Chert Pebble
Microcrystalline silica (SiO2)
sedimentary
Category
Organic Specimen (Fossil)
Browse organic specimen (fossil) specimens identified by the Rock Identifier community.
Sandstone
Arenite
sedimentary
Quartz Vein in Pelite (Metamorphic Rock)
Hydrothermal Quartz Veining in Metasedimentary Rock (SiO2)
metamorphic
Coquina Jasper
Fossiliferous Chalcedony (SiO2)
sedimentary
Fossiliferous Limestone with Rugose Coral
Rugosa (order), typically preserved in CaCO3 (Calcite)
sedimentary
Quartzite Pebble
Quartzite (mostly SiO2)
metamorphic
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Yellow Chert (River Stone/Pebble)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Chert (Jasper variety)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (Flint variety)
Chert (SiO2)
sedimentary
Chert (variously known as Flint or River Pebble)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Red Ochre (Hematite-rich Clay)
Limonitic/Hematitic Claystone (Fe2O3 with clay minerals)
Sedimentary
Dendritic Jasper (River Stone)
Silicon Dioxide (SiO2) with Manganese/Iron Oxide inclusions
sedimentary
Sandstone
Arenite
sedimentary
Sea Shell (Fighting Conch Fragment)
Calcium Carbonate (CaCO3) - Strombus alatus fragment
sedimentary (biogenic)
Amber
Succinite
Mineraloid
Dendritic Agate
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral
Ironstone Concretion (Pot Stone)
Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Chert (specifically Flint or Common Opal variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Coral)
sedimentary
Kambaba Jasper
Stromatolite / Fossilized Algae (Rhyolitic structure)
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Chert (specifically Flint or Dark Chert)
Chert (SiO2)
sedimentary
Tiger's Eye
Titanium-containing Quartz (Silica: SiO2)
Mineral
Biggs Jasper (Picture Jasper)
Silicon Dioxide (SiO2) - Opaque Silicified Volcanic Ash
sedimentary
Dendritic Opal
Opalized Chalcedony with Manganese Inclusions (SiO2 · nH2O)
mineral
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Chert (often called Flint)
Chert (Microcrystalline or Cryptocrystalline Quartz, SiO2)
sedimentary
Chert (specifically Flint or Jasper variant)
Microcrystalline quartz (SiO2)
sedimentary
Pink Quartzite
Quartzite (SiO2)
metamorphic
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Tree Agate
Silicon Dioxide (SiO2) - Dendritic Agate/Chalcedony
sedimentary
Dragon Vein Agate
Chalcedony (cryptocrystalline silica, SiO2) variety Agate
mineral
Sandstone Concretion
Sandstone (Sedimentary Rock) with silica or calcite cement
sedimentary
Montana Moss Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Sandstone (Banded)
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
Diorite (weathered)
Intermediate plutonic igneous rock
igneous
Quartzite Cobble
Quartzite (SiO2)
metamorphic
Mookaite Jasper
Silicified Radiolarite (SiO2)
sedimentary
Dendritic Agate (River Pebble)
Silicon Dioxide (SiO2) with Manganese or Iron oxide inclusions
mineral