Anthropogenic Sedimentary (Man Made)

Chert (Flint / Quartz Nodule)

Microcrystalline Quartz (SiO2)

Granite Pebble

Granite (Phaneritic intrusive igneous rock comprising Quartz, Feldspar, and Mica)

Limestone Pebble

Sedimentary Calcium Carbonate (CaCO3)

Sandstone (with potential Arkose/Lithic characteristics)

Arenite (Sedimentary rock composed of sand-sized grains)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone (Ferruginous)

Arenite (SiO2 with Fe2O3 inclusions)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone (likely Quartzose)

Clastic sedimentary rock (SiO2 primary)

Fossil Coral

Scleractinia (Stony Coral) fossil

Chert (Flint / Jasper)

Silicon Dioxide (SiO2)

Chert (Cherty Shale / Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Cobalt Blue Slag Glass

Amorphous Silicon Dioxide (anthropogenic) with Cobalt additives

Sandstone

Arenite (composed primarily of SiO2)

Sandstone

Arenite (variable SiO2 composition)

Chert (specifically Tan/Gray Chert)

Microcrystalline quartz (SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Siltstone Pebble

Siltstone (composed of microscopic quartz and clay minerals)

Granodiorite

Granodiorite

Chert

Silicon dioxide (SiO2)

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Coquina

Biogenic Limestone (Coquina)

Diamond (in a jewelry setting)

Diamond (Carbon, C)

Chert / Flint

Silicon Dioxide (SiO2)

Chert or Jasper

Microcrystalline Quartz (SiO2)

Chert (Yellow Jasper/Flint)

Silicon Dioxide (SiO2)

Chert (Flint)

Silicon Dioxide (SiO2)

Chert (Flint)

Silicon Dioxide (SiO2)

Probable amber fragment

Amber (fossilized plant resin; chiefly amorphous organic resin, commonly dominated by succinite)

Sandstone (Pebble)

Sandstone (SiO2 with matrix/cement)

Sandstone

Arenite (SiO2 based typically)

Chalk

Micrite (primarily Calcium Carbonate or CaCO3)

Polished blue-green glassy slag or coated mineral fragment

Most likely man-made colored glass/slag; exact composition cannot be determined visually

Blue goldstone beads

Man-made aventurine glass (silica glass with metallic copper inclusions), not natural lapis lazuli

Quartzite Arrowhead (Archaeological Lithic)

Recrystallized Quartz (SiO2)

Goldstone

N/A (Synthetic Glass with Copper Inclusions)

Chert (Siltstone / Flint)

SiO2 (Cryptocrystalline Quartz)

Chert (Chalcedony/Agate variety)

Silicon Dioxide (SiO2)

Chert (with Quartz)

Microcrystalline Quartz (SiO2)

Sandstone

Arenite (SiO2 composition dominant)

Sandstone

Clastic sedimentary rock (Quartz arenite/Arkose)

Sandstone

Arenite (primarily SiO2)

Sandstone (Ferruginous)

Arenite with Iron Oxide cement (primarily SiO2 with Fe2O3)