Travertine (or Calcareous Tufa)
Calcium Carbonate (CaCO3)
sedimentary
Category
Sedimentary (Anthropogenic)
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Sandstone
Arenite (SiO2 predominantly)
sedimentary
Sandstone (likely Arkosic)
Clastic Sedimentary Rock (primarily SiO2 with Feldspar)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Seashell Fossil
Invertebrate Bivalve / Gastropod Fossil (Calcium Carbonate, CaCO3)
fossil
Sandstone
Sedimentary Clastic Rock (Quartz Arenite)
sedimentary
Limestone Pebble
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Sandstone Pebble
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Tumbled Agate
Silicon Dioxide (SiO2)
gemstone
Sandstone (Pebble)
Sandstone (principally SiO2 with iron oxide impurities)
sedimentary
Limestone (River Pebble)
Calcite (Calcium Carbonate) - CaCO3
sedimentary
Crinoid Marble (Fossilized Limestone)
Crinoidal Limestone (comprising Calcite/Aragonite CaCO3)
sedimentary
Banded Iron Formation (BIF) / Banded Sandstone Nodule
Hematite-rich Sandstone / Ferruginous Chert
sedimentary
Ironstone Concretion / Limonite-stained Siltstone
Ironstone (primarily Limonite FeO(OH)·nH2O and Siltstone)
sedimentary
Sandstone (with minor weathering/pitting)
Clastic Sedimentary Rock (composed mostly of SiO2)
sedimentary
Chalcedony
SiO2 (Silicon Dioxide)
mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sphalerite
Zinc Sulfide (ZnS)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3(F,Cl,OH))
mineral
Jasper (or possibly Agate/Chalcedony) beads
SiO2 (Silicon Dioxide)
mineral
Blue Apatite
Ca5(PO4)3(F,Cl,OH)
mineral
Yellow Apatite
Fluorapatite (Ca5(PO4)3(F,Cl,OH))
mineral
Clear Quartz (Faceted) or Cubic Zirconia / Glass imitation
SiO2 (if Quartz), ZrO2 (if Cubic Zirconia)
mineral
Jasper or Agate
Silicon dioxide (SiO2)
Mineral
Sandstone (Banded)
Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide staining)
sedimentary
Pebble
Lithified rock fragment / Sedimentary clast
sedimentary
Sandstone
Quartz Arenite / Clastic Sedimentary Rock
sedimentary
Sandstone and Mixed Rock Assemblage
Clastic Sedimentary Rock / Quartz Arenite
sedimentary
Sandstone and Gravel Aggregate
Clastic Sedimentary Rock / Quartzose Sandstone
sedimentary
Quartz-veined Limestone
Sedimentary limestone with quartz/calcite veinlets
sedimentary
Fossiliferous Sandstone
Sedimentary rock containing invertebrate fossils
fossil
Sandstone
Clastic sedimentary rock (Quartz arenite)
sedimentary
Ferruginous Sandstone (River Pebble)
Clastic Sedimentary Rock (Iron-rich)
sedimentary
Chert
Chert (variant of microcrystalline quartz)
Sedimentary
Sandstone
Quartz Arenite / Sedimentary Rock
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Sandstone
Sedimentary Rock (Quartz Arenite)
sedimentary
Tumbled brown quartz/chert pebble
Microcrystalline quartz (SiO₂), possibly chert or jasper
mineral
Geode (Unopened)
Siliceous Septarian Concretion / Geode (SiO2)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Chert / Quartzite
Silicon Dioxide (SiO2)
sedimentary
Sedimentary rock with quartz veining
Laminated siltstone or mudstone with hydrothermal quartz veins
sedimentary