Granodiorite rock specimen

Granodiorite

Granodiorite (Intermediate intrusive igneous rock)

igneous

Limestone (specifically Bituminous or Carbonaceous Limestone) rock specimen

Limestone (specifically Bituminous or Carbonaceous Limestone)

Calcium Carbonate (CaCO3) with Organic Impurities

sedimentary

Quartz rock specimen

Quartz

Quartz (Silicon Dioxide, SiO2)

mineral

Chert (and Flint variant) rock specimen

Chert (and Flint variant)

Silicon Dioxide (SiO2)

sedimentary

Rhyolite Pebble rock specimen

Rhyolite Pebble

Rhyolite

igneous

Green Quartzite rock specimen

Green Quartzite

Quartzite (primarily SiO2 with chlorite inclusions)

metamorphic

Smoky Quartz rock specimen

Smoky Quartz

Silicon Dioxide (SiO2)

mineral

Milky Quartz rock specimen

Milky Quartz

Silicon dioxide (SiO2)

mineral

Sodalite rock specimen

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

mineral

Citrine Quartz (Yellow Quartz) rock specimen

Citrine Quartz (Yellow Quartz)

Silicon Dioxide (SiO2) with iron impurities

mineral

Amethyst rock specimen

Amethyst

Amethyst (Silicon Dioxide, SiO2)

mineral

Yellow Agate rock specimen

Yellow Agate

Silicon Dioxide (SiO2)

mineral

Blue Quartz (Aventurine) rock specimen

Blue Quartz (Aventurine)

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

mineral

Chert (specifically Red Chert or Jasper) rock specimen

Chert (specifically Red Chert or Jasper)

Microcrystalline Quartz (SiO2)

sedimentary

Desert Rose rock specimen

Desert Rose

Gypsum or Barite (CaSO4·2H2O or BaSO4)

mineral

Sandstone Concretion rock specimen

Sandstone Concretion

Clastic sedimentary rock (primarily Quartz SiO2)

sedimentary

Sedimentary Breccia rock specimen

Sedimentary Breccia

Clastic Breccia (CaCO3/SiO2 matrix)

sedimentary

Chert (Jasper/Agate variety) rock specimen

Chert (Jasper/Agate variety)

Microcrystalline quartz (SiO2)

sedimentary

Fossiliferous Limestone with Rugose Coral rock specimen

Fossiliferous Limestone with Rugose Coral

Rugosa (order), typically preserved in CaCO3 (Calcite)

sedimentary

Agate (Crazy Lace or Eye Agate) rock specimen

Agate (Crazy Lace or Eye Agate)

Silicon Dioxide (SiO2)

mineral

Serpentine rock specimen

Serpentine

Antigorite, Lizardite, or Chrysotile (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4

metamorphic

White Marble rock specimen

White Marble

Recrystallized Calcite (CaCO3)

metamorphic

Chert (Flint/Jasper variety) rock specimen

Chert (Flint/Jasper variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

sedimentary

Banded Agate (Agatized Geode Slice) rock specimen

Banded Agate (Agatized Geode Slice)

Silicon Dioxide (SiO₂)

mineral

Banded Agate / Lace Agate rock specimen

Banded Agate / Lace Agate

Agate (Silica/Quartz) - SiO2

mineral

Smoky Quartz rock specimen

Smoky Quartz

Silicon Dioxide (SiO₂)

mineral

Quartz (Milky/Iron-stained) rock specimen

Quartz (Milky/Iron-stained)

Silicon Dioxide (SiO2)

mineral

Dragon Vein Agate rock specimen

Dragon Vein Agate

Silicon Dioxide (SiO2)

mineral

Quartz (Tumbled/Polished Pebble) rock specimen

Quartz (Tumbled/Polished Pebble)

Silicon Dioxide (SiO2)

mineral

Banded Agate rock specimen

Banded Agate

Agate (Cryptocrystalline variety of Quartz, SiO2)

mineral

Red Jasper rock specimen

Red Jasper

Silicon Dioxide (SiO2) with Iron inclusions

sedimentary

Sandstone (Quartzose Sandstone) rock specimen

Sandstone (Quartzose Sandstone)

Arenite (SiO2)

sedimentary

Milky Quartz Pebble rock specimen

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

mineral

Chert (Nodule) rock specimen

Chert (Nodule)

Silicon Dioxide (SiO2)

sedimentary

Chert (Jasper/Flint variety) rock specimen

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

sedimentary

Siltstone rock specimen

Siltstone

Siltstone (primarily SiO2 with Al2O3)

sedimentary

Serpentinite rock specimen

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)

metamorphic

Chert (specifically Gray Chert) rock specimen

Chert (specifically Gray Chert)

Silicon Dioxide (SiO2)

sedimentary

Sandstone (likely Graywacke or Arkose variant) rock specimen

Sandstone (likely Graywacke or Arkose variant)

Clastic Sedimentary Rock (SiO2 based)

sedimentary

Granite rock specimen

Granite

Granite (Felsic intrusive igneous rock)

igneous

Basalt rock specimen

Basalt

Basalt (principally Plagioclase and Pyroxene)

igneous

Geode (Chert or Quartz Nodule) rock specimen

Geode (Chert or Quartz Nodule)

Silicon Dioxide (SiO2)

sedimentary