Sedimentary (Chemically Precipitated)

Blue Apatite

Fluorapatite (Ca5(PO4)3(F,Cl,OH))

Quartz Pebble

Silicon Dioxide (SiO2)

Chert (containing Quartz)

Microcrystalline Silica (SiO2)

Lake Superior Agate

Silicon Dioxide (SiO2) - variety: banded chalcedony quartzite

Banded Iron Formation

Banded Iron Formation (BIF)

Likely weathered limestone or calcite-rich stone

Limestone, primarily calcium carbonate (CaCO₃), possibly calcite

Chert (Jasper-like Silicate)

Silicon Dioxide (SiO2)

Aragonite Star Cluster

Aragonite (CaCO3)

Chert with Calcite Veining

Microcrystalline Quartz (SiO2) with Calcium Carbonate (CaCO3) veins

White Quartz Pebble

Silicon Dioxide (SiO2)

Psilomelane (Black Hematite/Manganese Ore)

Barium Manganese Oxide (Formula: BaMn9O18(OH)4)

Chert (Jasper/Agate mix)

Microcrystalline Quartz (SiO2)

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Assorted Tumbled Gemstones

Mixed oxides and silicates (including Quartz, Chalcedony, and Feldspar variants)

Tumbled green fluorite

Fluorite (calcium fluoride, CaF₂)

Jasper

Microcrystalline Quartz (SiO2)

Jasper with Quartz vug

Microcrystalline quartz (SiO2)

Jasper

Silicon Dioxide (Microcrystalline Quartz), SiO2

Jasper

Silicon dioxide (SiO2)

Jasper

Microcrystalline Quartz (SiO2)

Jasper

Silicon Dioxide (Microcrystalline Quartz)

Jasper

Microcrystalline Quartz (SiO2)

Jasper

Microcrystalline Quartz (SiO2)

Jasper

Microcrystalline Quartz (SiO2)

Jasper

Microcrystalline quartz (SiO2)

Jasper

Microcrystalline Quartz (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Likely milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Banded limestone or marble

Calcite-rich carbonate rock; likely veined limestone, possibly low-grade marble (CaCO₃)

Chert (Jasper variation)

Silicon Dioxide (SiO2)

Chert (Iron-stained)

Chert (Silicon Dioxide, SiO2)

Polished Jasper

Microcrystalline Quartz (SiO2)

Jasper

Microcrystalline Quartz (SiO2)

Jasper

Silicon Dioxide (Microcrystalline Quartz)

Green Jasper

Microcrystalline Quartz (SiO2)

Jasper

Microcrystalline Quartz (SiO2)

Banded Jasper (Carved)

Microcrystalline Quartz (SiO2)

Jasper

Silicon dioxide (Microcrystalline Quartz)

Quartz

Silicon Dioxide (SiO2)

Jasper

Silicon Dioxide (SiO2)

Jasper

Microcrystalline Quartz (SiO2)

Jasper

Microcrystalline quartz (SiO2)