Sandstone
Arenite (SiO2 primarily)
sedimentary
Category
Mineral And Sedimentary
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Limonite (Hydrated Iron Oxide / Bog Iron)
FeO(OH)·nH2O
Mineral (Sedimentary context)
Gneiss
Gneiss
metamorphic
Limonite (Iron-rich Siltstone / Sandstone base)
Hydrous ferric oxide mixture (FeO(OH)·nH2O)
sedimentary
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Jasper or Agate pendant
Silicon dioxide (SiO2)
Mineral
Chalcedony (variations like Agate or Jasper)
Chalcedony (SiO₂ - microcrystalline quartz)
Mineral
Banded Flint / Chert
Microcrystalline Quartz (SiO2)
sedimentary
Bauxite (Concretionary)
Bauxite (Al(OH)3, AlO(OH))
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Hematite (Iron Ore)
Hematite (Fe2O3)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz / Common Opal Transition
Silicon Dioxide (SiO2)
mineral
Laterite
Laterite (Ferricrete / Alcrete)
sedimentary
Green Jasper
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Sandstone (with minor quartz and possible clay components)
Clastic Sedimentary Rock (SiO2 dominated)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone with Quarzite clasts
Arenite (SiO2 based)
sedimentary
Shale
Fissile mudstone (primarily clay minerals and silt-sized quartz)
sedimentary
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (composed mostly of SiO2)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone (Greywacke)
Arenite/Greywacke (SiO2 major)
sedimentary
Ferruginous Sandstone (Gozzanous)
SiO2 (Quartz) with FeO(OH) (Goethite) or Fe2O3 (Hematite) coating
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Limonite Concretion
Limonite (Hydrated iron(III) oxide-hydroxides, FeO(OH)·nH2O)
sedimentary
Bauxite
AlOx(OH)3-2x (mixture of Gibbsite, Boehmite, and Diaspore)
sedimentary
Fossilized Shark Tooth
Bioapatite (Calcium Hydroxyapatite) replacement
mineral
Desert Varnish on Sandstone
Ferromanganese coating on Quartz Arenite
sedimentary
Geode (Unopened)
Silicon Dioxide (SiO2) in sedimentary vugs
sedimentary
Almandine Garnet in Matrix
Almandine, Fe3Al2(SiO4)3
metamorphic
Carnelian (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Garnet in Matrix (Schist or Quartz)
Almandine Garnet, Fe3Al2(SiO4)3
metamorphic
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Shale creek bed
Shale (fine-grained clastic sedimentary rock)
Sedimentary
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
mineral
Geode (unopened) or Calcareous Nodule
Siliceous or Calcareous Concretion/Nodule
sedimentary
Sparkling Druzy Quartz on Matrix
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Green Fluorite (likely synthetic or heat-treated for jewelry)
Calcium Fluoride (CaF2)
mineral
Sandstone
Arenite (composed of SiO2, CaCO3, or iron oxides)
sedimentary
Limonite (Ironstone Concretion)
Limonite (Hydrated iron(III) oxide-hydroxide, mixtures of FeO(OH)·nH2O)
sedimentary