calcium Carbonate (CaCO3)

mineral

Amazonite

K(AlSi3O8) - Microcline (Var. Amazonite)

mineral

Rhodonite

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

mineral

Granite Pebble

Granite (Phaneritic intrusive igneous rock)

igneous

Granite

Phaneritic Granocrystalline Igneous Rock

igneous

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

mineral

Basalt

Basalt (dominated by plagioclase feldspar and pyroxene)

igneous

Pyrite

Iron Sulfide (FeS2)

mineral

Chert (with Iron Staining)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

sedimentary

Chalcopyrite in Quartz (Gossan/Iron Hat)

CuFeS2 (Chalcopyrite) with SiO2 (Quartz)

mineral

Petrified Wood (Agatized/Silicified Wood)

Silicified Wood (SiO2)

metamorphic

Red Sandstone

Arenite (primarily Quartz with Iron Oxide)

sedimentary

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

mineral

Smoky Quartz

Silicon Dioxide (SiO2)

mineral

Yellow Quartzite (River Pebble)

Quartzite (SiO2)

metamorphic

Sandstone

Clastic Sedimentary Rock (primarily Quartz, SiO2)

sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Iron oxide inclusions

sedimentary

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2)

sedimentary

Pink Lepidolite

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

mineral

Granite

Granite (Felsic Intrusive Igneous Rock)

igneous

Yellow Quartzite Pebble

Quartzite (primarily Silicon Dioxide - SiO2)

metamorphic

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

mineral

Jasper

Jasper / Silicon Dioxide (SiO₂)

sedimentary

Fossiliferous Limestone (Chertified Limestone)

Calcium Carbonate (CaCO3) often replaced by Microcrystalline Silica (SiO2)

sedimentary

Smoky Quartz (with Iron Oxidation)

Silicon Dioxide (SiO2)

mineral

Calcite

Calcium Carbonate (CaCO3)

mineral

Optical Calcite (Iceland Spar)

Calcite (Calcium Carbonate, CaCO3)

mineral

Blue Calcite

Calcium Carbonate (CaCO3)

mineral

Limonite (Iron-rich Siltstone / Sandstone base)

Hydrous ferric oxide mixture (FeO(OH)·nH2O)

sedimentary