Amber
Succinite (a specific common type) or Fossilized Tree Resin (C10H16O)
Mineraloid
Category
Organic Specimen (Fossil)
Browse organic specimen (fossil) specimens identified by the Rock Identifier community.
Chert (variant Flint)
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz / Chalcedony: SiO2)
metamorphic
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Arenite (Sedimentary rock composed of sand-sized grains, primarily SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Amber
Succinite (Fossilized Tree Resin)
mineraloid
Gastropod Fossil (Snail Steinkern)
Class Gastropoda fossil, composed of Calcium Carbonate (CaCO3)
sedimentary
Green Jasper (with Quartz veining)
Jasper (Silica-rich microcrystalline variety of Quartz), formula: SiO2
sedimentary
Limestone with Algal/Lichen Colonization
Calcium Carbonate (CaCO3)
sedimentary
Crushed Limestone Aggregate
Limestone (Calcium Carbonate, CaCO3)
sedimentary
Petrified Wood
Silicified Wood (SiO2 - primarily Quartz/Chalcedony/Opal)
Mineral/Fossil (Sedimentary context)
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Chert (Field Stone)
Microcrystalline Quartz (SiO2)
sedimentary
Limestone (with Iron-Oxide staining)
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Ferruginous Sandstone
Sandstone with iron oxide (Hematite/Limonite) cement
sedimentary
Orthoceras Fossil in Limestone
Orthoceras regulare (Class Cephalopoda; Order Orthocerida)
sedimentary
Banded Chert (Ironstone/Jasper)
Cryptocrystalline Quartz (SiO2) with Iron Oxides
sedimentary
Septarian Nodule (Dragon Stone)
Septarian Nodule (Calcium Carbonate/Aragonite/Calcite Concretion)
sedimentary
Hag Stone
Perforated Chert (Microcrystalline Silica, SiO2)
sedimentary
Chert (with Manganese Dendrites)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Sandstone Concretion
Clastic sedimentary rock (primarily Silica, SiO2, or Calcium Carbonate, CaCO3)
sedimentary
Fossilized Shark Tooth (Otodus obliquus)
Otodus obliquus (Mineral composition: Bio-apatite/Calcium Phosphate replaced by various minerals)
sedimentary (fossil)
Pink Opal
Amorphous Hydrous Silica (SiO2·nH2O)
mineral
Chert (Jasper variety)
Chert (SiO2)
sedimentary
Picasso Jasper (or Picasso Marble)
Metamorphosed Limestone (Calcium Carbonate, CaCO3, with impurities)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Agatized Chert / Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Limestone
Calcium carbonate (CaCO3)
sedimentary
Sandstone (Ferruginous)
Arenite (SiO2 with iron oxide impurities)
sedimentary
Chert (Gravel pebble)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Fossilized Brachiopod
Brachiopoda (Class Rhynchonellata or Spiriferida)
sedimentary
Fossilized Bone Fragment
Permineralized Skeletal Element (Likely Vertebrate)
sedimentary
Septarian Nodule
Septarian Concretion (CaCO3 with Siderite/Calcite/Aragonite)
sedimentary
Sandstone (Weathered Pebble)
Arenite (SiO2 primarily)
sedimentary
Chert (often called Flint when dark)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Moss Agate
Silicon Dioxide (SiO2) with inclusions of hornblende, chlorite, or manganese/iron oxides
mineral
Sandstone (Quartz-rich)
Arenite (SiO2 based)
sedimentary