Piddock bored rock (likely Mudstone or Shale)
Ichnofossil (Gastrochaenolites borings) in Fine-grained Sedimentary Rock
sedimentary
Category
Mineral (Or Mineraloid If Microcrystalline)
Browse mineral (or mineraloid if microcrystalline) specimens identified by the Rock Identifier community.
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Chalcedony
Silicon Dioxide (SiO2)
mineral
Chert (Red Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Kambaba Jasper (Crocodile Jasper)
Stromatolitic Rhyolite/Jasper (SiO2)
sedimentary
Red Jasper
Microcrystalline quartz (SiO2)
sedimentary
Yellow Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Green Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Opalite
Synthetically produced glass (Silicon Dioxide with metallic inclusions)
Mineraloid (Man-made Glass)
Polished orbicular jasper (likely leopard-skin or brecciated jasper)
Microcrystalline quartz (SiO₂), with iron-oxide and other mineral inclusions; exact variety cannot be confirmed from the photo
metamorphic
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert Pebble (Jasper/Flint variant)
Microcrystalline Quartz (SiO2)
sedimentary
Banded Flint / Chert
Microcrystalline Quartz (SiO2)
sedimentary
Orbicular jasper (likely ocean jasper)
Silica-rich microcrystalline quartz/chalcedony with feldspar and accessory minerals; composition varies
mineral
Fancy Jasper
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Limonite Nodule
FeO(OH)·nH2O (Hydrated iron oxide-hydroxide)
mineral
Beach Pebble (Chert / Greywacke)
Silicon Dioxide (SiO2) / Quartz-rich Sandstone
sedimentary
Red Jasper
Jasper (Silicon Dioxide, SiO2 with Iron Oxide impurities)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2 with iron oxide inclusions)
sedimentary
Chert (Agate / Jasper pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Pebble (Chert/Chalcedony variety)
Silicon Dioxide (SiO2)
sedimentary
Chert (with Quartz veins)
Microcrystalline Quartz (SiO2)
sedimentary
Limonite Nodules / Goethite
Hydrated Iron Oxide-Hydroxide (FeO(OH)·nH2O / Fe2O3·nH2O)
mineral
Chert nodules
Microcrystalline Quartz (SiO2)
sedimentary
Red Jasper
SiO2 (Microcrystalline Quartz)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Polychrome Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Tumbled quartz-like pebble
Quartz (silicon dioxide, SiO₂), possibly iron-stained chalcedony
mineral
Petrified Wood
Silicified wood (SiO2)
fossil
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Basalt-Amugydule (Amygdaloidal Basalt)
Aphanitic Mafic Igneous Rock with Vesicle Infillings
igneous
Manganese Oxide Crust on Limestone
Manganese Oxides (e.g., Pyrolusite MnO2 or Romanechite) on CaCO3
sedimentary
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Quartz on Limestone
Silicon Dioxide (SiO2) on Calcium Carbonate (CaCO3)
Mineral on Sedimentary
Green Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert Pebble with Quartz Vein
Microcrystalline Quartz (SiO2)
sedimentary
Vein-filled Sedimentary Rock
Silicified sedimentary rock with quartz/calcite vein
sedimentary
Limonite Concretion / Ironstone
Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O
mineral
Polished brecciated jasper
Jasper (microcrystalline quartz, SiO₂), brecciated variety
mineral