Limestone (River Pebble)
Calcite (Calcium Carbonate) - CaCO3
sedimentary
Category
Sedimentary (Fossiliferous)
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Crinoid Marble (Fossilized Limestone)
Crinoidal Limestone (comprising Calcite/Aragonite CaCO3)
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
Blue Apatite
Ca5(PO4)3(F,Cl,OH)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3(F,Cl,OH))
mineral
Yellow Apatite
Fluorapatite (Ca5(PO4)3(F,Cl,OH))
mineral
Jasper (or possibly Agate/Chalcedony) beads
SiO2 (Silicon Dioxide)
mineral
Sphalerite
Zinc Sulfide (ZnS)
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
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (Banded)
Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide staining)
sedimentary
Pebble
Lithified rock fragment / Sedimentary clast
sedimentary
Quartz-veined Limestone
Sedimentary limestone with quartz/calcite veinlets
sedimentary
Sandstone
Quartz Arenite / Clastic Sedimentary Rock
sedimentary
Sandstone
Clastic sedimentary rock (Quartz arenite)
sedimentary
Sandstone and Mixed Rock Assemblage
Clastic Sedimentary Rock / Quartz Arenite
sedimentary
Sandstone and Gravel Aggregate
Clastic Sedimentary Rock / Quartzose Sandstone
sedimentary
Ferruginous Sandstone (River Pebble)
Clastic Sedimentary Rock (Iron-rich)
sedimentary
Chert
Chert (variant of microcrystalline quartz)
Sedimentary
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Sandstone
Quartz Arenite / Sedimentary Rock
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
Sedimentary Sandstone (Sandstone Slab)
Arenite (SiO2 with Fe2O3 staining)
sedimentary
Fossilized Gastropod Internal Mold
Gastropoda (Steinkern fossil)
fossil
Hematite
Hematite (Fe2O3)
mineral
Jasper (Iron-rich Chert)
Silicon Dioxide (SiO2) with impurities of Hematite or Goethite
sedimentary
Geode (unopened)
Silica-filled Concretion (SiO2)
sedimentary
Chert (specifically Silex or Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Satin Spar (Gypsum)
Hydrous Calcium Sulfate (CaSO4·2H2O)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Fossilized Gastropod / Coral
Phylum Mollusca / Cnidaria (Silicified or Calcified)
fossil
Agate
Silicon Dioxide (Chalcedony), SiO2
gemstone
Sandstone
Sedimentary rock composed mainly of quartz sand grains
sedimentary