Pyrite
Iron Sulfide (FeS2)
mineral
Category
Anthropogenic (Man Made Material Processed By Nature)
Browse anthropogenic (man made material processed by nature) specimens identified by the Rock Identifier community.
Learn about Anthropogenic (Man Made Material Processed By Nature) in the encyclopedia
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Mammoth or Mastodon Tooth Fragment
Mammuthus / Mammut molar fragment
fossil
Shark Tooth Fossil
Carcharocles megalodon or similar fossilized shark tooth
fossil
Abalone Shell (Nacre)
Aragonite (CaCO3) - Biogenic Mineral
mineral
Blue Dyed Agate
Chalcedony (cryptocrystalline variety of Quartz), SiO2
mineral
River Cobble (Quartzite or Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Chert (Flint Nodule)
Microcrystalline or cryptocrystalline quartz (SiO2)
sedimentary
Gold Nugget
Native Gold (Au)
mineral
Diamond (or Cubic Zirconia simulant)
Carbon (C) or Zirconium Dioxide (ZrO2)
mineral
Yellow Quartz Pebble (Citrine Quartz / Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Mammoth or Mastodon Tooth Fossil
Mammuthus / Mammut tooth
fossil
Shark Tooth Fossil
Vertebrate fossilized tooth (Chondrichthyes)
fossil
Shark Tooth Fossil
Vertebrate fossilized tooth
fossil
Chakra Stone Bracelet
Mixed Mineral Assembly (Scoria, Amethyst, Lapis Lazuli, Turquoise/Howlite, Impression Jasper, Tiger's Eye, Carnelian, Red Jasper)
igneous, metamorphic, and sedimentary
Slag (Industrial Byproduct)
Ferrous/Non-ferrous Silicate
igneous (artificial/anthropogenic)
Petrified Wood
Silicified wood (primarily SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Chrysocolla on Matrix
Hydrated copper silicates ((Cu,Al)2H2Si2O5(OH)4·nH2O)
mineral
Shale
Shale (clastic sedimentary rock)
Sedimentary
River Cobble (likely Sandstone or Siltstone type)
Sandstone or Siltstone (common rock types that form river cobbles)
Sedimentary Rock (specifically a clastic sedimentary rock formed into a cobble)
Chert (or Flint)
Chert (cryptocrystalline quartz), SiO2
Sedimentary
Red Jasper (Tumbled)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Fossiliferous Limestone (Coquina / Shell Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Fossiliferous Sandstone (with Quartz patch)
Sedimentary Sandstone with Silicified Shell Fragments
sedimentary
Petrified Wood
Silicified Wood (SiO2)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Zebra Marble
Metamorphosed Limestone (Recrystallized Calcite)
metamorphic
Sandstone (Pebble)
Arenite (primarily SiO2)
sedimentary
![Green Apatite on Albite (Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]) — mineral](https://media.rockidentification.com/2391a63f-fb20-47d5-af9a-2035851eb32e-thumbnail.jpg)
Green Apatite on Albite
Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]
mineral
Fossil Shark Tooth
Chondrichthyes (class)
fossil
Fossil Shark Tooth
Chondrichthyes (class)
fossil
Fossil Shell
Invertebrate fossil (Mollusca)
fossil
Fossil Shark Tooth
Odontaspididae (likely Carcharias sp.)
fossil
Green Druzy Quartz (Prasiolite)
Silicon Dioxide (SiO2) with inclusions (typically Chlorite or Actinolite)
mineral
Fossil Coral
Scleractinia (Fossilized Coral)
fossil
Quartz Vein in River Siltstone
Crystalline Quartz (SiO2) in Siliclastic Matrix
sedimentary
Blue Quartz (Dumortierite Quartz)
Quartz (SiO2) with inclusions of Dumortierite (Al7(BO3)(SiO4)3O3)
mineral
Seashell Fossil
Gastropoda fossil
fossil
Fossil Shark Tooth
Chondrichthyes (Class)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Shark Tooth Fossil
Carcharodonta (order Lamniformes), likely Carcharias spp.
fossil