Sandstone
Arenite
sedimentary
Category
Man Made Material
Browse man made material specimens identified by the Rock Identifier community.
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Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Probable amber fragment
Amber (fossilized plant resin; chiefly amorphous organic resin, commonly dominated by succinite)
gemstone
Luminous Stone (Glow-in-the-dark Synthetic/Man-made Stone)
Strontium Aluminate tinted glass or resin (Crystalline silicate/oxide mix)
mineral (synthetic)
Quartzite
Metamorphic quartz rock (SiO2)
metamorphic
Carnelian cabochon pendant
Carnelian, orange-red chalcedony (microcrystalline quartz, SiO₂)
gemstone
Terrazzo (Synthetic Composite Rock)
Cementitious or Epoxy Resin-bound Aggregates
Man-made metamorphic-style composite
Weathered fossil shell fragment
Indeterminate bioclastic carbonate, likely molluscan shell (calcium carbonate, commonly aragonite or calcite)
fossil
Jade bangle
Likely nephrite jade (actinolite–tremolite amphibole); possibly jadeite
gemstone
Chert (Flint)
Microcrystalline Silica (SiO2)
sedimentary
Carved serpentine pendant
Serpentine-group minerals, commonly antigorite/lizardite (Mg₃Si₂O₅(OH)₄), possibly mixed with chlorite or other inclusions
mineral
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
Sandstone (Quartz Arenite)
Sandstone (dominated by SiO2 quartz grains)
sedimentary
Sandstone
Arenite (with iron oxide cement)
sedimentary
Blue faceted gemstone, likely synthetic sapphire or blue glass
Corundum (Al₂O₃) if sapphire; identity cannot be confirmed visually
gemstone
Malaysian 50 Sen Coin
Coinage (specific alloy unknown without metallurgical analysis, but typically brass or bronze for this denomination and era)
Man-made object (coin)
Tumbled chalcedony (likely milky quartz)
Microcrystalline quartz, SiO₂; possibly pale agate or quartzite
mineral
Engineered Quartz Stone
Agglomerated Quartz (SiO2 + Polymer Resin)
mineral-based composite
Coquina
Bioclastic Limestone
sedimentary
Sandstone
Arenite (SiO2 composition dominant)
sedimentary
Chert (Flint Arrowhead)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Chert (often called Flint or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Concrete-like aggregate surface with embedded rock fragments
Anthropogenic concrete or exposed aggregate; not a natural rock specimen
sedimentary
Galena (lead sulfide)
Galena, PbS
mineral
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Beach Pebble (Chalcedony / Chert)
Silicon Dioxide (SiO2)
mineral
Tumbled brown chalcedony or agate
Microcrystalline quartz (SiO₂), likely chalcedony; possibly iron-stained jasper or agate
gemstone
Chert (varietal Flint)
Microcrystalline quartz (SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Chert (Common Variety, Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Yellow Jasper/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Nodule)
Chert (Alpha-Quartz, SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone Pebble
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Likely banded obsidian or dark volcanic glass
Obsidian, predominantly rhyolitic volcanic glass (SiO₂-rich), possibly with devitrified bands and phenocrysts
igneous
Tumbled chalcedony or quartz pebble
Microcrystalline quartz (SiO₂), likely orange chalcedony/carnelian
mineral
Diorite (Gneissic)
Diorite
igneous
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Granite
Granite (Mainly Quartz SiO2, Feldspar KAlSi3O8, and Mica KAl2(AlSi3O10)(OH)2)
Igneous