Igneous And Sedimentary

Dalmatian Stone

Dalmatian Stone (a fine-grained igneous rock, often misidentified as Dalmatian Jasper)

Grey Granite

Phaneritic Felsic Intrusive Igneous Rock

Granite

Granite (Felsic Plutonic Rock)

Granite (Weathered River Rock)

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

Diorite (or salt-and-pepper granite pebble)

Phaneritic Igneous Rock (Intermediate Composition)

Magnetite (or Magnetic Iron Ore)

Magnetite (Fe3O4)

Granite

Granite

Granite (with Almandine Garnet inclusions)

Granite composed primarily of Quartz (SiO2), K-Feldspar (KAlSi3O8), and Almandine Garnet (Fe3Al2(SiO4)3)

Granite

Granite (High-silica plutonic rock)

Dolerite (Diabase)

Dolerite / Diabase

Granite

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

Diorite (River Cobble)

Phaneritic Intermediate Plutonic Rock

Labradorite

Feldspar (variety of Anorthite), (Ca,Na)(Al,Si)4O8

Jasper (specifically Polychrome or Desert Jasper)

Silicon Dioxide (SiO2) with impurities

Granite (likely a river or beach pebble)

Granite (a felsic intrusive igneous rock primarily composed of quartz, feldspar, and mica)

Sodalite

Sodalite: Na8(Al6Si6O24)Cl2

Granite

Phaneritic Felsic Igneous Rock

Shale

Shale (clastic sedimentary rock)

Shale with Trace Fossils

Fissile mudrock (Shale)

Sandstone

Arenite

Shale

Shale (Lutite)

Shale

Fissile mudstone (rich in clay minerals and quartz)

Shale

Fissile mudrock (composed primarily of clay minerals and quartz)

Peridotite

Peridotite (Ultramafic Rock)

Fossil Coral

Tabulate Coral (potentially Favosites or Calapoecia)

Gastropod Steinkern (Internal Mold Fossil)

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

Granite

Granite (Felsic Plutonic Rock)

Mahogany Obsidian

Obsidian (Volcanic Glass) with Hematite/Magnetite inclusions

Granite

Granite (Felsic Plutonic Rock)

Arfvedsonite in Quartz (also known as Eudialyte/Garnet Syenite variety)

Arfvedsonite [Na3(Fe2+)4Fe3+Si8O22(OH)2] within a silicate matrix

Porphyritic Basalt (likely Chinese Writing Stone)

Porphyritic Basalt / Plagioclase Feldspar in Basal Matrix

Granite

Granite (Phaneritic Quartz-Feldspar Plutonic Rock)

Olivine Diabase Porphyry

Porphyritic Olivine-Bearing Diabase (Micro-Gabbro)

Granite Cobble

Granite (Felsic Intrusive)

Chinese Writing Stone

Porphyritic Basalt (with Andalusite/Feldspar phenocrysts)

Olivine (Peridotite)

(Mg,Fe)2SiO4 (Magnesium Iron Silicate)

Granite

Granite (Felsic intrusive igneous rock)

Labradorite (Larvikite variety)

(Na,Ca)(Al,Si)4O8 (Plagioclase Feldspar)

Snowflake Obsidian

Volcanic glass containing Spherulite inclusions (primarily Cristobalite, SiO2)

Granite

Granite (Phaneritic intrusive igneous rock)

Granite

Granite

Sandstone

Arenite (SiO2 primarily)