Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
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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Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2 - Quartz/Chalcendony replacing organic matter)
sedimentary
Fossilized Coral
Anthozoa
fossil
Ammonite Fossil
Ammonoidea
fossil
Galena
Lead Sulfide (PbS)
mineral
Petrified Wood
Silicified wood (primarily SiO2 - Silicon Dioxide)
mineral
Chert with Druzy Quartz Geode
Microcrystalline Quartz (SiO2)
sedimentary
Fossil Shark Tooth
Chondrichthyes (class)
fossil
Galena specimen
Galena (PbS), commonly associated with sphalerite and other sulfides
mineral
Red Jasper
Jasper (Silicon Dioxide with iron oxide inclusions), SiO2
mineral
Jasper (Red-Brown)
Silicon Dioxide (SiO2) with Iron Oxide impurities
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
sedimentary
Limonite-pseudomorph after Pyrite (Prophecy Stone)
Goethite and Limonite secondary minerals (FeO(OH)·nH2O) replacing Pyrite (FeS2)
mineral
Flint
Chert (SiO2)
sedimentary
Jasper
Jasper (Silicified microcrystalline quartz) - SiO2
sedimentary
Fossilized wood (petrified wood)
Silicified permineralized wood, commonly quartz (SiO₂) replacing or infilling woody tissue
fossil
Fossil Shark Tooth
Chondrichthyes dentition (Fossilized Tooth)
fossil
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Shell
Invertebrate fossil (Bivalvia or Brachiopoda)
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Chert (Agate/Flint variant)
Microcrystalline Quartz (SiO2)
sedimentary
Chert / Flint
Cryptocrystalline Quartz (SiO2)
sedimentary
Fossil Snail
Gastropoda (fossilized)
fossil
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (often called Flint when dark)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Red jasper (iron-rich chert), possibly brecciated
Microcrystalline quartz/chalcedony (SiO₂) colored by hematite and goethite
sedimentary
Chert (Field Stone)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Polished black-and-gold brecciated stone, likely sheen obsidian or brecciated jasper
Probable volcanic glass (obsidian), SiO₂, with iron-oxide or rhyolitic inclusions; exact identification is uncertain from the photograph
igneous
Fossiliferous limestone (coral-rich limestone)
Bioclastic carbonate rock, composed mainly of calcite (CaCO₃), with fossilized colonial coral or bryozoan material
sedimentary
Chert (Field-collected variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Fossil Shell (Bivalve)
Class Bivalvia (fossilized)
fossil
Chert (Flint)
Chert (SiO2)
sedimentary
Echinoid Fossil (Sea Urchin)
Echinoidea (specifically likely Schizaster or similar genus), calcium carbonate (CaCO3)
sedimentary
Fossilized Coral
Rugosa / Scleractinia (Agatized or Calcitized Coral)
fossil
Fossilized Echinoid / Sea Urchin Internal Mold
Echinoidea internal cast (steinkern)
fossil
Galena
Lead sulfide (PbS)
mineral
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Crinoid Stem Fossil
Crinoid columnal (Echinodermata)
fossil
Fossil coral pebble
Fossilized colonial coral, commonly Favosites or Hexagonaria
fossil