Granite
Granite (Silicic Intrusive Igneous Rock)
Igneous
Category
Man Made Rock Like Material
Browse man made rock like material specimens identified by the Rock Identifier community.
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Opalite
Synthetic glass (SiO2 + metal additions)
mineraloid
Sandstone
Arenite (specifically sublithic or quartz arenite)
sedimentary
Sandstone
Arenite (mostly SiO2)
sedimentary
Probable amber fragment
Amber (fossilized plant resin; chiefly amorphous organic resin, commonly dominated by succinite)
gemstone
Chert (Cherty Shale / Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone (Quartzose)
Arenite (composed primarily of SiO2)
sedimentary
Vesicular Basalt (or Scoria)
Vesicular Basalt
igneous
Granite
Granite (phaneritic intrusive igneous rock consisting of quartz, feldspar, and mica)
igneous
Chert (often called Flint or River Stone)
Microcrystalline alpha-quartz (SiO2)
sedimentary
Bauxite
Bauxite (Al(OH)3, AlO(OH))
sedimentary
Raw quartz crystal
Quartz (silicon dioxide, SiO₂), likely milky or included quartz
mineral
Carved yellow stone butterfly
Undetermined; possibly carved soapstone (talc-rich rock) or another soft ornamental stone
mineral
Granodiorite
Intrusive Igneous Rock
igneous
Eroded Brick or Pumice-like Scoria
Vesicular Basalt / Scoria (Anthropogenic variant: Eroded Firebrick)
igneous
Metallic sulfide mineral fragment, likely galena
Galena (lead sulfide, PbS), tentative identification
mineral
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Mixed quartz gemstone bead bracelet
Quartz, silicon dioxide (SiO₂), in varieties including smoky quartz, amethyst, rutilated quartz, and possibly tourmalinated quartz
gemstone
Opalite
Synthetic Opalised Glass
Mineral (Synthetic / Man-made)
Goldstone
Avventurina (Cu + SiO2 glass)
mineral
Tree Agate
Chalcedony (SiO2)
gemstone
Terracotta (Man-made ceramic brick fragment)
Baked clay / High-iron ceramic (Silicate-based ceramic)
Anthropogenic material (Man-made sedimentary mimic)
Man-made Green Quartz (Lab-grown or Treated)
Silicon Dioxide (SiO2) with artificial coloration
mineral
Granite
Phaneritic Igneous Rock (composed mostly of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Flint (chert) nodule
Microcrystalline quartz (SiO₂), occurring as a flint/chert nodule in limestone
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Obsidian
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Polished orbicular granite heart
Granite, commonly quartz–alkali feldspar–plagioclase–biotite granite; exact locality-dependent
igneous
Red coral (likely precious coral)
Corallium sp.; calcium-carbonate skeleton, primarily calcite
gemstone
Pumice or vesicular volcanic tuff
Pumice: highly vesicular volcanic glass, chiefly rhyolitic to dacitic; possible tuff: lithified ash and pumice fragments
igneous
Chert (flint) fragment
Microcrystalline quartz (SiO₂), commonly called chert or flint
sedimentary
Red Sandstone
Quartz Arenite (iron-stained) / SiO2
sedimentary
Red Sandstone
Arenite (Iron-rich)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Trilobite fossil
Trilobita (exact species indeterminable from the image)
fossil
Synthetic Faux Fur Fursuit
Polyacrylonitrile / Polyester (Synthetic Textile)
not a rock (synthetic material/costume)
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chalcedony (Agate/Chert variety)
Silicon Dioxide (SiO2)
mineral