Mineral (Chalcedony Variety)

Sandstone (Iron-stained)

Arenite (composed primarily of SiO2 with Fe2O3 staining)

Onyx Marble (also commonly called Onyx)

Calcite (CaCO3), often with other mineral impurities

Calcite

Calcite (CaCO3)

Greenstone (Epidote/Chlorite-rich Metabasalt)

Greenschist / Epidosite (Ca2(Al,Fe)3(SiO4)3(OH))

Citrine

Citrine (Silicon Dioxide, SiO2)

Yellow Quartz Pebble

Silicon Dioxide (SiO2)

Ferruginous Quartz (Iron-stained Quartz)

Silicon Dioxide with Iron Oxide (SiO2 with traces of Fe2O3/FeO(OH))

Sandstone

Arenite (primarily SiO2)

Blue Quartzite

Quartzite (primarily SiO2) with inclusions like Dumortierite or Magnesio-riebeckite

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of Titanium, Iron, or Manganese

Rose Quartz

SiO2 (Silicon Dioxide)

Rose Quartz

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

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)

Rose Quartz

Silicon Dioxide (SiO2)

Rose Quartz

Silicon Dioxide (SiO2) with traces of titanium, iron, or manganese

Rose Quartz

Silicon Dioxide (SiO2)

Beryl (var. Heliodor or Aquamarine)

Beryllium Aluminum Cyclosilicate (Be3Al2Si6O18)

Rose Quartz (Aura Quartz)

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

Sandstone (Picture Sandstone)

Arenite (primarily SiO2 with iron oxide impurities)

Chert (varietal Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartzite

Quartzite (High-purity SiO2)

Aventurine (likely Green Aventurine)

Aventurine (a variety of quartz, SiO₂, with common inclusions of fuchsite)

Chert (Flint variety)

Silicon Dioxide (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Chert (Flint variety)

Microcrystalline context of Quartz (SiO2)

Red Quartz (Druzy)

Silicon Dioxide (SiO2) with Hematite inclusions

Smoky Quartz

Quartz (SiO₂)

Hematite

Iron(III) oxide (Fe2O3)

Hypersthene

Hypersthene ((Mg,Fe)SiO₃)

Conglomerate

Conglomerate (Detrital sedimentary rock)

Orange Calcite (often commercially sold as Honey Calcite or Aragonite)

Calcium Carbonate (CaCO3)

Chert (Flint variety)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Quartz

Quartz (SiO₂)

Obsidian

Volcanic glass

Chert

Silicon dioxide (SiO2)

Diopside (likely Chromian Diopside)

Diopside, part of Clinopyroxene family of inosilicates. Chemical formula: CaMgSi2O6. The green variety is often Chromian Diopside due to chromium impurities.

Ferruginous Sandstone

Clastic sedimentary rock (SiO2 with Fe2O3/FeO(OH) cement)

Green Quartzite (Aventurine variety)

Silicon Dioxide (SiO2) with inclusions of Fuchsite

Jasper

Jasper (Cryptocrystalline Quartz; SiO2)

Rose Quartz

SiO2 (Silicon Dioxide)

Rose Quartz

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

Rose Quartz

SiO2 (Silicon Dioxide with trace inclusions of Phosphorus, Aluminum, or Titanium)