Organic (If Resin) Or Synthetic (If Glass); Simulating Sedimentary Or Metamorphic (For Natural Stones)

Amethyst Quartz (Tumbled)

Amethyst (Silicon Dioxide with iron impurities, SiO2)

Quartz Geode (Cracked)

Quartz (Silicon Dioxide, SiO2)

Orange Quartzite / Quartz

Silicon Dioxide (SiO2) with iron oxide inclusions

Howlite

Howlite (Calcium borosilicate hydroxide, Ca2B5SiO9(OH)5)

Sandstone (Greywacke/Siltstone variant)

Clastic Sedimentary Rock (composed primarily of Quartz SiO2 and Feldspar)

Quartzite River Rock

Quartzite (primarily SiO2)

Limonitic Iron Ore / Goethite

Hydrated Iron(III) oxide-hydroxide (primarily FeO(OH)·nH2O)

Magnetite / Iron-Rich Concretion

Magnetite (Fe3O4) or Bog Iron Limonite

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with Fe2O3 staining)

Brachiopod Fossil (Spiriferid)

Order Spiriferida (Phylum Brachiopoda); mineralized as Calcite (CaCO3) or Chert (SiO2)

Quartzite Pebble

Quartzite (primarily SiO2)

Rough Garnet in Matrix

Almandine Garnet (Fe3Al2Si3O12)

Sandstone

Arenite (primarily SiO2 - Silicon Dioxide)

Sandstone

Arenite (primarily SiO2)

Yellow Chalcedony (Jasper/Chert Pebble)

Silicon Dioxide (SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Sandstone (Ferruginous)

Arenite (Fe-bearing Clastic Sedimentary Rock)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily Quartz with Hematite/Limonite oxides)

Banded Chert

Microcrystalline Quartz (SiO2)

Yellow Quartzite (River Pebble)

Quartzite (mainly SiO2)

Sandstone (likely Quartzose Sandstone)

Arenite (composed primarily of SiO2)

Pyrite

Iron Sulfide (FeS2)

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz, SiO2)

Yellow Calcite

Calcium Carbonate (CaCO3)

Smoky Quartz

Silicon Dioxide (SiO2)

Quartzite Pebble

Quartzite (mostly SiO2)

Sandstone (with Iron concretions/staining)

Arenite (composed primarily of Quartz and Feldspar with Iron Oxide cement)

Amethyst

Amethyst (Silicon Dioxide, SiO2)

Dyed Agate

Silicon Dioxide (SiO2) - Variety Agate / Chalcedony

Chert (Tan/Yellow variety)

Microcrystalline Quartz (SiO2)

Conglomerate

Conglomerative Sedimentary Rock

Sandstone (likely Arkosic or Lithic Sandstone)

Clastic Sedimentary Rock (SiO2 with assorted minerals)

Sandstone Concretion with Fossil Wood

Ferruginous Sandstone Concretion (SiO2 with Fe2O3 cement)

Chert / Flint

Microcrystalline Quartz (SiO2)

Blue Chalcedony (likely dyed)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

River Stone (likely Quartzite or Chert)

Recrystallized Silicon Dioxide (SiO2)

Sandstone (likely Ferruginous)

Sandstone (SiO2 with iron oxides)

Conglomerate

Conglomerate (clastic sedimentary rock)

Jasper (Iron-stained)

Silicon Dioxide (SiO2) with iron oxide inclusions

Sandstone (Quartzose)

Arenite (primarily SiO2)

Orange Calcite

Calcite (Calcium Carbonate - CaCO3)

Rough Corundum (likely Sapphire/Zircon-bearing)

Aluminium Oxide (Al2O3)