Chert / Flint Pebble
Microcrystalline Silica (SiO2)
sedimentary
Category
Sedimentary (With Some Aspects Of Mineral Replacement)
Browse sedimentary (with some aspects of mineral replacement) specimens identified by the Rock Identifier community.
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Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Chert (Flint Nodules)
Chert (Silicon Dioxide, SiO2)
sedimentary
Polished red jasper
Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides
mineral
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Fossilized bivalve shell
Paleozoic–Mesozoic bivalve fossil; commonly classified as Bivalvia indet.
fossil
Fossil gastropod shell
Fossilized or mineral-replaced gastropod (class Gastropoda), exact genus indeterminate
fossil
Chert Nodule in Limestone
Chert (Microcrystalline Quartz, SiO2) and Limestone (Calcium Carbonate, CaCO3)
sedimentary
Greenstone / River Siltstone
Metasedimentary Greenstone (Chlorite-rich Siltstone)
metamorphic
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Green Jasper
Silicon Dioxide (SiO2) with iron silicate inclusions
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Banded Gneiss
Gneiss
metamorphic
Shark Tooth Fossil
Chondrichthyes fossil
fossil
Quartz pebble
Silicon dioxide (SiO2)
mineral
Tumbled brown agate
Microcrystalline quartz (SiO₂), variety of chalcedony
mineral
River Stone (Greywacke)
Greywacke (immature sandstone)
sedimentary
Polished orbicular agate beads
Microcrystalline quartz (SiO₂), chalcedony with orbicular banding
mineral
Fossilized Bone / Dinosaur Fossil
Fossilized vertebrate bone (permineralized)
fossil
Chert (Nodule)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Polished fossil shell or bone fragment (tentative)
Indeterminate biogenic carbonate or fossilized bone; possibly a small gastropod/bivalve fragment
fossil
Weathered fossil fragment, possibly bone
Indeterminate fossilized bone; likely mineralized vertebrate bone (apatite-rich)
fossil
Orbicular jasper (likely ocean jasper)
Silicified microcrystalline quartz/chalcedony, commonly called Ocean Jasper; predominantly SiO₂ with iron-oxide inclusions
sedimentary
Fossilized Bark
Lepidodendron / Sigillaria fossil impression
fossil
Chert (varietal Jasper or Mudstone Flint)
Silicon dioxide (SiO2) with impurities
sedimentary
Jasper
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary
Chert Geode or Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Flint
Silicon Dioxide (SiO2) - variety of Chert
sedimentary
Fossil Shell (Bivalve)
Class Bivalvia (Likely a member of the Ostreidae or Gryphaeidae family), CaCO3
sedimentary
Fossilized Coral (Favosites)
Favosites (extinct genus of tabulate coral)
sedimentary
Amber (likely a small rough amber piece)
Fossilized plant resin; amber is an organic mineraloid, not a crystalline mineral
gemstone
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Flint
Microcrystalline Quartz (SiO2)
sedimentary
Flint
Silicon dioxide (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Microcrystalline quartz (SiO2)
sedimentary
Flint (Chert)
Silicon Dioxide (SiO2)
sedimentary
Flint / Chert
Silicon dioxide (Microcrystalline quartz, SiO2)
sedimentary
Flint
SiO2 (Cryptocrystalline Quartz)
sedimentary
Flint / Chert
Silicon dioxide (SiO2)
sedimentary
Flint (Chert)
Silicon Dioxide (SiO2)
sedimentary