Sedimentary Rock (Specifically A Concretion Or Possibly A Geode)

Leopard Skin Jasper

Silicon Dioxide (SiO2) with impurities

Montana Moss Agate

Chalcedony (SiO2) with Manganese/Iron oxide inclusions

Quartz Geode (Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Geode with Iron-Stained Quartz/Calcite

Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) in Sedimentary Matrix

Ironstone Concretion / Limonite Node

Ferruginous Sedimentary Rock (composed primarily of Limonite FeO(OH)·nH2O and Goethite)

Banded Gneiss

Gneiss (typically quartz, feldspar, mica, amphibole composition)

Quartz Geode (Cracked Open Fragment)

Silicon Dioxide (SiO2)

Puddingstone (specifically Michigan/Gowganda Puddingstone)

Conglomerate (Jasper Conglomerate)

Citrine Geode

Citrine (Silicon Dioxide, SiO2)

Banded Chert (Jasper)

Silicon Dioxide (SiO2)

Sandstone (likely Greywacke or Siltstone variety)

Arenite / Siltstone (primarily SiO2)

Sandstone (Red Flagstone)

Clastic sedimentary rock (primarily Quartz - SiO2)

River Pebble (Gravel)

Clastic sedimentary rock (likely Siltstone or Mudstone pebble; SiO2 with various impurities)

Chert (Flint Nobule)

Silicon Dioxide (SiO2)

Quartz Geode

Crystalline Quartz (Silicon Dioxide, SiO2)

Dragon Stone

Argillaceous Sedimentary Rock (Ohko Stone)

Ocean Jasper

Orbicular Jasper (Silicon Dioxide, SiO2)

Dendritic Agate (specifically Orange/Tumbled)

Silicon Dioxide (SiO2) with Oxide Inclusions

Chert (Chalk-associated Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartz Druzy (on Calcedony/Quartz base)

Silicon Dioxide (SiO2)

Jasper or Chert

Silicon Dioxide (SiO2)

Chert (Jasper/Chalcedony)

Microcrystalline Silica (SiO2)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Chert (Iron-stained)

Chert (Silicon Dioxide, SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Jasper Conglomerate (specifically Puddingstone)

Jasper Conglomerate (Siliceous sedimentary rock)

Red Jasper (Brecciated or Mottled)

Silicon Dioxide (SiO2) with iron oxide inclusions

Quartz Druzy Geode Fragment

Silicon Dioxide (SiO2)

Limestone (Concretionary or Tufa)

Calcium Carbonate (CaCO3)

Sandstone Concretion

Moqui Marble (Iron-oxide concretion)

Ironstone Concretion

Siderite or Hematite-bonded Concretion

Quartz (specifically Milky or Clear Quartz fragment)

Silicon Dioxide (SiO2)

Chert (specifically Gray Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Geode (Unopened)

Crystalline Quartz Geode (SiO2)

Schist with Biotite Inclusion

Biotite-bearing Mica Schist (K(Mg,Fe)3AlSi3O10(F,OH)2)

Dalmatian Stone

Dalmatian Jasper (Aphanitic Igneous Rock with Arfvedsonite inclusions)

Basalt

Basalt (Mafic volcanic rock)

Limestone (specifically Fossiliferous Limestone)

Calcium Carbonate (CaCO3)

Quartz Geode

Crystalline Silicon Dioxide (SiO2) in a Geodic structure

Sandstone

Clastic sedimentary rock (primarily SiO2)

Red Jasper

Jasper (SiO2) with Hematite (Fe2O3) inclusions

Chert (specifically Yellow Jasper)

Sedimentary Cryptocrystalline Quartz (SiO2)