Green Aura Quartz
Silicon Dioxide (SiO2) bonded with metallic vapors (typically Gold, Chromium, or Titanium)
mineral
Category
Man Made Material, Not A Natural Rock Or Mineral Specimen
Browse man made material, not a natural rock or mineral specimen specimens identified by the Rock Identifier community.
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Howlite (Dyed Turquoise)
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
mineral
Sandstone
Sedimentary Rock (Quartz arenite / Lithic sandstone)
sedimentary
Dark river pebble, likely basalt or fine-grained volcanic rock
Basalt (probable); mostly plagioclase and pyroxene, with possible magnetite
igneous
Quartz Sandstone Pebble
Sandstone (SiO2 dominated)
sedimentary
Smoky Quartz with Chert
Silicon Dioxide (SiO2)
mineral
Sandstone (with vugs or solution cavities)
Arenite (primarily Quartz and Feldspar with CaCO3 or SiO2 cement)
sedimentary
Fossil bivalve shell
Likely an extinct or modern-like ribbed cockle/scallop; exact genus requires locality and diagnostic hinge features
fossil
Red Sandstone
Quartz Arenite (iron-stained) / SiO2
sedimentary
Chert Arrowhead
Chert (Cryptocrystalline variety of Quartz, SiO2)
sedimentary
Chert (Flint/Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Diamond (or Diamond Simulant)
Carbon (C)
gemstone
Sandstone
Arenite (Silicon Dioxide, SiO2 based)
sedimentary
Sandstone Pebble
Arenite (Sandstone)
sedimentary
Pyrite Concretion (Grapestone)
Iron Sulfide (FeS2) Concretion
sedimentary
Sandstone
Arenite (primarily Quartz Arenite)
sedimentary
Quartz-bearing conglomeratic rock with orange feldspar/calcite inclusion
Probably porphyritic granite or granitic pegmatite; exact identification requires a thin section or tests
igneous
Chalcedony (Agate/Chert variety)
Silicon Dioxide (SiO2)
mineral
Greenish translucent mineral fragment
Indeterminate; possibly serpentine, epidote, or green glassy feldspar
mineral
Sandstone
Sandstone (clastic sedimentary rock composite)
sedimentary
Lazulite Quartzite
Quartzite with Lazulite (SiO2 with (Mg,Fe)Al2(PO4)2(OH)2)
metamorphic
Jasper and Epidote in Quartzite
Metamorphic rock containing microcrystalline quartz, epidote, and jasper
metamorphic
Agate
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Sandstone (composed predominantly of Quartz, SiO2, with Feldspar and Clay minerals)
sedimentary
Opalite
Man-made synthetic glass with opalescent effects (SiO2 + metal oxides)
mineraloid
Granite Cobble / Gneiss (River Rock)
Granitic Gneiss / Felsic Igneous Rock
igneous
Orgonite Pyramid (containing Amethyst and mixed minerals)
Silicon Dioxide (SiO2) in synthetic resin
gemstone
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone
Arenite
sedimentary
Quartz Druzy on Agate (River Cobble)
Silicon Dioxide (SiO2)
Mineral / Sedimentary (often associated with volcanic hosts)
Riverstone (Sandstone Pebble)
Arenite (SiO2 with various lithic fragments)
sedimentary
Chert (White Chert/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone with Dendritic Inclusions
Quartzose Sandstone
sedimentary
Herkimer Diamond
Quartz (Silicon Dioxide) - SiO2
mineral
Coal (Anthracite / Bituminous)
Organic Sedimentary Rock (Carbon-based)
sedimentary
Chert (Yellow Jasper/Flint)
Silicon Dioxide (SiO2)
sedimentary
Banded Calcite or Travertine
Calcium Carbonate (CaCO3)
Sedimentary
Sandstone
Arenite (SiO2 principal composition)
sedimentary
Weathered fossiliferous limestone fragment, possibly fossil coral or shell material
Indeterminate carbonate fossil in calcitic limestone; likely composed mainly of calcite (CaCO₃), but species identification is not possible from this image alone
fossil
Tumbled sodalite with white calcite veining
Sodalite, Na8(Al6Si6O24)Cl2, commonly intergrown with calcite, CaCO3
mineral
Note: Item is a Synthetic/Man-made Object
Titanium-coated Stainless Steel (Fe-Cr-Ni-Ti)
Non-geological
Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary