Quartz Pebble (likely Chalcedony or Quartzite)
Silicon Dioxide (SiO2)
mineral
Category
Mineral And Sedimentary
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Fancy Jasper
Silicon Dioxide (SiO₂)
sedimentary
Celestine (Celestite)
Strontium sulfate (SrSO4)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Zebra Jasper
Silicon Dioxide (SiO2) with inclusions
sedimentary
Howlite
Howlite (Calcium borosilicate hydroxide, Ca2B5SiO9(OH)5)
mineral
Marble
Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)
metamorphic
Sandstone (Red Sandstone / River Stone)
Arenite (composed primarily of Quartz, SiO2, with Iron Oxide cementation)
sedimentary
Sandstone (with Chert/Quartzite)
Arenite (primarily SiO2)
sedimentary
Sandstone (likely Quartzose Sandstone)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone Pebble
Arenite (SiO2 based)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) in a concretion
sedimentary
Red Sandstone
Clastic sedimentary rock (primarily SiO2 with Fe2O3 iron oxide staining)
sedimentary
Mosasaur Tooth Fossil
Mosasauridae (likely Prognathodon or Mosasaurus)
fossil
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (SiO2 with Fe2O3/FeO oxides)
sedimentary
Yellow Jasper / Chalcedony
Silicon Dioxide (SiO2) with iron inclusions
mineral
Biotite (Mica)
Biotite group (K(Mg,Fe)3AlSi3O10(F,OH)2)
mineral
Limonite Pseudomorph after Pyrite
Limonite (FeO(OH)·nH2O) replacing Pyrite (FeS2)
mineral
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Himalayan Pink Salt
Halite (NaCl) with trace minerals
mineral
Sandstone (Quartz Arenite)
Sandstone (SiO2 with possible mineral cements)
sedimentary
Fossilized Dinosaur Skull (Tyrannosaurus rex)
Tyrannosaurus rex (permineralized fossil), rich in Hydroxylapatite/Silica
sedimentary
Fossilized Shark Tooth
Fossilized elasmobranch tooth (Apatite/Calcium Phosphate)
sedimentary
Dinosaur Fossil (Tyrannosaurus rex skull replica/specimen)
Tyrannosaurus rex (fossilized in permineralized sedimentary matrix)
sedimentary
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Sandstone
Arenite (SiO2 based with cement)
sedimentary
Sandstone
Arenite (SiO2 principal component)
sedimentary
Gneiss (with Quartzite and Mica)
Gneiss
metamorphic
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (Water-worn Pebble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (complex silicate composition with iron oxides)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Aragonite Star Cluster
Aragonite (CaCO3)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral