Anthropogenic (Man Made Material Mimicking Sedimentary Rock)

Likely clear quartz crystal (possibly cut/polished quartz or glass imitation)

Quartz, silicon dioxide (SiO₂)

Coquina

Biogenic Limestone (mostly Calcium Carbonate, CaCO3)

Green Slag Glass

Cullet (Amorphous Silicon Dioxide with impurities)

Clay (as a rock-forming material)

Clay minerals (e.g., Kaolinite group, Smectite group, Illite group, Chlorite group)

Chert (Flint / Quartz Nodule)

Microcrystalline Quartz (SiO2)

Tumbled brown chalcedony or jasper

Microcrystalline quartz, SiO₂; possibly iron-bearing jasper

Greenstone pebble

Greenstone (metamorphosed mafic rock, commonly altered basalt); exact identification requires testing

Chert (Flint)

Silicon Dioxide (SiO2)

Chert

Chert (SiO2)

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Likely tumbled epidote-bearing rock or green jasper

Epidote-group silicate, possibly in a jasper or serpentinite matrix

Pink Granite

Phaneritic Felsic Igneous Rock (composed of orthoclase, quartz, and plagioclase)

Belemnoit (Fossil)

Belemnoidea (Order), Rostrum / Guard

Turquoise cabochon ring

Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O

Amber-set ring

Amber (fossilized plant resin; organic mineraloid), set in a metal ring

Polished blue calcite sphere (tentative identification)

Calcite, CaCO₃; blue color generally results from trace impurities or inclusions

Siltstone Pebble

Siltstone (composed of microscopic quartz and clay minerals)

Pumice or vesicular volcanic tuff

Pumice: highly vesicular volcanic glass, chiefly rhyolitic to dacitic; possible tuff: lithified ash and pumice fragments

Chert (flint), possibly a fossil-bearing nodule

Microcrystalline quartz (SiO₂), variety chert

Chert

Microcrystalline silica (SiO2)

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

Brown chert (flint)

Microcrystalline quartz (SiO₂), varieties called chert or flint

White Marble

Recrystallized Calcite (CaCO3)

Goldstone (Synthetic Aventurescence Glass)

Cuprous Aventurescent Glass (Silicon Dioxide with Copper inclusions)

Sandstone

Arenite (composed primarily of Quartz: SiO2)

Possible basalt or iron-rich slag

Basalt (tentative; identification uncertain from image)

Blue chalcedony cabochon (probable)

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

Chert (Honey Chert / Flint)

Silicon Dioxide (SiO2)

Chert (Flint)

Chert (Silicon Dioxide, SiO2)

Chert (Jasper/Flint)

Silicon Dioxide (SiO2)

Flint / Chert Pebble

Microcrystalline Quartz (SiO2)

Unakite

Altered Granite (Epidotized Granite)

Faceted glass-like gemstone object

Likely synthetic glass or cubic zirconia; exact material cannot be confirmed from the image

Tumbled brown chalcedony or agate

Microcrystalline quartz (SiO₂), likely chalcedony; possibly iron-stained jasper or agate

Polished blue-green jasper beads

Jasper, an opaque microcrystalline variety of quartz (SiO₂)

Chert (Chert / Flint Variety)

Microcrystalline / Cryptocrystalline Quartz (SiO2)

Tumbled epidote-bearing rock (likely epidote–quartz–feldspar aggregate)

Epidote-rich metamorphic rock; minerals likely epidote (Ca₂(Al,Fe)₃Si₃O₁₂(OH), quartz, feldspar, and dark amphibole/biotite)

Sandstone

Clastic Sedimentary Rock

Sea Glass (Frosted Glass)

Amorphous Silica (SiO2) with various additives

Sea Glass (Kelly Green)

Amorphous Silica (Silicon Dioxide with Iron/Chromium additives)

Likely river-worn chert (flint) pebble

Microcrystalline quartz (SiO₂), commonly called chert or flint

Goldstone (blue/black aventurine glass)

Man-made aventurine glass; silica glass containing metallic copper or other glittering inclusions