Marble

Metamorphosed Limestone (principally CaCO3)

metamorphic

Quartz Pebble

Silicon Dioxide (SiO2)

sedimentary

Amethyst

Silicon Dioxide (SiO2) with iron impurities

mineral

Chert (Flint)

Microcrystalline Quartz (SiO2)

sedimentary

Pink Quartzite

Quartzite (primarily SiO2)

metamorphic

Quartzite

Quartzite (SiO2)

metamorphic

Quartzite

Quartzite (primarily SiO2)

metamorphic

Pink Quartzite

Quartzite (primarily SiO2)

metamorphic

Pink Quartzite

Quartzite (SiO2 with minor iron oxide impurities)

metamorphic

Quartzite

Quartzite (SiO2)

metamorphic

Rose Quartz

Silicon dioxide (SiO2) with trace amounts of titanium, iron, or manganese

mineral

Quartz

Silicon Dioxide (SiO2)

mineral

Sandstone

Arenite

sedimentary

Potassium Feldspar (Orthoclase)

Orthoclase (KAlSi3O8)

mineral

Rough Diamond

Carbon (C)

mineral

Quartzite

Quartzite (SiO2)

metamorphic

Honey Calcite

Calcite (Calcium Carbonate, CaCO3)

mineral

Black Spinel

Magnesium Aluminum Oxide (MgAl2O4)

mineral

Lepidolite

Lepidolite - K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2

mineral

Caribbean Calcite

Calcium Carbonate with Argonite (CaCO3)

mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

mineral

Amazonite

Microcline (KAlSi3O8) with lead impurities

mineral

Ocean Jasper

Orbicular Jasper (Silicon Dioxide, SiO2)

mineral

Black Sand (Magnetite Sand)

Magnetite (Fe3O4)

mineral

Chert (Yellow Jasper/River Pebble)

Microcrystalline Quartz (SiO2)

sedimentary

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

metamorphic

Moss Agate

Chalcedony (Silicon Dioxide) with dendritic inclusions (SiO2)

Mineral

Banded Agate (Crazy Lace/Mexican Agate Variety)

Silicon Dioxide (SiO2)

mineral

Red Moss Agate (Jasper)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

sedimentary

Black Spinel

Magnesium Aluminum Oxide (MgAl2O4)

mineral

Banded Calcite (often sold as Mexican Onyx or Aragonite)

Calcite/Aragonite (Calcium Carbonate, CaCO3)

sedimentary

Sunstone with Moonstone (Peach Moonstone)

Orthoclase Feldspar (KAlSi3O8)

mineral

Honey Calcite

Calcium Carbonate (CaCO3)

mineral

Ocean Jasper

Orbicular Jasper (SiO2)

sedimentary

Red Tiger Eye (or Polished Jasper Gneiss)

Silicon dioxide with crocidolite inclusions (SiO2)

metamorphic

Honey Calcite (Orange Onyx)

Calcium Carbonate (CaCO3)

mineral

Ocean Jasper

Orbicular Jasper (Silicon Dioxide - SiO2)

sedimentary

Angelite

Anhydrite (Calcium Sulfate, CaSO4)

mineral

Cream Marble (Speckled)

Metamorphosed Limestone (mainly CaCO3)

metamorphic

Golden Healer Quartz

Silicon Dioxide (SiO2) with iron oxide inclusions

mineral

Polished Ocean Jasper

Orbicular Jasper (variety of Chalcedony/Quartz, SiO2)

mineral

Rhodonite

Manganese Inosilicate (Mn,Fe,Mg,Ca)SiO3

mineral