Sedimentary Rock (Possibly Composed Of Various Minerals)

Ironstone (likely siderite or goethite-rich siltstone)

Ferruginous Siltstone

Sandstone with Iron Concretion

Arenite with Limonite/Goethite Concretion

Calcite

Calcite (CaCO 3)

River Rocks (Basalt and Sedimentary Stones)

Mafic Igneous Rock (Basalt) and Clastic Sedimentary Rock

Sandstone

Arenite (primarily composed of SiO2)

Conglomerate

Conglomerate (clastic sedimentary rock)

Iron Ore / Ironstone Concretion

Mixture of iron oxide/hydroxide minerals, likely some combination of Hematite (Fe2O3), Goethite (α-FeOOH), and Limonite (a general term for hydrated iron oxides of variable composition) or potentially Bauxite (a mixture of aluminum hydroxides, often with iron oxides, (Al(OH)3) and FeO(OH)). The visual characteristics strongly suggest iron-rich material.

Shale

Fissile mudstone (rich in clay minerals and quartz)

Conglomerate

Conglomerate (clastic sedimentary rock)

Banded Iron Formation

Banded Iron Formation (BIF)

Schist (with Iron Oxide)

Mica Schist

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Sandstone, Quartzite, and River Pebbles

Silicon Dioxide (SiO2) based Sedimentary/Metamorphic structures

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Yellow Jasper

Cryptocrystalline quartz (SiO2) with iron inclusions

Snowflake Obsidian

Volcanic Glass with Cristobalite inclusions (70–75% SiO2)

Polygenetic Breccia

Clastic Breccia (containing lithic fragments in a fine-grained matrix)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Petrified Wood

Silicified Wood (primarily SiO2)

Green Jasper

Silicon Dioxide (SiO2) with iron silicate inclusions

Gneiss

Gneiss (High-grade metamorphic rock)

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrated Iron Oxide)

Sandstone Geode (Unbroken)

Siliciclastic sedimentary rock (primarily Quartz)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2)

Cockle Shell (Fossil or Recent)

Class Bivalvia, Family Cardiidae (e.g., Cerastoderma edule for common cockle)

Bituminous Coal

Organic Sedimentary Rock (composed mostly of carbon with sulfur and hydrogen)

Chert (specifically Green Chert/Jasper)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Jasper

Silicon dioxide (SiO2)

Granite Gneiss

Gneiss (High-grade regional metamorphic rock)

Ferruginous Sandstone (Ironstone)

Arenite with Limonite/Goethite cement

Clear Quartz Cluster

Silicon Dioxide (SiO2)

Gneiss

Gneiss (High-grade metamorphic rock)

Geode (unopened)

Chert / Chalcedony Geode (SiO2)

Conglomerate (or Breccia)

Clastic Sedimentary Rock (Conglomeratic)

Serpentinite

Serpentinite (containing minerals of the Serpentine subgroup: Antigorite, Lizardite, and Chrysotile; formula (Mg,Fe)3Si2O5(OH)4)

Raw Diamond

Carbon (C)

Yellow Aventurine

Quartz (Silicon Dioxide) with Mica inclusions (SiO2)

Shale or Argillite

Shale (sedimentary) / Argillite (metamorphic)

Granite

Granite (a common name for a felsic intrusive igneous rock)

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz, SiO2)

Sandstone (Ferruginous)

Arenite with Iron Oxide cement

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)