Unakite
Altered Granite (Epidotized Granite)
metamorphic
Category
Sedimentary (Fossilized Organic Remain)
Browse sedimentary (fossilized organic remain) specimens identified by the Rock Identifier community.
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Fossil Shell
Invertebrate fossil (Mollusca)
fossil
Kambaba Jasper
Stromatolite Jasper (Microcrystalline Quartz with Cyanobacteria fossile)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Fossilized Bone Chunk (likely Dinosaur or Large Mammal)
Permineralized Fossil Bone
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Unakite Jasper
Unakite (Epidotized Granite)
metamorphic
Fossilized Brachiopod or Gastropod
Phylum Brachiopoda / Phylum Mollusca
fossil
Red Shale
Lutite (primarily composed of Hydrous Aluminum Silicates with Hematite staining)
sedimentary
Sea Urchin Fossil
Echinoidea (test/fossil)
fossil
Fossilized shell fragment
Indeterminate fossil mollusk; likely a silicified or mineral-replaced bivalve/gastropod fragment
fossil
Amber
Succinite (with a generalized formula of C10H16O)
mineral
Siderite Concretion (Nodule)
Iron Carbonate (FeCO3) Concretion
sedimentary
Gastropod Fossil
Phylum Mollusca, Class Gastropoda (Calcium Carbonate, CaCO3)
sedimentary
Amber
Succinite
Organic (Mineraloid)
Script Jasper
Cryptocrystalline Quartz (SiO2) with fossiliferous inclusions
sedimentary
Shale
Shale (clastic sedimentary rock)
Sedimentary
Brachiopod Fossil
Phylum Brachiopoda (replaced by Calcite or Silica)
sedimentary
Belemnoit Fossil (Thunderstick)
Belemnitida (Internal rostrum)
fossil
Fossilized shell or bone fragment
Likely bioclast composed mainly of calcium carbonate (calcite/aragonite); exact organism is indeterminate from the image
fossil
Coquina with Calcite Crystals
Calcareous Bioclastic Grainstone (CaCO3)
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Mookaite Jasper
Radiolarite (Silica with iron oxides like Goethite and Hematite)
sedimentary
Vesicular volcanic rock, likely pumice
Pumice (highly vesicular volcanic glass; composition commonly rhyolitic to andesitic)
igneous
Kambaba Jasper (Crocodile Jasper)
Fossilized Stromatolite (Cyanobacteria microfossils in silica Matrix)
sedimentary
Petoskey Stone
Hexagonaria percarinata
sedimentary
Fossiliferous Mudstone / River Pebble
Sedimentary rock with trace fossil or inclusion
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Crinoid Fossil Limestone
Crinoidal Limestone (Calcite / CaCO3)
sedimentary
Weathered vesicular volcanic rock, likely basaltic scoria
Vesicular basalt/scoria; chiefly plagioclase, pyroxene, olivine, and volcanic glass
igneous
Geode / Fossilized Gastropod or Shell Cast
Silicon dioxide (Quartz) replacement / fossil mold
sedimentary
Petoskey Stone
Hexagonaria percarinata
sedimentary
Banded River Rock with Quartz Vein
Siltstone/Greywacke with Quartz (SiO2)
sedimentary
Concretion (Sandstone)
Carbonate-cemented Sandstone Concretion
sedimentary
Fossiliferous Shale (with Vertebrate Bones)
Laminated Mudstone containing Fossilized Bone (Apatite)
sedimentary
Weathered Quartzite or Chert Pebble
Silicon Dioxide (SiO2)
metamorphic or sedimentary
Amber
Succinite (Approximate formula: C10H16O)
Mineraloid
Sandstone
Arenite
sedimentary
Sandstone Pebble
Arenite (typically SiO2)
sedimentary
Polished ocean jasper (orbicular jasper)
Silica-rich chalcedony/quartz aggregate; chiefly microcrystalline SiO₂ with iron-oxide inclusions
mineral
Weathered quartz-rich rock, possibly granite or gneiss
Granite-like aggregate: quartz (SiO₂), feldspar, and minor dark minerals
igneous
Fossil Coral and Quartz Pebble
Fossilized Anthozoa / Silicon Dioxide (Quartz)
sedimentary