Graphite-bearing schist (probable)
Graphite–quartz–mica schist; chiefly graphite (C), quartz (SiO₂), and mica
metamorphic
Category
Organic Material (Likely A Fruit Or Berry)
Browse organic material (likely a fruit or berry) specimens identified by the Rock Identifier community.
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Petrified Wood
Silicified wood (Quartz replacement, SiO2)
fossil
Petrified Wood
Silicified Wood (Permineralized wood)
fossil
Amber
Succinited (C10H16O)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossiliferous Limestone
Carbonate Rock (CaCO3 with organic inclusions)
sedimentary
Gastropod shell fragment
Calcareous mollusk shell; primarily aragonite or calcite (CaCO₃)
fossil
Chert (Agatized/Chalcedony variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Iron-stained)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Black Limestone with Calcite Veins
Limestone (Calcium Carbonate, CaCO3)
sedimentary
Fossilized Bone
Permineralized Vertebrate Bone
fossil
Shungite
Non-crystalline carbonoid (Shungite)
metamorphic
Pyrite in Shale
Iron Disulfide (FeS2)
mineral
Fossiliferous Limestone
Fossiliferous Limestone (CaCO3)
sedimentary
Mixed Gemstone and Mineral Collection
Silicon Dioxide (SiO2) based minerals and others
mineral
Beaded Jewelry (Assorted Gemstones)
Various minerals, including but not limited to Quartz (SiO2), Garnet (X3Y2(SiO4)3), Jade (Na(Al,Fe)Si2O6), Amethyst (SiO2),等の多様な組み合わせ
Mineral, Jewelry
Brown Jasper (Likely)
Jasper (Cryptocrystalline Silicon Dioxide - SiO2)
Mineral
Fossilized Bone
Vertebrate fossil (mineralized bone)
fossil
Fossilized Shell in Limestone
Carbonate sedimentary rock with Bivalvia or Brachiopoda remains
fossil
Amber
Succiniferous organic material (Succinite)
fossil
Petrified Wood
Petrified Wood (Silicified Wood)
fossil
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Bone Fragment
Vertebrate Fossil
fossil
Fossiliferous Limestone
Fossiliferous Limestone (containing bioclasts)
sedimentary
Fossiliferous Limestone
Calcareous biomicrite / Calcium Carbonate (CaCO3)
sedimentary
Amber
Succinite
Organic mineraloid
Mother of Pearl (Nacre)
Aragonite (CaCO3) with Organic Matrix
mineral
Fossilized Bone
Petrified Bone / Biogenic Sedimentary
fossil
Yellow Chert
Sedimentary cryptocrystalline quartz (SiO2)
sedimentary
Fossil Shark Tooth
Chondrichthyes (Class)
fossil
Limestone and Quartz Gravel with Petrified Wood
Sedimentary gravel aggregate and fossilized wood
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Black Onyx and Mother of Pearl
Cryptocrystalline Quartz (SiO2) and Nacre (Calcium Carbonate)
mineral
Jasper
Silicon dioxide (SiO2)
sedimentary
Amber
Succinite
Mineraloid
Quartz Pebble (with Iron Inclusions)
Silicon Dioxide (SiO2)
mineral
Fossiliferous Rock (likely Dinosaur Fossil in Matrix)
Permineralized Vertebrate Fossil (Calcium Carbonate/Silica replaced bone material)
sedimentary
Carved Mottled Greenish-Yellow Crystal/Glass Object
Unknown; possibly a form of quartz (chalcedony/jadeite/nephrite) or glass/resin.
Man-made Object/Uncertain Mineral
Tumbled green gemstone, likely dyed howlite or serpentine
Most consistent with dyed howlite (Ca2B5SiO9(OH)5); exact identification requires testing
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Unidentified Dark Mineral or Rock
Indeterminate (Likely Silicon Dioxide or Carbon-based)
mineral
Chert (Tan/Yellow variety)
Microcrystalline Quartz (SiO2)
sedimentary