Polygenetic Breccia
Clastic Breccia (containing lithic fragments in a fine-grained matrix)
sedimentary
Category
Man Made Material (Anthro Lithic Product)
Browse man made material (anthro lithic product) specimens identified by the Rock Identifier community.
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Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Flint
Silicon dioxide (SiO2)
sedimentary
Quartz (Microcrystalline/Chert)
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Silicon dioxide (SiO2)
sedimentary
Chert (Flint)
Silicon dioxide (SiO2)
sedimentary
Goldstone (Synthetic Aventurescence Glass)
Cuprous Aventurescent Glass (Silicon Dioxide with Copper inclusions)
mineraloid / man-made material
Pearl and Garnet Glass
Calcium Carbonate (CaCO3) for pearl; Silicon Dioxide (SiO2) for glass
mineral and glass
Slag (Industrial Glass/Metal)
Ferrous slag or Glassy silicate byproduct
Antropogenic rock (Man-made)
Tektite
Natural impact glass
meteorite
Chert (often called Flint or Jasper if reddish)
Microcrystalline Quartz (SiO2)
sedimentary
Coquina
Coquina (Biogenic Limestone / CaCO3)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Probable amber fragment
Amber (fossilized plant resin; chiefly amorphous organic resin, commonly dominated by succinite)
gemstone
Chalk
Calcite (CaCO3)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Pumice
Pumice (Vesicular Felsic to Intermediate Volcanic Rock)
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Polished greenstone pebble
Likely nephrite jade (tremolite–actinolite), though serpentine or greenstone is possible from appearance alone
metamorphic
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Silica (SiO2)
sedimentary
Cobalt Glass Slug (Man-made Glass)
Amorphous Silica with Cobalt Oxide (SiO2 + CoO)
mineraloid
Rounded brown river pebble
Indeterminate lithic fragment; possibly weathered sandstone, mudstone, or basalt
sedimentary
Chalk
Carbonate rock (mainly CaCO3)
sedimentary
Coquina
Biogenic Limestone (Coquina)
sedimentary
Sandstone
Arenite (SiO2 composition dominant)
sedimentary
Sandstone (Quartz Arenite)
Sandstone (dominated by SiO2 quartz grains)
sedimentary
Tumbled epidote-bearing rock (likely epidote–quartz–feldspar aggregate)
Epidote-rich metamorphic rock; minerals likely epidote (Ca₂(Al,Fe)₃Si₃O₁₂(OH), quartz, feldspar, and dark amphibole/biotite)
metamorphic
Quartzite
Metamorphic quartz rock (SiO2)
metamorphic
Beach Pebble (Chalcedony / Chert)
Silicon Dioxide (SiO2)
mineral
Weathered jasper-rich ironstone
Brecciated jasper/chert with iron oxides and hydroxides (SiO₂ with hematite, goethite, and limonite)
sedimentary
Chert (varieties include Flint and Mudstone)
Microcrystalline Silica (SiO2)
sedimentary
Sandstone
Arenite (with iron oxide cement)
sedimentary
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (often called Flint or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
N/A - Man-made object (Jewelry Chain)
Antiqued or Oxidized Metal Chain (often Steel or Brass)
Mineral (processed metal)
Man-made Jewelry Charm (Enameled Metal)
Not a natural mineral; composed of base metal alloy (likely zinc or brass) and epoxy resin/enamel.
Synthetic / Manufactured Artifact
Sandstone
Arenite
sedimentary
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Yellow Jasper/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Nodule)
Chert (Alpha-Quartz, SiO2)
sedimentary