Mineral Within Sedimentary Rock

Quartz Vein in Host Rock

Quartz (SiO2) in Mafic or Sedimentary Matrix

Sandstone (likely Quartzose Sandstone)

Arenite (primarily SiO2)

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 cement)

Sandstone (Pebble)

Arenite (primarily SiO2)

Shale

Shale (Sedimentary rock composed of mud/clay minerals)

Moss Agate

Silicon Dioxide (SiO2) with inclusions of Manganese or Iron oxide

Ruby in Zoisite (Anyolite)

Anyolite (Combination of Corundum and Zoisite)

Sandstone

Sandstone (various mineral compositions)

Sandstone (likely Siltstone)

Arenite or Siltstone (high SiO2 content)

Sandstone

Arenite (composed primarily of SiO2)

Rough Green QuartzITE / Green Aventurine

Aventurine Quartz (SiO2 + Cr-muscovite inclusions)

Banded Chalcedony (Agate)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Shale

Fissile Mudstone

Corundum (Sapphire in Host Rock)

Corundum (Aluminum Oxide, Al2O3)

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Howlite

Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)

Howlite

Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)

Pebble (Likely Basalt or Siltstone)

Clastic sedimentary rock or mafic volcanic rock

Bauxite

Bauxite (Mixture of Hydrous Aluminum Oxides)

Pegmatite with Schorl (Black Tourmaline) and Mica

Pegmatite (complex association of NaAlSi3O8, NaFe3Al6(BO3)3Si6O18(OH)4, and KAl2(AlSi3O10)(OH,F)2)

Sandstone (Quartzite-rich Cobble)

Clastic sedimentary rock (primarily SiO2)

Milky Quartz (with Iron Oxide staining)

Quartz (Silicon Dioxide - SiO2)

Quartz Geode (Cracked)

Quartz (Silicon Dioxide, SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Peridot (Olivine)

(Mg,Fe)2SiO4 (Magnesium Iron Silicate)

Heliotrope (Bloodstone)

Cryptocrystalline Quartz (SiO2) with inclusions of Hematite (Fe2O3)

Sandstone (with Iron concretions/staining)

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

Sandstone

Arenite (composed primarily of SiO2)

Quartz Geode (Water-worn)

Silicon Dioxide (SiO2)

Quartz Geode (with possible Manganese or Goethite coating)

Silicon Dioxide (SiO2)

Sandstone (Quartzose)

Sandstone (clastic sedimentary rock, primarily SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone

Arenite (SiO2 based)

Lepidolite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

Basalt with Jasper Veining

Basaltic Rock with Cryptocrystalline Quartz (SiO2)

Chert (Flint)

Chert (predominantly SiO₂ - silicon dioxide)

Quartz Geode (Nodule)

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2 primarily)

Dendritic Agate or Manganese Nodule in Chert/Limestone

Silicon Dioxide (SiO2) with Manganese Oxide (MnO2) inclusions

Chert Breccia (Yellow Jasper)

Silicon Dioxide (SiO2) - Brecciated Chert

Limestone

Calcium Carbonate (CaCO3)