Sandstone
Arenite (primarily SiO2)
sedimentary
Category
Mineral And Sedimentary
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Sandstone (Weathered Pebble)
Arenite (composed primarily of SiO2)
sedimentary
Manganese Oxide Crust on Limestone
Manganese Oxides (e.g., Pyrolusite MnO2 or Romanechite) on CaCO3
sedimentary
Sandstone
Arenite (primarily Quartz, SiO2)
sedimentary
Fluorite
Calcium fluoride (CaF2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone (likely Graywacke or Arkose variant)
Clastic Sedimentary Rock (SiO2 dominated)
sedimentary
Granite or Granitic Gneiss
Granitoid / Gneiss
Igneous / Metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Fossilized Shark Tooth (Otodus)
Otodus sp. (calcium phosphate/hydroxylellite)
sedimentary
Calamites
Calamites (Pith cast fossil)
sedimentary
Agate Geode Slice
Silicon Dioxide (SiO2) with trace elements
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Galena
Lead(II) sulfide (PbS)
mineral
Celestite (Celestine)
Strontium sulfate (SrSO4)
mineral
Banded Calcite (often sold as Caribbean Calcite or Mexican Onyx)
Calcium Carbonate (CaCO3)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Ironstone Concretion (Nutstone)
Ironstone (with High Limonite/Hematite Content)
sedimentary
Zebra Jasper
Tektite variety of Silicon Dioxide (SiO2) with inclusions
sedimentary
Jasper
Silicon dioxide (SiO2)
Mineral / Sedimentary
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Celestite (Celestine)
Strontium sulfate (SrSO4)
mineral
Pyrite in Matrix (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz Geode (partially opened)
Silicon Dioxide (SiO2) with iron staining
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Marble
Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)
metamorphic
Marble
Recrystallized Calcite (CaCO3) Rock
metamorphic
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Chalcedony Geode Fragment (Botryoidal)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Sandstone (with Arkose characteristics)
Clastic sedimentary rock (SiO2 with KAlSi3O8)
sedimentary
Gneiss (specifically a weathered Amphibolite or Garnet Gneiss)
Gneiss (complex silicate composition)
metamorphic
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Fluorite (Green Fluorite)
Fluorite (Calcium Fluoride, CaF2)
mineral
Glauconitic Sandstone
Glauconitic Quartz Arenite
sedimentary
Gneiss (with iron staining)
Gneiss
metamorphic