Sedimentary (Man Made Conglomerate)

Sandstone

Clastic Sedimentary Rock

Yellow cabochon gemstone, likely citrine or yellow glass imitation

Quartz (SiO₂), if natural citrine; visual evidence is insufficient to exclude man-made glass or resin

Polished green-and-black banded cabochon (likely malachite imitation or dyed agate)

Uncertain; possible malachite (Cu₂CO₃(OH)₂), banded agate (SiO₂), or man-made glass

Green glass cabochon or tumbled stone

Indeterminate; likely man-made glass, possibly aventurine glass rather than a natural mineral

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

Reddish sandstone or arkose

Quartz–feldspar siliciclastic sandstone; likely iron-oxide-stained arkose

Orbicular rhyolite (orbicular jasper-like volcanic rock)

Orbicular rhyolite; predominantly quartz, alkali feldspar, plagioclase, and volcanic glass, with concentric spherulitic growths

Sandstone

Arenite

Chert

Chert (Microcrystalline Quartz)

Coquina

Bioclastic Limestone

Coquina

Bioclastic Limestone

Conglomeratic breccia (possibly polymictic volcanic breccia)

Polymictic breccia; clasts in a fine-grained volcanic or sedimentary matrix

Tumbled polymictic stone, likely jasper-bearing conglomerate

Siliciclastic conglomerate with microcrystalline quartz (jasper/chert) and altered volcanic or feldspathic clasts

Blue chalcedony cabochon (probable)

Chalcedony, a cryptocrystalline variety of quartz; silicon dioxide, SiO₂

Turquoise (likely stabilized or simulated Howlite)

CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)

Colorless faceted gemstone, likely glass or cubic zirconia

Uncertain; possible cubic zirconia (ZrO₂) or quartz (SiO₂), but the image may show a man-made simulant

Colorless faceted quartz-like gemstone

Likely quartz (SiO₂), though the appearance may also indicate man-made glass or cubic zirconia

Fossil Sea Urchin (Echinoid)

Echinoidea fossil (often replaced by silica or calcite)

Chert (Flint/Jasper variety)

Microcrystalline Quartz (SiO2)

Chert (specifically Flint Arrowhead)

Silicon dioxide (SiO2) - Microcrystalline Quartz

Coquina

Bioclastic Limestone

Sandstone (lithic wacke/conglomerate mix)

Clastic Sedimentary Rock (SiO2 with lithic fragments)

Sandstone

Arenite (with iron oxide cement)

Red Jasper (Quartzite conglomerate)

Silicon dioxide (SiO2) with Iron inclusions

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Mixed Gravel and Pebbles

Polylithic Alluvial Aggregate

River Cobble (Conglomerate context)

Unconsolidated Fluvial Alluvium (comprised of various lithologies like Quartzite, Granite, or Basalt)

Quartzite (River Pebble)

Metamorphic rock consisting primarily of Quartz (SiO2)

Mixed rock and mineral specimen collection

Mostly undetermined from the photograph; apparent quartz-rich rocks, sandstone, granite/gneiss, and possibly iron-oxide-bearing specimens

Sandstone

Arenite

Rounded sandstone cobble

Quartz-rich sandstone, likely arkosic or lithic sandstone

Weathered concrete or cementitious slab (not natural rock)

Artificial calcium-silicate cement composite; likely Portland cement concrete

Sandstone

Arenite (primarily SiO2)

Chert

Microcrystalline Quartz (SiO2)

Sandstone

Arenite

Chert (Flint)

Silicon dioxide (SiO2)

Quartz Breccia with Iron Staining

Tectonic or Sedimentary Breccia (SiO2 with Fe2O3)

Sedimentary Breccia

Breccia (Clastic Sedimentary Rock)

Weathered chert or chalcedony nodule

Microcrystalline quartz (SiO₂), possibly silicified limestone or agate-like chalcedony

Blue slag glass or dyed glass-like industrial material

Amorphous silicate glass; likely copper-bearing blue slag, but possibly colored man-made glass

Sandstone (Quartzose)

Arenite (composed primarily of SiO2)