Metamorphic (Likely Gneiss Or Schist Based On Texture)

Quartzite

Metamorphosed Sandstone (SiO2)

Yellow Quartzite (River Pebble)

Quartzite (SiO2)

Dendritic Agate or Spotted Quartzite

Silicon Dioxide (SiO2) with inclusions

Marble

Recrystallized Calcite (CaCO3)

Quartzite with Quartz Veining

Quartzite (primarily SiO2)

Basalt (River Pebble)

Basalt (Mafic Extrusive Igneous Rock)

Limestone

Calcium Carbonate (CaCO3)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) in matrix

Epidosite

Epidosite (predominantly Epidote {Ca2Al2Fe3+Si3O12(OH)} and Quartz {SiO2})

Granodiorite

Granodiorite (Quartz-Feldspar-Biotite Plutonic Rock)

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Basalt

Mafic Igneous Rock (composed primarily of Pyroxene and Plagioclase Feldspar)

Shale

Shale (Consolidated fine-grained clay/silt)

Basalt with Vesicular Surface

Basalt (Mafic Extrusive)

Basalt (Water-worn pebble)

Basalt (Mafic Extrusive Rock)

Blue Quartzite (Blue Aventurine / Dumortierite Quartz)

Quartzite with inclusions (SiO2 with AlAl4BSi3O18)

Quartzite pebble

Metamorphic Quartzite (primarily SiO2)

Jadeite Jade

NaAlSi2O6 (Sodium Aluminum Silicate)

Chert (River Stone/Pebble)

Chert (SiO2)

Marble

Recrystallized Calcite / Dolomite (CaCO3)

Basalt

Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Basalt River Stone

Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Chert (Brecciated River Cobble)

Silicon Dioxide (SiO2)

Basalt

Mafic volcanic rock (formula varies by mineral content: Ca-plagioclase, Pyroxene, Olivine)

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Pink Granite

Phaneritic intrusive felsic igneous rock

Fuchsite Quartzite

Fuchsite-bearing Quartzite

Coquina Limestone (Fossiliferous Limestone)

Calcareous bioclastic sedimentary rock (CaCO3)

Basalt (Vesicular/Scoriaceous)

Extrusive Mafic Volcanic Rock (Primarily Plagioclase Feldspar and Pyroxene)

Yellow Quartzite Pebble

Quartzite (SiO2)

Basalt (Weathered)

Extrusive mafic volcanic rock

Basalt

Basalt (Mafic volcanic rock)

Basalt

Mafic extrusive igneous rock

Basalt (with possible Olivine inclusions)

Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

Green Aventurine

Silicon Dioxide (Quartz variety) with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Nuummite

Orthorhombic amphibole (Gedrite and Anthophyllite mixture) - (Mg,Fe)7Si8O22(OH)2

Geode with Iron-Stained Quartz/Calcite

Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) in Sedimentary Matrix

Quartzite

Quartzite (SiO2)

Red Quartzite

Quartzite (primarily SiO2 with hematite inclusions)

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (primarily SiO2)