Quartz Pebble

Silicon Dioxide (SiO2)

mineral

Fluorite

Fluoride (Calcium Fluoride - CaF2)

mineral

Basalt (Fieldstone)

Basalt

igneous

Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2AlSi3O10(OH,F)2)

metamorphic

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

metamorphic

Botryoidal Quartz / Calcite Geode crust

Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3)

mineral

Smoky Quartz in Matrix

Silicon Dioxide (SiO2)

mineral

Basalt

Extrusive mafic igneous rock

igneous

Amber

Succinite (organic fossilized resin)

mineraloid

Granodiorite

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

igneous

Quartz / Citrine Quartz

Silicon Dioxide (SiO2)

mineral

Sandstone (Quartzose Sandstone)

Clastic Sedimentary Rock (primarily SiO2)

sedimentary

Marble

Recrystallized Calcite (CaCO3)

metamorphic

Slag (Industrial Glass)

Anthropogenic Vitreous Slag (Post-industrial byproduct)

igneous

Vesicular Basalt

Vesicular Basalt (Aphanitic Mafic Rock)

igneous

Sandstone (Quartzose)

Arenite (primarily SiO2)

sedimentary

Sandstone (likely Siltstone or fine-grained Sandstone)

Sedimentary Rock (Clastic)

sedimentary

Fuchsite Gneiss (Green Quartzite)

Chromium-rich Muscovite (KAl2(AlSi3O10)(OH)2 with Cr replacements)

metamorphic

Quartzite with Chlorite

Metamosphosed Quartz Sandstone (SiO2 with (Mg,Fe)3(Si,Al)4O10(OH)2 inclusions)

metamorphic

Basalt

Basalt

igneous

Andesite

Andesite (Intermediate Volcanic Rock)

igneous

Quartzite

Quartzite (primarily SiO2)

metamorphic

Concrete / Conglomerate (Man-made)

Artificial Conglomerate (Cementitious Composite)

sedimentary

Sandstone (Graywacke type)

Clastic Sedimentary Rock (Lithic Sandstone)

sedimentary

Quartzite Pebble

Quartzite (primarily SiO2)

metamorphic

Sandstone (likely Calcareous or Micaceous)

Clastic sedimentary rock (primarily Quartz with Cementing Agents)

sedimentary

Limestone

Calcium Carbonate (CaCO3)

sedimentary

Limestone

Calcium Carbonate (CaCO3)

sedimentary

Greenschist

Greenschist (composed of Chlorite, Actinolite, and Epidote)

metamorphic

Limestone

Calcium Carbonate (CaCO3)

sedimentary

Sandstone (lithic wacke)

Arenite / Lithic Wacke (mostly SiO2 with rock fragments)

sedimentary

Granite

Granite (Phaneritic igneous rock)

igneous

Glauconitic Sandstone

Glauconitic Quartz Arenite

sedimentary

Sandstone (Weathered)

Arenite (primarily SiO2)

sedimentary

Sandstone Concretion

Ferruginous Sandstone Concretion

sedimentary

Marble

Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)

metamorphic

Quartz Geode

Silicon Dioxide (SiO2)

mineral

Pink Granite

Phaneritic Felsic Igneous Rock (Granite)

igneous

Diorite

Diorite (intermediate intrusive igneous rock)

igneous

Basalt

Basalt

igneous

Quartz Vein in Schist

Quartz (SiO2) in Mica Schist

metamorphic

Hemimorphite on Limonite Gossan

Hemimorphite (Zn4Si2O7(OH)2·H2O) on Limonite matrix

mineral