All rocks & minerals

Chert

Chert (SiO2)

Fossiliferous Limestone

Biogenic Calcium Carbonate (CaCO3)

Aventurine Quartz

Silicon Dioxide (SiO2) with inclusions of Fuchsite mica

Milky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

Calcite in Matrix

Calcium Carbonate (CaCO3)

Limonite (Ironstone Concretion)

Hydrous ferric oxides (FeO(OH)·nH2O)

Amethyst Quartz (Chevron Amethyst)

Silicon Dioxide (SiO2) with iron impurities

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Snowflake Obsidian

Spherulitic Obsidian (contains Cristobalite inclusions)

Chert (specifically Flint or Nodular Chert)

Silicon Dioxide (SiO2)

Mixed Crushed Stone

Aggregate (varied mineral composition)

Obsidian

Obsidian (Volcanic glass), SiO2 (70% or more)

Pyrite

Iron Sulfide (FeS2)

Labradorite

(Ca, Na)(Al, Si)4O8

Orange Calcite

Calcium Carbonate (CaCO3)

Sunstone

Feldspar (variety Oligoclase or Labradorite), (Ca,Na)(Al,Si)4O8

Quartz Geode

Silicon Dioxide (SiO2)

Yellow Quartz or Citrine Geode/Cluster

Silicon Dioxide (SiO2)

Chalcedony on Matrix

Silicon Dioxide (SiO2)

Greenshist / Chlorite Schist

Chlorite schist (contains (Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartzite

Quartzite (SiO2)

Diamond (Faceted Gemstone)

Native Carbon (C)

Diamond

Diamond (C)

Diamond

C (Native Carbon)

Diamond

Diamond (pure carbon, C)

Cubic Zirconia

Zirconium Dioxide (ZrO2)

Diamond

Native Carbon (C)

Natural Diamond (Faceted)

Diamond (pure carbon crystal, C)

Diamond (Faceted)

Carbon (C)

Diamond

Carbon (C)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Diamond

C (Native Carbon)

Diamond

Carbon (C)

Diamond

Carbon (C), Native Element

Diamond

Diamond (pure Carbon, C)

Diamond

Carbon (C)

Moissanite

Silicon Carbide (SiC)

Micrometeorite (Spherule)

Extraterrestrial Accretion Spherule

Peridot

Olivine ((Mg, Fe)2SiO4)

Diamond

Carbon (C)