Ironstone Concretion (Moqui Marble type)
Ironstone Concretion (Fe2O3 with SiO2 core)
sedimentary
Category
Sedimentary Rock
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Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Concretion
Sedimentary Concretion (e.g., Siderite or Ironstone)
sedimentary
Pebble (likely Sandstone or Granitic Pebble)
Clastic Sediment (or specific rock type, e.g., Arenite, Granitoid Pebble)
Rock (likely Sedimentary)
Geode (Unopened)
Siliceous Geode (SiO2)
sedimentary
Chert (varietal: Jasper or Flint likely, but definitive identification is difficult from image)
SiO₂ (silicon dioxide)
Sedimentary
Ironstone Concretion (Ironstone Gourd)
Limonite/Goethite Concretion (FeOO(H))
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) in a sedimentary or volcanic host
mineral
Chert (containing Quartz)
Microcrystalline Silica (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and organic impurities
sedimentary
Sandstone (lithic wacke)
Arenite / Lithic Wacke (mostly SiO2 with rock fragments)
sedimentary
Chert Geode or Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Jasper (a variety of Chalcedony, SiO2)
Mineral
Microcrystalline Quartz (Chert/Agate)
Silicon Dioxide (SiO2)
sedimentary
Chert / Jasper
Silicon Dioxide (SiO2)
sedimentary
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Chert with Desert Varnish
Cryptocrystalline Quartz (SiO2) with Manganese/Iron oxide coating
sedimentary
Geode (unopened)
Quartz-filled Geode (SiO2)
sedimentary
Banded Calcite (Green Onyx)
Calcium Carbonate (CaCO3)
sedimentary
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (predominantly SiO2 quartz grains)
sedimentary
Kambaba Jasper (Crocodile Jasper)
Stromatolitic Rhyolite/Jasper (SiO2)
sedimentary
Chert (Jasper and Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
mineral
Asphalt Chunk (with aggregate)
Bituminous concrete / Anthropogenic conglomerate
sedimentary (anthropogenic/man-made conglomerate)
Agate Geode
Silicon Dioxide (SiO2)
mineral
Crazy Lace Agate
Microcrystalline Quartz (SiO2)
sedimentary
Hematite Concretion
Iron oxide (Fe2O3) in concretionary form
sedimentary
Geode (Chert/Quartz Nodule)
Silicon Dioxide (SiO2)
sedimentary
Chert (specifically Flint or Jasper-Chert)
Silicon Dioxide (SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron inclusions
sedimentary
Limonite Concretion (Ironstone)
Limonite / Goethite (FeO(OH)·nH2O)
sedimentary
Chert (varieties include Flint and Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint Nobule)
Silicon Dioxide (SiO2)
sedimentary
Quartz Drusy on Matrix
Silicon Dioxide (SiO2)
mineral
Hematite Concretion
Iron(III) oxide (Fe2O3)
mineral
Herkimer Diamond (Quartz)
Silicon Dioxide (SiO2)
mineral
Black Jasper (Black Onyx substitute)
Silicon Dioxide (SiO2) with carbonaceous impurities
sedimentary (microcrystalline quartz)
Travertine (used in construction, not a 'specimen' in situ)
Travertine
Sedimentary
Concretion (Sandstone)
Sandstone Concretion
sedimentary