This Is Not A Rock Or Mineral

Schist

Schist (primarily mica-schist)

Conglomerate

Conglomerate (clastic sedimentary rock)

Quartz Pebble (with probable inclusions or staining)

Quartz (Silicon Dioxide - SiO2)

Gastropod Steinkern (Internal Mold Fossil)

Gastropoda (Class); Internal mold or 'Steinkern' composed of Calcium Carbonate (CaCO3) or Sedimentary matrix

Quartz Vein Outcrop

Silicon Dioxide (SiO2)

Sandstone

Arenite (primarily SiO2)

Picture Jasper

Silicon dioxide (SiO2)

Kambaba Jasper (Crocodile Jasper)

Stromatolitic Rhyolite/Jasper (SiO2)

Blue Banded Agate (Dyed)

Silicon Dioxide (SiO2) - variety of Chalcedony

Gold Ore (in Quartz/Sulfide matrix)

Native Gold (Au) in Quartz (SiO2) and Pyrite (FeS2)

Flower Agate

Chalcedony (Silicon Dioxide, SiO2) with Opaque Spherulitic Inclusions

Quartzite

Quartzite (primarily SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Peridot

Olivine ((Mg, Fe)2SiO4)

Milky Quartz

Silicon Dioxide (SiO2)

Aquamarine

Beryl (Be3Al2Si6O18 with iron impurities)

Amethyst

Amethyst (Silicon Dioxide - SiO2 with iron impurities)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Amethyst (Faceted)

Amethyst (Silicon Dioxide with iron impurities, SiO2)

Slate

Slate (Foliated Metamorphic Rock)

Mica (Biotite and Muscovite) in Matrix

Potassium aluminum silicate with iron/magnesium (KAl2(AlSi3O10)(F,OH)2 / K(Mg,Fe)3AlSi3O10(F,OH)2)

Schist

Schist (various mineral compositions)

Smoky Quartz

Silicon Dioxide (SiO2) with aluminum impurities

Agate (Thunderegg segment)

Silicon dioxide (SiO2) - Microcrystalline Quartz/Chalcedony

Milky Quartz

Silicon Dioxide (SiO2)

Brachiopod Fossil in Limestone

Phylum Brachiopoda (likely Order Spiriferida), CaCO3 (Calcite)

Sandstone (Water-worn Cobble)

Arenite (variable composition, primarily SiO2)

Sandstone (River Pebble)

Arenite (primarily SiO2)

Sandstone (Ferruginous)

Arenite with Iron Oxide cement

Sandstone

Arenite (primarily SiO2)

Sandstone (River Cobble)

Clastic sedimentary rock (primarily SiO2 with various lithic fragments)

Sandstone (Flagstone)

Arenite (composed primarily of SiO2)

Sandstone (Water-worn)

Arenite

Red Sandstone (Arkose)

Clastic Sedimentary Rock (Lithic Arkose)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with Fe2O3 cement)

Fossilized Horn Coral

Order Rugosa (Rugose Coral)

Amber-bearing Coal/Sedimentary Rock

Bituminous coal or carbonaceous siltstone with Fossilized Tree Resin (C10H16O)

Quartzite River Rock

Quartzite (primarily SiO2)

Olivine in Basalt (Peridot)

Magnesium Iron Silicate (Mg, Fe)2SiO4 in Vesicular Basalt

Serpentine (Serpentinite)

Serpentinite (complex silicate group including lizardite, chrysotile, and antigorite)