Sedimentary (Processed Mineral Product)

Chert (Arrowhead Point)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Quartz Vein in Siltstone

Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix

Dyed Quartz (often sold as 'Blue Quartz' or 'Blue Agate')

Silicon Dioxide (SiO2) with artificial pigment

Gneiss (specifically a granitic gneiss cobble)

Gneiss (high-grade regional metamorphic rock)

Grey River Stone (Quartz-rich Quartzite/Siltstone)

Quartzite / Meta-siltstone (primarily SiO2)

Marble

Marble (metamorphosed limestone or dolostone), primarily composed of calcite (CaCO3) or dolomite (CaMg(CO3)2)

Agate (specifically, multi-colored or pastel-dyed agate)

Silicon dioxide (SiO2) - specifically, a cryptocrystalline variety of quartz known as Chalcedony, with banding classified as Agate. (If it were Fluorite, the chemical formula would be Calcium Fluoride - CaF2).

Banded Iron Formation (BIF) with Quartz

Banded Iron Formation, often composed of alternating layers of hematite (Fe2O3) or magnetite (Fe3O4) and chert (microcrystalline quartz, SiO2)

Shale

Shale (clastic sedimentary rock)

Caliche (also known as hardpan, calcrete, kankar)

Primarily composed of calcium carbonate (CaCO₃), often mixed with other minerals like quartz, clay minerals, and iron oxides.

Chert (Arrowheads)

Microcrystalline Quartz (SiO2)

Biotite (Mica)

Biotite (K(Mg,Fe)3AlSi3O10(OH,F)2)

Red Jasper (Opaque Chalcedony)

Silicon Dioxide (SiO2) with Hematite inclusions

Red Jasper

Silicon dioxide (SiO2) with iron oxide (Fe2O3) inclusions

Jasper with Quartz Veining

Silicon Dioxide (SiO2) - Cryptocrystalline Chalcedony

Unidentified Rock Fragment

Unknown

Quartz Pebble

Quartz (Silicon Dioxide - SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Jasper and Ironstone (likely Jasperized Ironstone)

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3)

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz (Crystal Cluster)

Silicon Dioxide (SiO2) - Quartz Variety

Orange Calcite Sphere

Calcium Carbonate (CaCO3)

Banded Gneiss

Gneiss (High-grade metamorphic rock)

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Petrified Wood

Silicified wood (primarily SiO2)

Chert (Flint Nodule)

Microcrystalline or cryptocrystalline quartz (SiO2)

Limestone (specifically Crushed Limestone/Calcictic)

Calcium Carbonate (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Greenstone

Metamorphosed Mafic Igneous Rock

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Brown Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

River Rock (likely Basalt or Greywacke)

Basalt or Lithic Sandstone

Chert (Flint)

Silicon Dioxide (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Pink Dyed Agate (Pink Agate Slice)

Silicon Dioxide (SiO2) - Chalcedony / Cryptocrystalline Quartz

Limestone

CaCO3 (principally Calcite)

Banded Gneiss (Variety of Gneiss)

Gneiss (specifically, a variety exhibiting prominent banding; mineral composition can vary, but often contains quartz, feldspar, mica, and amphibole)

Arsenopyrite with Schist Matrix

Arsenopyrite (FeAsS)

Mixed Tumbled Gemstones and River Rocks

Mixed Decorative Stones (predominantly Silicon Dioxide - SiO2 variants)

Nephrite Jade

Nephrite

Concretion

Various mineral compositions, typically carbonate or iron oxide cemented sediment

Quartzite Pebble

Quartzite (SiO2)