Fossil-bearing ironstone or weathered concretion
Indeterminate; likely ferruginous sandstone/concretion containing a partial fossil impression
fossil
Category
Organic Materia (Not A Rock Or Mineral)
Browse organic materia (not a rock or mineral) specimens identified by the Rock Identifier community.
Learn about Organic Materia (Not A Rock Or Mineral) in the encyclopedia
View all →
Quartz Druze on Matrix
Silicon Dioxide (SiO2)
mineral
Calcareous Tufa (or Travertine)
Calcium Carbonate (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Chert (Green Chert/Jasper)
Chert (primarily Microcrystalline Quartz, SiO2)
sedimentary
Favosites Fossil (Honeycomb Coral)
Favosites (Extinct genus of Tabulate Coral)
sedimentary
Druzy Quartz on Chalcedony Matrix
Silicon Dioxide (SiO2)
mineral
Conglomerate
Conglomerate (a clastic sedimentary rock)
Sedimentary Rock
Herkimer Diamond (Quartz with Carbon Inclusions)
Silicon Dioxide (SiO2) with Anthraxolite inclusions
mineral
Petrified Wood
Silicified wood (Quartz / Chalcedony replacement of organic cellulose)
fossil
Amygdaloidal Basalt
Amygdaloidal Mafic Volcanic Rock
igneous
Granite
Granite (Intrusive Igneous Rock)
igneous
Granite
Felsic intrusive igneous rock
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Granite
Intrusive Igneous Rock
igneous
Granite Pebble
Intrusive igneous rock (Quartz, Feldspar, Mica)
igneous
Granite
Felsic intrusive igneous rock
igneous
Basalt with Vesicles
Vesicular Basalt (comprising Plagioclase Feldspar, Pyroxene, and Olivine)
igneous
Milky quartz with dark host-rock inclusions
Quartz (SiO₂), likely in a granitic or metamorphic matrix
mineral
Chert / River Jasper
Silicon Dioxide (SiO2)
sedimentary
Quartz and Iron Oxide
Quartz (Silicon Dioxide, SiO2) with possible Limonite/Hematite inclusions
mineral
Jasper (Petrified Wood variant)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (Red Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Fossiliferous Kalkstein (Marl/Sandstone)
Fossiliferous calcarenite/siltstone
sedimentary
Granite
Intrusive Igneous Rock (composed of quartz, alkali feldspar, and plagioclase)
igneous
Sandstone (lithic wacke)
Arenite / Lithic Wacke (mostly SiO2 with rock fragments)
sedimentary
Bauxite (Laterite Clay)
Bauxite (mixture of Hydrous Aluminum Oxides: Gibbsite Al(OH)3, Boehmite and Diaspore AlO(OH))
sedimentary
Chert (Flint) with Iron Staining
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Sandstone
Clastic sedimentary rock (Quartz arenite)
sedimentary
Mixed Rock and Mineral Collection
Mixed Assemblage (includes Quartz, Jasper, Feldspar, and Turquoise-colored stones)
mineral
Amber
Succinite
Mineraloid
Sandstone or Weathered Conglomerate
Sedimentary Rock (Quartzose Sandstone / Lithic Arenite)
sedimentary
Porphyritic Basalt
Porphyritic Basalt with Plagioclase Phenocrysts
igneous
Chert (specifically Flint or Common Chert)
Chert (Cryptocrystalline Silica, SiO2)
sedimentary
Sandstone Pebble / Quartzite Pebble
SiO2 (Silicon Dioxide enriched sedimentary rock)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Banded Slate
Slate (Metamorphosed Siltstone/Mudstone)
metamorphic
Synthetic Resin Charm (Seal Shape)
Polymer Resin with plastic glitter / Polyethylene terephthalate glitters
Synthetic material (Not a rock or mineral)
Bouncy Ball (Synthetic Rubber Polymer)
Polybutadiene / Ethylene Vinyl Acetate (EVA)
Synthetic material (Not a rock or mineral)
Chert (variant Flint/Jasper)
Microcrystalline Opaline Silica (SiO2)
sedimentary
Banded Gneiss
Gneiss (Felsic to Mafic Metamorphic Rock)
metamorphic