Antropogenic (Man Made Material)

Sandstone (Ferruginous)

Arenite (with iron oxide cement, Fe2O3)

Yellow Jasper

Silicon Dioxide with iron inclusions (SiO2)

Chert (Flint)

Cryptocrystalline Silica (SiO2)

Banded Iron Formation (Jaspillite)

Banded Iron Formation (BIF) / Jaspillite

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Satin Spar Selenite

Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)

Sandstone

Clastic Sedimentary Rock (primarily SiO2)

River Stone / Siltstone

Siltstone (composed of lithified silt)

Chert (Jasper/Ironstone variety)

Silicon Dioxide (SiO2) with iron oxide inclusions

Fossiliferous Limestone (Coquina / Shell Conglomerate)

Bioclastic Limestone (composed primarily of CaCO3)

Diorite (River Cobble)

Intrusive Igneous Diorite

River Cobble (Quartzite and Iron-stained Quartz)

Quartzite (SiO2 with iron oxide impurities)

Sandstone (Ferruginous)

Ferruginous Sandstone (SiO2 with Fe2O3/FeO(OH) cement)

Granite

Phaneritic Felsic Igneous Rock (primarily Quartz, Alkali Feldspar, and Plagioclase)

Basalt (River Pebble)

Basalt

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Milky Quartz (Water-worn pebble)

Quartz (Silicon Dioxide, SiO2)

Sandstone

Arenite (primarily SiO2 with various cementing agents)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Sandstone (likely Quartzose)

Arenite (primarily SiO2)

Amazonite

Microcline (K(AlSi3O8))

Jasper

Silicon dioxide (SiO2) with impurities

Red Sandstone

Arenite (Fe2O3-rich)

Quartz with Iron Staining

Silicon Dioxide (SiO2) with Hematite inclusions

Labradorite

Labradorite ((Ca, Na)(Al, Si)4O8)

Chlorastrolite (Isle Royale Greenstone)

Chlorastrolite (Pumpellyite-(Mg,Fe2+): Ca2MgAl2(Si2O7)(SiO4)(OH)2∙H2O)

Rhodonite

Rhodonite (MnSiO3)

Chert (often referred to as 'Jasper' when red)

Chert (microcrystalline quartz, SiO₂)

Bivalve Fossil (Clam/Mollusk)

Class: Bivalvia (Order: Veneroida), Calcium Carbonate (CaCO3)

Chert (Gravel pebble)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Snakeskin Agate

Agate (Cryptocrystalline Quartz, SiO2)

Snowflake Obsidian

Volcanic glass containing Spherulitic Cristobalite (SiO2)

Moss Agate

Silicon Dioxide (SiO2) with Manganese or Iron Oxide inclusions

Obsidian

Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)

River Stone (River Pebbles)

Alluvial Deposit (typically Quartzite, Sandstone, or Granite clasts)

Fossilized Bone Fragment

Permineralized Vertebrate Fossil (Hydroxyapatite replaced by Minerals)

Fossil Coral (Rugose Coral Fragment)

Rugosa (extinct order of solitary and colonial corals)

Rough Diamond

Diamond (C)

Chert / Flint

Cryptocrystalline Quartz (SiO2)

Rose Quartz with Schist Matrix

Silicon Dioxide (SiO2) with Mica-Schist

Quartzite (River Cobble)

Metamorphosed Quartz Sandstone (SiO2)

Rose Quartz (likely carved)

Rose Quartz (SiO2)