Mineral Like Byproduct (Often Mistaken For Igneous Rock Or Meteorite)

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Gneiss (Metamorphic Cobble)

Gneiss

Granite

Granite (Felsic Plutonic Rock)

Breccia

Breccia - Clastic sedimentary rock

Granite

Granite (Felsic intrusive igneous rock)

Turquoise

Turquoise (Hydrated copper aluminum phosphate, CuAl6(PO4)4(OH)8·4H2O)

Blue Apatite

Apatite-(CaF), Ca5(PO4)3F

Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Sandstone (Quartzite-rich Cobble)

Clastic sedimentary rock (primarily SiO2)

Granite with Orthoclase and Hematite Staining

Phaneritic Felsic Igneous Rock (primarily SiO2 with KAlSi3O8)

Basalt

Extrusive mafic igneous rock

Porphyritic Basalt (Chinese Writing Stone/Flower Stone)

Porphyritic Basalt (primarily Plagioclase Feldspar in a Mafic groundmass)

Sodalite

Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2)

Amygdaloidal Basalt

Basalt with secondary mineral infilling (commonly Zeolite, Calcite, or Quartz)

Sandstone

Arenite (primarily SiO2)

Agate

Silicon Dioxide (SiO2)

Slickenside

Tectonic Fault Scarp Surface

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Sandstone (Quartzose Sandstone)

Arenite

Milky Quartz

Silicon Dioxide (SiO2)

Pyrite in Shale

Iron Sulfide (FeS2) in Sedimentary Matrix

Quartz on Schist

Silicon Dioxide (SiO2) on Foliated Metamorphic Rock

Green Jasper with Quartz veins

Jasper (Silicon Dioxide, SiO2)

Granite (with Orthoclase and Quartz)

Phaneritic Felsic Igneous Rock (KAlSi3O8 + SiO2)

Rose Quartz

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

Smoky Quartz (Tumbled)

Smoky Quartz (Silicon Dioxide - SiO2)

Banded Agate

Agate (Cryptocrystalline variety of Quartz, SiO2)

Geode with Quartz and possibly Jasper/Hematite

Quartz (SiO2) and Chalcedony (cryptocrystalline SiO2), possibly stained by iron oxides

Sandstone

Arenite (primarily SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Basalt with Iron Oxidation

Mafic Igneous Basalt

Quartz Pebble

Silicon Dioxide (SiO2)

Amygdaloidal Basalt

Amygdaloidal Basalt (Ca-rich Plagioclase, Pyroxene, and Olivine)

Greenstone

Greenschist (containing chlorite, epidote, and actinolite)

Vesicular Basalt with Secondary Mineral Infill

Mafic Volcanic Rock (Basalt)

Pyrite

Iron Sulfide (FeS2)

Sandstone

Arenite (SiO2 primarily)

Blue Quartz (Aventurine)

Silicon Dioxide (SiO2) with fibrous inclusions (commonly Dumortierite)

Quartz (Drusy/Crystalline)

Silicon Dioxide (SiO2)

River Quartz (Milky and Smoky mix)

Silicon Dioxide (SiO2)

Black Obsidian

Volcanic Glass (SiO2)