Not A Rock Or Mineral

Native Gold Nugget

Native Gold (Au)

Serpentinite

Serpentinite (composed primarily of Serpentine minerals: Mg3Si2O5(OH)4)

Amygdaloidal Basalt

Amygdaloidal Basalt (extrusive volcanic rock with secondary mineral infilling)

Quartz (Fieldstone/Pebble)

Silicon Dioxide (SiO2)

Quartzite

Quartzite (SiO2)

Granite

Granite (Phaneritic Quartz-Feldspar intrusive rock)

Epidote

Epidote Group (e.g., Clinozoisite, Epidote, Piemontite), Epidote formula: Ca2(Al,Fe)3(SiO4)3(OH)

Quartzite with Hematite

Metamorphosed Quartz Sandstone (SiO2 with Fe2O3 inclusions)

Pink Sapphire

Corundum (Al2O3 with trace Chromium and Iron)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Dendritic Agate (or Dendritic Opal)

SiO2 (for Agate), SiO2·nH2O (for Opal)

Basalt with Plagioclase Phenocrysts

Porphyritic Basalt (primarily SiO2, MgO, FeO, and CaO)

Porphyritic Basalt

Amygdaloidal Porphyritic Basalt

Porphyritic Andesite

Andesite

Slate

Foliated Metamorphic Rock (composed primarily of silica and alumina with iron and magnesium)

Granite (specifically Pink or Red Granite)

Phaneritic Felsic Igneous Rock (Granite)

Petrified Wood

Silicified Wood (primarily SiO2)

Chert (Nodular)

Chert (SiO2 - Microcrystalline Quartz)

Gneiss (with Quartz and Biotite Mica)

Gneiss

Almandine Garnet

Iron aluminum silicate (Fe3Al2(SiO4)3)

Gastropod Steinkern (Fossil Snail Internal Mold)

Class Gastropoda (Internal Mold)

Sunstone (variety of Feldspar)

Oligoclase Sunstone, Plagioclase Feldspar (Na,Ca)Al(Si,Al)Si2O8

Granite (Micro-specimen)

Plutonic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Pink Granite

Granite (Phaneritic felsic intrusive igneous rock)

Pink Granite

Phaneritic Felsic Igneous Rock (Granite)

Quartz

Quartz (SiO₂)

Jasper-Agate Breccia

Silicon Dioxide (SiO2) with iron oxide inclusions

Snowflake Obsidian

Volcanic glass containing Spherulite inclusions (primarily Cristobalite, SiO2)

Greenschist (Chlorite Schist)

Greenschist (containing chlorite, actinolite, and epidote)

Banded Agate (specifically Carnelian Agate slice)

Chalcedony (cryptocrystalline variety of Quartz), SiO2

Puddingstone

Conglomerate (Indurated)

Bumblebee Jasper

Calcite-bearing Volcanic Tuff containing Sulfur and Arsenic (Orpiment/Realgar)

Clay (as a rock-forming material)

Clay minerals (e.g., Kaolinite group, Smectite group, Illite group, Chlorite group)

Liesegang Ring Siltstone

Siltstone with iron oxide Liesegang bands

Unakite

Unakitized granodiorite / Quartz-Epidote-Feldspar rock

Dyed Agate (Tumbled)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chrome Diopside

Magnesium Calcium Silicate (MgCaSi2O6) containing Chromium impurities

Moss Agate

Silicon Dioxide with inclusions (SiO2 + impurities)

Chert (or Flint)

Chert (Sedimentary Cryptocrystalline Sio2)

Fossiliferous Chert (with Brachiopod or Mollusk fragments)

Silicon dioxide (SiO2) with Calcium Carbonate (CaCO3) inclusions