Tektite (Indochinite)
Natural glass (High-silica impact glass)
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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Small polished pink-and-white mineral pebble
Likely rose quartz or pale pink quartz; exact identification is uncertain from the image
mineral
Diamond (Princess Cut Gemstone)
Carbon (C)
mineral
Tumbled blue stone, likely blue aventurine or dyed quartzite
Quartz (SiO₂), likely with inclusions or artificial dye; exact identification requires testing
mineral
Sandstone (with Moss/Lichen Growth)
Sandstone (Quartz Arenite / Lithic Arenite)
sedimentary
Turquoise cabochon jewelry
Turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O
gemstone
Smoky Quartz and Chalcedony Geode Fragment
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Diamond
Diamond (pure carbon C)
mineral
Sandstone (Pebble)
Arenite (primarily SiO2)
sedimentary
River Cobble (Quartzite)
Meta-orthoquartzite
metamorphic
Sandstone
Arenite
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Turquoise (likely stabilized or simulated Howlite)
CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)
mineral
Quartz (Smoky Quartz variant)
Silicon Dioxide (SiO2)
mineral
Orange Calcite (or Yellow Calcite)
Calcium Carbonate (CaCO3)
mineral
Sandstone (Quartzite-rich)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (Heart-shaped pebble)
Sedimentary Quartz Sandstone
sedimentary
Quartz (Water-worn pebble)
Silicon Dioxide (SiO2)
mineral
Chalcedony (or a variety of Chalcedony, likely Agate or Jasper)
Chalcedony (SiO₂)
Mineral (or mineraloid if microcrystalline)
Amethyst geode/druse
Quartz, SiO₂; purple variety amethyst
mineral
Sandstone (Sedimentary Rock)
Arenite (SiO2 based)
sedimentary
Sandstone (Micaceous)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (likely Quartzose Sandstone)
Arenite (SiO2 based)
sedimentary
Fossiliferous Limestone with Crinoid Stem
Sedimentary Rock with Echinodermata fossil fragment
fossil
Vesicular Basalt (or Scoria)
Vesicular Basalt
igneous
Sandstone (Pebble)
Arenite (SiO2 based)
sedimentary
Chert (Green and Black Jasper variant)
Cryptocrystalline Quartz (SiO2)
sedimentary
Sedimentary Sandstone (Sandstone Slab)
Arenite (SiO2 with Fe2O3 staining)
sedimentary
Smoky Quartz with Hematite inclusions
Silicon Dioxide (SiO2) with Fe2O3 inclusions
mineral
Iron-stained quartz-rich rock, possibly goethite-bearing quartz
Quartz (SiO₂) with iron oxides/hydroxides, likely goethite or limonite
mineral
Granite (Weathered River Rock)
Plutonic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Quartz with Pyrite and Lichen
Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)
mineral
Quartz Geode
Silicon Dioxide (SiO2) in sedimentary host rock
sedimentary
Sandstone
Arenite (Sedimentary rock composed of sand-sized grains)
sedimentary
Quartz geode
Quartz (SiO₂), likely drusy/microcrystalline quartz lining a geode cavity
mineral
Shale
Fissile Mudstone
sedimentary
Milky quartz (massive quartz)
Quartz, silicon dioxide (SiO₂)
mineral
Likely blue glass or synthetic gemstone jewelry
Uncertain; possibly synthetic spinel, cubic zirconia, or blue glass
gemstone
Sandstone
Arenite (SiO2 based with various mineral cements)
sedimentary
Granite
Granite (composed primarily of Quartz SiO2, Potassium Feldspar KAlSi3O8, and Plagioclase Feldspar)
igneous
Sandstone
Arenite (SiO2 dominant)
sedimentary