Sedimentary (Chemically Precipitated) Or Metamorphic

Orange Calcite

Calcium Carbonate (CaCO3)

Quartz Vein in Sandstone

Hydrothermal Quartz (SiO2) in Arenite

Iron-rich chert or jasper

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

Turquoise

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

Yellow jasper / iron-rich chert

Microcrystalline quartz (SiO₂), commonly colored by iron oxides

Orange Calcite

Calcium Carbonate (CaCO3)

Green Calcite

Calcium Carbonate (CaCO3)

Orange Calcite

Calcium Carbonate (CaCO3)

Rhyolitic jasper or iron-stained chert

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

Calcite

Calcium Carbonate (CaCO3)

Blue Calcite

Calcium Carbonate (CaCO3)

Light-colored limestone

Calcite-rich limestone (CaCO₃)

Banded calcite (onyx marble)

Calcite, CaCO₃; commonly sold as Mexican or Pakistani onyx marble

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Pale limestone

Limestone, predominantly calcite (CaCO₃)

Likely red jasper or iron-rich chert

Microcrystalline quartz (SiO₂) colored by hematite/goethite

Weathered iron-rich chert or jasper

Microcrystalline quartz (SiO₂), variably stained by iron oxides

Chalky limestone fragment

Micritic limestone, chiefly calcite (CaCO₃)

Quartz

Silicon Dioxide (SiO2)

Weathered iron-rich chert or jasper

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

Weathered iron-rich rock, possibly hematite-bearing basalt or ironstone

Uncertain; likely Fe-oxide-rich basalt/ironstone containing hematite (Fe₂O₃), magnetite (Fe₃O₄), and silicate minerals

Limonite/Goethite Concretion

Goethite (FeO(OH))

Quartz

Silicon Dioxide (SiO2)

Orange Calcite

Calcite (Calcium Carbonate, CaCO3)

Red jasper (likely iron-rich chert)

Microcrystalline quartz, SiO₂, colored mainly by hematite/goethite

Red sandstone or iron-stained chert

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

Quartz (Raw Chunk)

Silicon Dioxide (SiO2)

Green Calcite

Calcium Carbonate (CaCO3)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Blue Apatite

Calcium phosphate fluoride, Ca5(PO4)3(F,Cl,OH)

Calcite

Calcium Carbonate (CaCO3)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz (Milky / Massive Quartz)

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)