Anthropogenic (Man Made Material Mimicking Sedimentary Rock)

Lapis lazuli and green-blue chalcedony jewelry

Lapis lazuli: lazurite-bearing metamorphic rock, chiefly lazurite (Na₃Ca(Al₃Si₃O₁₂)S) with calcite and pyrite; second stone: likely chrysoprase or green-blue chalcedony (microcrystalline quartz, SiO₂)

Chert (and Jasper/Chalcedony mixture)

Microcrystalline Quartz (SiO2)

Coquina

Biogenic Limestone (CaCO3)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Chert

Microcrystalline Quartz (SiO2)

Chert (often called Flint)

Microcrystalline Quartz (SiO2)

Coquina

Bioclastic Limestone (composed primarily of CaCO3)

Red Sandstone

Arenite (Ferruginous Sandstone)

Chert

Microcrystalline quartz (SiO2)

Granite

Granite (felsic intrusive igneous rock)

Red jasper-like chalcedony pebble

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper

Flint / Chert

Microcrystalline Quartz (SiO2)

Painted Sandstone

Sandstone (clastic sedimentary rock) with acrylic/artistic coating

Chert

Microcrystalline quartz (SiO2)

Sandstone

Arenite (primarily SiO2)

Chert / Green Jasper

Silicon Dioxide (SiO2)

Sandstone (with potential fossil fragments)

Sandstone (SiO2 dominated with iron oxides)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Fossilized Shark Tooth

Carcharocles sp. or Striatolamia sp. (Phosphate/Carbonate mineralized Hydroxyapatite)

Sandstone

Arenite (Sedimentary rock comprising sand-sized grains)

Cardstock (Paper)

Cellulose (C6H10O5)n

Blue Goldstone

Aventurine Glass (SiO2 with Cobalt/Copper inclusions)

Chert (or Flint)

Chert (a cryptocrystalline variety of quartz, SiO2)

Shale

Argillite / Shaly Mudstone

Chert (Flinty variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Sandstone

Arenite (SiO2 based)

Sedimentary Rock with Crafts (Pet Rock)

Sedimentary rock decorated with synthetic materials

Coquina

Bioclastic Limestone

Chert (variations include Flint/Novaculite)

Chert (formula: SiO2)

Chert (often called Flint for darker varieties)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Sandstone (Tumbled / Rounded)

Sedimentary Rock (Quartz arenite)

Sandstone (lithic wacke/conglomerate mix)

Clastic Sedimentary Rock (SiO2 with lithic fragments)

Sandstone

Sedimentary Rock (Quartz arenite)

Crinoid Fossil in Limestone

Crinoid columnal (Class Crinoidea) in biomicrite

Sandstone (Micaceous)

Clastic Sedimentary Rock - Micaceous Litharenite (SiO2 principal)

Chert / Jasper

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite with Iron Oxide matrix

Chert (Nodule)

Chert (SiO2)

Chert (and Flint)

Silicon Dioxide (SiO2)

Sandstone

Sedimentary Clastic Rock (Quartzose Sandstone)

Chert (Jasper type)

Microcrystalline Quartz (SiO2)