Sedimentary Rock (Altered)

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Ferruginous Chert

Microcrystalline Quartz (SiO2) with Iron Oxides

Jasper Agate (specifically Brecciated Jasper with Agate inclusions)

Silicon Dioxide (SiO2)

Quartz (Milky or Clear variety)

Silicon Dioxide (SiO2)

Ironstone Concretion / Limonite-stained Siltstone

Ironstone (primarily Limonite FeO(OH)·nH2O and Siltstone)

Chert (variously identified as Flint)

Microcrystalline Quartz (SiO2)

River Pebble (Greywacke or Quartzite-rich Sandstone)

Lithic Sandstone (primarily SiO2 with rock fragments)

Wonderstone (Sandstone)

Liesegang Banded Sandstone (SiO2 dominated)

Sandstone (Red/Brown Variety)

Arenite (composed primarily of SiO2 with Fe2O3 iron oxide inclusions)

Greenstone (Greywacke or Nephrite Jade variant)

Metamorphosed mafic igneous or sedimentary rock (e.g., Actinolite-Chlorite Schist)

Fossilized Brachiopod/Bivalve in Limestone

Brachiopoda or Bivalvia fossil in Calcite/Limestone (CaCO3)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Ferruginous Sandstone (with ripple marks)

Arenite with Iron-Oxide (Fe2O3) cement

Turquoise

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]

Milky Quartz (Druzy Geode fragment)

Silicon Dioxide (SiO2)

Foliated Gneiss (River-Worn Pebble)

Gneiss (High-grade Regional Metamorphic Rock)

Milky Quartz (Crystal Cluster)

Silicon Dioxide (SiO2) - Quartz Variety

Turquoise

Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O

Quartz Geode

Silicon Dioxide (SiO2) in a Secondary Sedimentary/Volcanic cavity

Turquoise

Turquoise (CuAl6(PO4)4(OH)8·4H2O)

Yellow Agate

Chalcedony (cryptocrystalline Quartz), SiO2

Chalcedony (Agate)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Banded Iron Formation

Banded Iron Formation (BIF)

Jasper (Iron-stained Quartz)

Silicon dioxide (SiO2) with iron oxide inclusions

Quartz (chalcedony variety) or Limestone with Quartz Veins

SiO2 (for Quartz/Chalcedony); CaCO3 (for Limestone)

Lava Stone and Chakra Beads

Basalt (with various mineral/synthetic beads)

Quartz (likely a form of massive or vein quartz)

Quartz (SiO₂)

Graywacke (Sandstone)

Graywacke Sandstone

Bauxite

Bauxite (Mixture of Al(OH)3, AlO(OH), and Fe2O3)

Chert (Yellow or Ochre Jasper variant)

Microcrystalline Quartz (SiO2)

Jasper (Red Jasper with Quartz veins)

Jasper (Silicon Dioxide, SiO2)

Red Jasper

Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)

Chert (Jasper-bearing)

Chert (Silicon Dioxide, SiO2)

Chert (Iron-stained)

Chert (SiO2)

Chert (Brecciated or Veined)

Silicon Dioxide (SiO2)

Chert (Iron-rich or Jasperoid)

Cryptocrystalline Quartz (SiO2)

Petoskey Stone

Hexagonaria percarinata (Fossilized Rugose Coral)

Septarian Nodule (Septarian Dragon Stone)

Septarian Concretion (CaCO3 + Al2Si2O5(OH)4)

Coquina (Fossiliferous Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Fossiliferous Limestone (Coquina / Shell Limestone)

Biogenic Limestone (CaCO3)

Ammonite Fossil (Polished Half)

Ammonoidea (subclass)

Lapis Lazuli

Lapis Lazuli (Complex aggregate of Lazurite, Calcite, and Pyrite)