Sedimentary Rock (Technically A Variety Of Chalcedony)

Red Jasper

Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)

Green Jasper with Quartz veins

Jasper (Silicon Dioxide, SiO2)

Carnelian (Chalcedony variety)

SiO2 (Silicon Dioxide)

Blue Chalcedony

Silicon Dioxide (SiO2)

Tumbled brown banded agate

Chalcedony (microcrystalline quartz), SiO₂, with iron-oxide inclusions

Jasper (Iron-stained Chalcedony)

SiO2 with Fe2O3 (Iron Oxide) impurities

Jasper (Red/Brown Variety)

Jasper (Silicon Dioxide, SiO2 plus Iron Oxide impurities)

Polished carnelian/chalcedony

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony

Agate

Silicon Dioxide (Chalcedony), SiO2

Carnelian (red-orange chalcedony)

Chalcedony, microcrystalline quartz (SiO₂), iron-oxide colored

Polished carnelian

Cryptocrystalline chalcedony (SiO₂), orange-red variety colored mainly by iron oxides

Red Jasper

Silicon Dioxide (SiO2) with hematite inclusions

Satin Spar (often marketed as Selenite)

Gypsum (CaSO4·2H2O)

Red jasper (likely iron-rich chert)

Microcrystalline quartz (SiO₂), colored by hematite/goethite; possibly brecciated jasper

Agate

Silicon dioxide (SiO2)

Jasper

Silicon Dioxide (SiO2) with impurities

Polished banded agate heart

Microcrystalline quartz (SiO₂), primarily chalcedony with iron-oxide inclusions

Polished banded agate (likely blue lace agate)

Chalcedony, microcrystalline SiO₂, with iron and other trace-element impurities

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Tumbled orange chalcedony or carnelian

Microcrystalline quartz (SiO₂), likely iron-bearing chalcedony

Red jasper (likely tumbled)

Jasper, microcrystalline quartz/chalcedony (SiO₂), colored mainly by iron oxides

Green Jasper

Silicon Dioxide (SiO2) with impurities

Iron-stained jasper (likely orbicular/brecciated jasper)

Microcrystalline quartz, SiO₂, colored by iron oxides/hydroxides

Jasper with Agate Inclusions

Silicon Dioxide (SiO2) - variety of Quartz/Chert

Dyed Agate

SiO2

Red jasper

Microcrystalline quartz (chalcedony), SiO₂, colored mainly by iron oxides

Kambaba Jasper

Stromatolite (Microbial mat fossil in silicified sediment)

Polished multicolored jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), likely iron- and manganese-stained chert

Banded Agate

Chalcedony (SiO2)

Agate Nodule / Weathered Agate

Silicon Dioxide (Chalcedony / Quartz, SiO2)

Polished black stone, likely black tourmaline or black obsidian

Most consistent with schorl tourmaline (NaFe3Al6(BO3)3Si6O18(OH)4), though black obsidian (volcanic glass) is also possible

Polished red jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides

Brecciated jasper

Chalcedony–quartz aggregate, predominantly SiO₂, with iron-oxide coloring

Chalcedony (Agate and Jasper Pebbles)

Microcrystalline Quartz (SiO2)

Chert (Jasper/Agate variety)

Cryptocrystalline Quartz (SiO2)

Bauxite

Hydrated aluminum oxides (mixture of gibbsite, boehmite, and diaspore)

Bumble Bee Jasper

Calcite and Volcanic Ash Mixture

Agate

SiO2

Carnelian

Silicon Dioxide (Quartz variety, SiO2)

Tumbled amber-colored chalcedony or jasper

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper

Yellow Agate

Silicon Dioxide (SiO2)

Tumbled Yellow Chalcedony / Iron-Stained Quartz

Silicon Dioxide (SiO2)