Sedimentary (Chemically Precipitated Mineral)

Jasper (likely Polychrome or Desert Jasper)

Silicon Dioxide (SiO2) with impurities

Jasper (likely a variety of Yellow or Mustard Jasper)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Bumblebee Jasper

Travertine (Calcite/Aragonite) with Realgar, Pyrite, and Volcanic Ash

White quartz cluster

Quartz (silicon dioxide, SiO₂), likely a drusy or microcrystalline cluster

Weathered iron-rich rock, possibly ironstone or altered basalt

Indeterminate; likely ferruginous basalt/ironstone containing hematite-goethite and silicate minerals

Turquoise

Hydrated phosphate of copper and aluminium - CuAl6(PO4)4(OH)8·4H2O

Reddish quartz-rich rock, possibly jasper or chert

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

Chert (Jasper/Jasperoid)

Chert (chemically precipitated microcrystalline Quartz, SiO2)

Quartz Vein in Sandstone

Hydrothermal Quartz (SiO2) in Arenite

Limonite/Goethite Concretion

Goethite (FeO(OH))

Yellow jasper / iron-rich chert

Microcrystalline quartz (SiO₂), commonly colored by iron oxides

Iron-rich chert or jasper

Microcrystalline quartz (SiO₂), likely hematite/goethite-bearing

Weathered iron-rich chert or jasper

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

Chert

Chert (Microcrystalline Quartz, SiO2)

Tumbled iron-rich chert or jasper

Microcrystalline quartz (SiO₂), likely limonitic/hematitic variety

Weathered limestone fragment

Calcite-rich limestone (CaCO₃), possibly fossiliferous or brecciated

Weathered quartz-rich rock, possibly chert or quartzite

Indeterminate; likely microcrystalline quartz (SiO₂), possibly quartzite or chert

Weathered limestone pebble

Limestone, predominantly calcite (CaCO₃), possibly fossiliferous or oolitic

Likely calcite-bearing limestone

Calcite (CaCO₃), probably in a porous limestone fragment

Weathered limestone

Micritic limestone, primarily calcite (CaCO₃)

Likely limestone fragment

Calcite-rich carbonate rock; primarily calcium carbonate (CaCO₃)

Chert (Iron-Stained)

Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3) impurities

Jasper

Microcrystalline Quartz (SiO2)

Banded jasper / iron-rich chert (probable)

Microcrystalline quartz (SiO₂) with iron oxides/hydroxides and clay minerals

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Weathered chert or siliceous limestone

Microcrystalline quartz (SiO₂), possibly replacing or cementing carbonate rock

Tufa

Calcareous Tufa (Calcium Carbonate, CaCO3)

Quartz Geode Cluster (Iron-stained Quartz)

Silicon Dioxide (SiO2)

Chert

Microcrystalline Quartz (SiO2)

Psilomelane (Black Hematite varietal)

Barium Manganese Oxide (Ba,H2O)2Mn5O10

Yellow Ochre / Limonite

Hydrated ferric oxide (FeO(OH)·nH2O)

Limonite/Ironstone

Limonite (FeO(OH)·nH2O)

Polished banded chert or jasper

Microcrystalline quartz (SiO₂), likely iron- and manganese-stained chert/jasper

Red Jasper Pebble

Microcrystalline Quartz (SiO2)

Iron-rich chert or jasper

Microcrystalline quartz (SiO₂), colored by hematite/goethite inclusions

Sandstone (Ferruginous)

Arenite (SiO2 based with Fe2O3 banding)

Rhyolitic jasper or iron-stained chert

Microcrystalline quartz (SiO₂), likely with hematite/goethite staining

Orange Calcite

Calcium Carbonate (CaCO3)

Light-colored limestone

Calcite-rich limestone (CaCO₃)

Quartz vein rock (milky quartz)

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

Quartz fragment

Silicon Dioxide (SiO2)

Chert (Flint / Jasper / Hornstone)

Microcrystalline Quartz (SiO2)