Sandstone
Arenite (SiO2 based)
sedimentary
Category
Sedimentary Or Mineral
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Crinoid Stem Fossil
Crinoid (Class Crinoidea)
fossil
Sandstone
Arenite (SiO2 based)
sedimentary
Banded Agate
Sedimentary Cryptocrystalline Quartz (SiO2)
mineral
Sandstone (Ferruginous/Banded)
Clastic Terrigenous Sandstone (SiO2 with Fe2O3 cement)
sedimentary
Dalmation Stone
Peralkaline Rock (SiO2 with Arfvedsonite)
igneous
Ironstone Concretion
Siderite or Hematite-rich Concretion (FeCO3 / Fe2O3)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
mineral
Petrified Wood
Silicified Wood (primarily Quartz/SiO2)
mineral
Red Siltstone (or Red Shale)
Clastic Sedimentary Rock (Composition: primarily Quartz, Clay minerals, and Hematite Fe2O3)
sedimentary
Quartz Druzy
Crystalline Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss
metamorphic
Red Sandstone
Arenite (primarily SiO2 with Fe2O3)
sedimentary
Red Sandstone
Arenite (with Iron Oxide)
sedimentary
Schist
Mica Schist
metamorphic
Bauxite
Bauxite (Al2O3·2H2O)
sedimentary
Quartz (Raw Chunk)
Silicon Dioxide (SiO2)
mineral
Sandstone
Clastic sedimentary rock (Arenite)
sedimentary
Wallboard/Drywall (Gypsum-based)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
sedimentary
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Red Sandstone
Arenite with iron oxide (Hematite) cement
sedimentary
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrated Iron Oxide)
mineral
Sandstone
Arenite (SiO2 based with primary clasts 0.0625 to 2 mm)
sedimentary
Yellow Calcite (Polished Pebble)
Calcium Carbonate (CaCO3)
mineral
Celestite (Celestine)
Strontium Sulfate (SrSO4)
mineral
Carnelian / Agate
Silicon Dioxide (SiO2) - Chalcedony
mineral
Agate
Cryptocrystalline quartz (SiO2)
mineral
Agate
Agate (Cryptocrystalline Quartz)
mineral
Grey Chalcedony (Tumbled Moon)
Microcrystalline Quartz (SiO2)
mineral
Chalcedony (Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz (Small Fragment)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite
sedimentary
Sandstone (Quartzose)
Arenite (SiO2)
sedimentary
Septarian Nodule
Septarian Concretion (Calcium Carbonate/Aragonite/Calcite/Siderite)
sedimentary
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Sandstone (Weathered Cobble)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Quartz (Chert/Chalcedony variety)
Silicon Dioxide (SiO2)
mineral