Sedimentary (Chemically Precipitated)

Red sandstone or iron-stained chert

Likely quartz-rich sandstone (SiO₂) or microcrystalline quartz/chert with hematite

Weathered iron-rich chert or jasper

Microcrystalline quartz (SiO₂), variably stained by iron oxides/hydroxides

Jasper

Microcrystalline Quartz (SiO2)

Quartz Geode Cluster (Iron-stained Quartz)

Silicon Dioxide (SiO2)

Possible calcite crystal fragment

Calcite (CaCO₃), tentative identification

Flint

Microcrystalline quartz (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Limestone and Sandstone Assortment

Sedimentary Rock Assemblage

Chert

Microcrystalline Quartz (SiO2)

Psilomelane (Black Hematite varietal)

Barium Manganese Oxide (Ba,H2O)2Mn5O10

Sedimentary Rock

Sedimentary rock (lithified sediment)

Chert

Silicon dioxide (SiO2)

Chert or Flint

Silicon dioxide (SiO2)

Banded iron formation (iron-rich metamorphic rock)

BIF; alternating chert/quartz and hematite–magnetite layers

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Quartz fragment

Silicon Dioxide (SiO2)

Chert (Flint / Jasper / Hornstone)

Microcrystalline Quartz (SiO2)

Hematite

Hematite, Iron(III) oxide (Fe2O3)

Orange Calcite

Calcium Carbonate (CaCO3)

Sandstone (Ferruginous)

Arenite (SiO2 based with Fe2O3 banding)

Chert (Jasper/Agate variety)

Silicon Dioxide (SiO2)

Jasper

Silicon Dioxide (SiO2)

Chert

Chert (SiO2)

Green Calcite

Calcium Carbonate (CaCO3)

Quartz (Milky/Crystalline fragment)

Silicon Dioxide (SiO2)

Jasper

Microcrystalline Quartz (SiO2)

Chert / Jasper

Silicon Dioxide (SiO2)

Chert Nodule

Chert / Microcrystalline Quartz (SiO2)

Chert (Jasper/Chalcedony)

Microcrystalline Quartz (SiO2)

Honey Calcite

Calcium Carbonate (CaCO3)

Yellow Calcite

Calcium Carbonate (CaCO3)

Limonite/Ironstone

Limonite (FeO(OH)·nH2O)

Wonderstone Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Yellow Ochre / Limonite

Hydrated ferric oxide (FeO(OH)·nH2O)

Chert (Iron-stained)

Silicon Dioxide (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Limonite (Iron Ore)

Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)

Onyx Marble (Banded Calcite)

Calcite (Calcium Carbonate, CaCO3)

Quartz-rich metamorphic rock, likely milky quartz or quartzite

Quartz (SiO₂); possibly quartzite composed predominantly of recrystallized quartz

Orange Calcite

Calcium Carbonate (CaCO3)

Quartz vein rock (milky quartz)

Milky quartz, SiO₂; likely quartz-rich vein material in altered host rock

Gold Ore

Native Gold (Au)