Igneous, Sedimentary, Or Metamorphic (Mineral Based)

Sandstone (River Cobble)

Clastic sedimentary rock (primarily SiO2 with various lithic fragments)

Basalt (with possible mineral veining)

Basalt (Aphanitic Mafic Igneous Rock)

Snowflake Obsidian

Volcanic glass with Cristobalite inclusions (70–75% SiO2)

Yellow Aventurine (or Citrine-colored Quartz)

Silicon Dioxide (SiO2) with inclusions

Greenstone

Greenschist (commonly containing Chlorite, Actinolite, and Epidote)

Red Sandstone

Clastic sedimentary rock (primarily SiO2 with Fe2O3 iron oxide staining)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Granodiorite

Granodiorite (Phaneritic intrusive igneous rock containing Plagioclase, Quartz, and Biotite/Amphibole)

Strawberry Quartz

Quartz (SiO₂) with Goethite (α-FeO(OH)) and/or Lepidocrocite (γ-FeO(OH)) inclusions

Dendritic Limestone

Calcite with Manganese Oxide (Manganese Dendrites)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Diorite

Diorite

Quartz Pebble

Silicon Dioxide (SiO2)

Prehnite

Prehnite Ca2Al2Si3O10(OH)2

Raw Green Jasper

Silicon Dioxide (SiO2) with iron silicate inclusions

Chert Pebble with Quartz Veining

Microcrystalline Quartz (SiO2)

Chakra Stone (Composite / Man-made Bonded Gemstones)

Composite of Quartz, Lapis Lazuli, Aventurine, Tiger's Eye, and Jasper (SiO2, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, etc.)

Basalt

Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement

Blue Calcite

Calcium Carbonate (CaCO3)

Honey Calcite

Calcium Carbonate (CaCO3)

Pyrite in Matrix (likely Quartz or Coal)

Iron Sulfide (FeS2)

Green Calcite

Calcium Carbonate (CaCO3)

Dark Igneous Rock (Likely Basalt or Diabase)

Basalt (extrusive igneous rock) or Diabase (intrusive igneous rock - also known as Dolerite), largely composed of plagioclase feldspar, pyroxene (augite), and sometimes olivine and amphibole. Exact mineralogy would require thin section analysis.

Native Gold Nuggets

Native Gold (Au)

Aura Quartz Geodes (Lab-Altered)

Silicon Dioxide (SiO2) with Metallic Vapor Deposition

Nephrite Jade

Tremolite-Actinolite solid solution, Ca2(Mg,Fe)5Si8O22(OH)2

Schist

Schist (various compositions)

Granite

Phaneritic Igneous Rock (composed primarily of Quartz, Feldspar, and Mica)

Labradorite

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

Chalcopyrite

Chalcopyrite (CuFeS2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Dalmatian Stone (often misnamed Dalmatian Jasper)

Aplite (with hornblende/arfvedsonite inclusions)

Shale

Fissile Mudstone (primarily composed of phyllosilicate minerals like kaolinite, montmorillonite, and illite)

Rutilated Quartz

Quartz with Rutile inclusions (SiO2 with TiO2 inclusions)

Limonite-stained Granite

Felsic Plutonic Rock with Hydrated Iron Oxides

Milky Quartz (Quartz Vein)

Silicon Dioxide (SiO2)

Pink Granite

Felsic Plutonic Rock (primarily Quartz, Potassium Feldspar, and Plagioclase)

River Cobble (Conglomerate context)

Unconsolidated Fluvial Alluvium (comprised of various lithologies like Quartzite, Granite, or Basalt)

Quartz (Crystal/Druzy Quartz)

Quartz (SiO₂)

Green Aventurine

Aventurine Quartz (SiO2 with inclusions of Fuchsite)

Marble

Recrystallized Calcite (CaCO3)