Sandstone
Sandstone (principally SiO2/Silicon Dioxide)
sedimentary
Category
Organic Mineral
Browse organic mineral specimens identified by the Rock Identifier community.
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Vuggy Limestone
Calcium Carbonate (CaCO3) with Quartz/Calcite inclusions
sedimentary
Bivalve Fossil (Clam Stone)
Phylum Mollusca, Class Bivalvia
fossil
Sandstone
Sandstone (Quartz-rich Arenite / SiO2)
sedimentary
Amber
Fossilized Tree Resin (Succinite for Baltic varieties)
fossil
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Chert (containing Calcite or Quartz inclusions)
Silicon Dioxide (SiO2) with varying mineral impurities
sedimentary
Shark Tooth Fossil
Carcharodon / Otodus fossilized tooth (Calcium Phosphate / Hydroxyapatite)
fossil
Fossilized Shark Tooth
Carcharocles sp. (likely Lemon or Sand Tiger)
sedimentary
Fossiliferous Shale
Laminated Mudrock with plant fossils
sedimentary
Chert (White Chert)
Silicon Dioxide (SiO2)
sedimentary
Small seashell fossil or shell fragment
Likely calcium-carbonate shell material, chiefly aragonite or calcite; exact species indeterminate
fossil
Pyrite
Iron Disulfide (FeS2)
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, formula SiO2)
mineral
Fossilized Shark Tooth
Chondrichthyes (Class) fossilized tooth
fossil
Banded calcite (travertine or calcite-rich carbonate)
Calcite, CaCO₃; likely banded travertine or recrystallized limestone
sedimentary
Glauconitic Sandstone
Glauconite (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2 in Quartz Sandstone
sedimentary
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Sandstone (Glauconitic)
Glauconitic Quartz Sandstone (SiO2 + (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Pink shell fragment
Calcium carbonate, likely aragonite or calcite (CaCO₃); probably a bivalve or gastropod shell fragment
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Green Jasper
Microcrystalline Quartz (Chalcedony), SiO2
sedimentary
Petrified Wood
Silicified Wood (Permineralized organic tissue)
fossil
Limestone with Calcite Veining
Sedimentary Rock (Calcium Carbonate, CaCO3)
sedimentary
Fossilized Wood (Petrified Wood) and Associated Rocks
Silicified Wood / Xylopal
fossil
Petrified Wood
Silicified wood (primarily SiO2)
fossil
Fossil Coral
Scleractinia (Fossilized Coral) / Calcium Carbonate (CaCO3) or Silica (SiO2)
fossil
Amber
Succinite (organic mineraloid); Chemical formula: C10H16O
mineral
Amber
Succinite / Fossilized Tree Resin
fossil
Banded Chert / Flint Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Moss Agate
Agate (Silicon Dioxide, SiO2) with dendritic inclusions
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Calcite crystal cluster
Calcite (calcium carbonate, CaCO₃)
mineral
Tumbled banded agate (likely chalcedony)
Microcrystalline quartz, SiO₂; probable banded chalcedony/agate
mineral
Honey calcite (yellow calcite)
Calcite, calcium carbonate (CaCO₃)
mineral
Polished amber-colored stone, possibly chert or jasper
Uncertain from image; likely microcrystalline quartz (SiO₂) if chert/jasper
mineral
Amber
Succiniferous fossil resin (C10H16O)
mineral
Graphite
Graphite (Carbon, C)
mineral