Anthropogenic (Man Made Material Mimicking Sedimentary Rock)

Granite / Diorite (Granodiorite)

Granodiorite / Quartz Diorite

Orange glassy slag (industrial by-product)

Iron-rich silicate glass; composition varies, commonly Fe–Ca–Al silicate

Red glassy cabochon, likely synthetic ruby or red glass

Uncertain; possible synthetic corundum (Al₂O₃, chromium-colored) or man-made glass

Dyed Quartz Geode

Silicon Dioxide (SiO2) with artificial pigment

Possible yellow agate or chalcedony bead

Microcrystalline quartz (SiO₂), likely chalcedony; identification is uncertain from the photo

Chert (Flint)

Silicon Dioxide (SiO2)

Beaded gemstone bracelet

Indeterminate; likely small polished mineral beads, possibly turquoise or dyed stone, with metal and glass components

Sandstone

Arenite (SiO2 based typically)

Coquina

Coquina (Bioclastic Limestone)

Flint (gray chert)

Microcrystalline quartz (SiO₂), a variety of chert

Chert (flint) fragment

Microcrystalline quartz (SiO₂), commonly called chert or flint

Sandstone (likely Quartzose)

Clastic sedimentary rock (SiO2 primary)

Tumbled chert or jasper pebble

Microcrystalline quartz (SiO₂), likely chert/jasper

Jasper

Microcrystalline Quartz (SiO2)

Chert (Cherty Shale / Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Likely slate

Slate, a fine-grained metamorphic rock composed mainly of mica-group minerals and quartz

Chert (Flint)

Chert (Microcrystalline Quartz, SiO2)

Brown chert (flint)

Microcrystalline quartz (SiO₂), commonly called chert; “flint” is a dark variety

Likely flint (chert) fragment

Chert, microcrystalline quartz (SiO₂)

Polished orbicular granite heart

Granite, commonly quartz–alkali feldspar–plagioclase–biotite granite; exact locality-dependent

Polished brecciated jasper pendant

Jasper, an opaque microcrystalline variety of chalcedony (mostly SiO₂), with iron-oxide staining and likely brecciation

Tiger Shark Fossil Tooth

Galeocerdo cuvier (fossilized)

Chert (Grey-Green Flint)

Microcrystalline silicon dioxide (SiO2)

Chert

Sedimentary cryptocrystalline silica (SiO2)

Carnelian cabochon pendant

Carnelian, orange-red chalcedony (microcrystalline quartz, SiO₂)

Cullet Glass (Man-made Glass Slag)

Amorphous Silica (SiO2) with chemical additives

Probable amber fragment

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

Chert (specifically Flint or Common Chert node)

Silicon Dioxide (SiO2)

Red jasper (likely)

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored red by iron oxides

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

Quartzite

Metamorphic quartz rock (SiO2)

Tumbled yellow jasper or chalcedony

Microcrystalline quartz, SiO₂; likely iron-oxide-bearing jasper/chalcedony

Chert (Nodular or Massive Variety)

Cryptocrystalline Quartz (SiO2)

Grooved Maun Ball (Maul/Hammerstone-like Concretion)

Calcareous/Ferruginous Concretion in Sandstone Matrix

Asphalt

Asphalt concrete (engineered material, not a naturally occurring rock/mineral in this form)

Tumbled opalite (likely synthetic glass)

Opalite; typically man-made opalescent soda-lime glass, not a recognized mineral species

Chert (Flint)

Silicon Dioxide (SiO2)

Chert (Flint/Jasper variety)

Microcrystalline Quartz (SiO2)

Red coral chip bracelet

Corallium spp.; skeleton composed primarily of calcium carbonate (aragonite)

Mixed polished gemstone and mineral collection

Primarily quartz varieties (SiO₂), plus probable aventurine, rose quartz, amethyst, agate, jasper, serpentine, feldspar, and possibly dyed or man-made glass pieces

Blue goldstone

Man-made aventurine glass containing metallic copper particles; not a natural mineral

Likely polished quartz or glass-like mineral cabochon

Probably quartz (SiO₂), though the image cannot exclude man-made glass