Man Made Composite (Lithified Equivalent Of Sedimentary)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3/FeO(OH) cementing agents)

Shale

Shale (clay-sized silicate minerals)

Feldspar (specifically Orthoclase or Plagioclase)

Potassium Aluminum Silicate (KAlSi3O8) or Sodium/Calcium Aluminum Silicate

Chert (Basanite / Jasperoid)

Microcrystalline Quartz (SiO2)

Sandstone

Arenite (composed primarily of Quartz: SiO2)

Sandstone (Ferruginous)

Arenite (with Goethite/Limonite cement)

Sandstone

Arenite (primarily SiO2)

Sandstone (Quartz Sandstone / Iron-stained Sandstone)

Sandstone (SiO2 with iron oxide impurities)

Sandstone (Weathered)

Arenite (primarily SiO2)

Red Mudstone (Siltstone)

Lutite (primarily Quartz and Clay minerals with Hematite)

Quartz

Silicon Dioxide (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Chalcedony in Matrix (likely Agatized Coral or Chert)

Silicon Dioxide (SiO2)

Polished banded agate slab or agate-look decorative stone

Microcrystalline quartz (chalcedony), SiO₂; exact identification is uncertain from the image

Limestone

Calcium Carbonate (CaCO3)

Sandstone (with Manganese staining)

Arenite (composed primarily of SiO2)

Limestone

Calcium Carbonate (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Polished tiger iron

Tiger iron; interlayered hematite, jasper, and crocidolite-quartz (often riebeckite)

Granite

Intrusive Igneous Rock

Sandstone

Arenite

Limestone

Calcium Carbonate (CaCO3)

Seashell (Cockle Shell)

Cardiidae (Bivalvia), primary composition: Calcium Carbonate (CaCO3) in the form of aragonite or calcite

Limestone with Lichen/Algae

Sedimentary Calcium Carbonate (CaCO3)

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Red Jasper

Silicon Dioxide (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Sandstone

Arenite

Green cabochon gemstone, likely aventurine or dyed chalcedony

Indeterminate from image; possible quartz variety (SiO₂), including aventurine quartz or chalcedony

Limestone (specifically fossiliferous/skeletal limestone)

Calcium Carbonate (CaCO3)

Sandstone (Quartzose)

Arenite (SiO2 principal)

Sandstone

Arenite (Sedimentary rock composed of sand-sized minerals or rock grains)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Limonite pseudo-concretion (Ironstone)

Limonite (FeO(OH)·nH2O) / Goethite

Red Sandstone

Arenite (primarily Quartz with Hematite cement)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 oxides)

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 oxides)

Limestone

Calcium Carbonate (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Limestone

Calcium Carbonate (CaCO3)