Sedimentary (Chemically Precipitated) Or Metamorphic

Jasper (with orbicular/unakitoid tendencies)

Silicon Dioxide (SiO2) with iron and epidote inclusions

Weathered quartz-rich rock, possibly chert or quartzite

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

Jasper

Microcrystalline Quartz (SiO2)

Ironstone (iron-oxide-rich rock)

Ironstone, composed mainly of hematite (Fe₂O₃) and/or goethite (FeO(OH)); exact minerals cannot be confirmed visually

Bumblebee Jasper

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

Chert (Jasper/Jasperoid)

Chert (chemically precipitated microcrystalline Quartz, SiO2)

Quartz fragment

Silicon Dioxide (SiO2)

Reddish quartz-rich rock, possibly jasper or chert

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

Iron-rich chert or jasper

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

Quartz (Milky/Crystalline fragment)

Silicon Dioxide (SiO2)

Quartz-rich metamorphic rock, likely milky quartz or quartzite

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

Quartz vein rock (milky quartz)

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

Chert

Chert (Microcrystalline Quartz, SiO2)

Banded iron formation (iron-rich metamorphic rock)

BIF; alternating chert/quartz and hematite–magnetite layers

Weathered iron-rich rock, possibly ironstone or altered basalt

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

Yellow Calcite

Calcium Carbonate, CaCO3

Orange Calcite

Calcium Carbonate (CaCO3)

Onyx Marble (Banded Calcite)

Calcite (Calcium Carbonate, CaCO3)

White quartz cluster

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

Tumbled iron-rich chert or jasper

Microcrystalline quartz (SiO₂), likely limonitic/hematitic variety

Orange Calcite

Calcium Carbonate (CaCO3)

Weathered limestone fragment

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

Weathered limestone pebble

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

Likely calcite-bearing limestone

Calcite (CaCO₃), probably in a porous limestone fragment

Orange Calcite

Calcium Carbonate (CaCO3)

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

Calcite

Calcium Carbonate (CaCO3)

Calcite

Calcium Carbonate (CaCO3)

Iceland Spar (Optical Calcite)

Calcite (CaCO3)

Red Jasper Pebble

Microcrystalline Quartz (SiO2)

Blue Calcite

Calcium Carbonate (CaCO3)

Quartz

Silicon Dioxide (SiO2)

Banded jasper / iron-rich chert (probable)

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

Quartz

Silicon Dioxide (SiO2)

Blue Calcite

Calcium Carbonate (CaCO3)

Calcite

Calcium Carbonate (CaCO3)

Calcite (with iron oxide staining)

Calcium Carbonate (CaCO3)

Weathered chert or siliceous limestone

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

Polished banded chert or jasper

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

Tufa

Calcareous Tufa (Calcium Carbonate, CaCO3)