Rainbow Hematite Ring
Iron(III) oxide (Fe2O3) with thin-film coating
mineral
Category
Not A Rock (Man Made Polymer)
Browse not a rock (man made polymer) specimens identified by the Rock Identifier community.
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Concrete with Aggregate
Artificial Conglomerate (Cement and Aggregate)
sedimentary
Opalite
Opalescent Glass (SiO2 + coloring agents)
Mineral (Synthetic/Man-made)
Red glassy gemstone, possibly garnet
Unidentified red transparent material; garnet group (X₃Y₂(SiO₄)₃) is a possibility
gemstone
Colorless quartz crystal (likely quartz fragment)
Quartz, silicon dioxide (SiO₂)
mineral
Milky quartz (likely)
Quartz, silicon dioxide (SiO₂)
mineral
Tumbled black stone, likely black obsidian
Obsidian (volcanic glass; chiefly silica-rich rhyolitic composition)
igneous
Synthetic Costume Glove (Paws)
Polyethylene terephthalate (Polyester) & Polyurethane blend
Non-geological / Man-made textile
Polymictic conglomerate or breccia (possibly concrete-like aggregate)
Lithified polymictic gravel; clasts may include basalt, granite, quartzite, and other silicates
sedimentary
Polished blue glassy mineral specimen, likely sodalite or blue aventurine
Most consistent with sodalite (Na₈Al₆Si₆O₂₄Cl₂), though dyed quartzite or blue glass cannot be excluded from the photograph
mineral
Cubic Zirconia (Jewelry Setting)
Zirconium Dioxide (ZrO2)
gemstone
Diamond
Native Carbon (C)
mineral
Blue Slag Glass
Anthropogenic Amorphous Silicon Dioxide
mineral
Blue glassy gemstone-like specimen
Indeterminate; possibly dyed or treated turquoise, blue apatite, or man-made glass
gemstone
Green Aventurine
Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Blue Goldstone
Synthetic glass with cobalt and copper inclusions
man-made glass
Cubic Zirconia (Jewelry Setting)
Cubic Zirconia (ZrO2)
gemstone
Aluminum Slag
Anthropogenic Aluminum (Al)
mineral
Cullet (Slag Glass)
Amorphous Silica (SiO2) with various metal oxide colorants
mineraloid / anthropogenic
Sea Glass
Amorphous silicon dioxide (man-made glass weathered by nature)
mineral
Sea Glass
Man-made silicate glass (Amorphous silicon dioxide)
sedimentary
Man-made Blank Ammunition (Brass)
CuZn (Cartridge Brass - roughly 70% Copper, 30% Zinc)
Anticrystalline / Synthetic Alloy
Likely tumbled red mineral or glass imitation
Indeterminate; possibilities include red jasper (microcrystalline quartz, SiO₂) or dyed chalcedony
mineral
Agate and millefiori glass jewelry
Agate: microcrystalline quartz (SiO₂); millefiori element appears to be man-made glass
mineral
Smelter Slag
Anthropogenic Silicate Slag
igneous
Green sea glass (likely slag glass or bottle glass)
Man-made soda-lime silicate glass; not a naturally occurring mineral
mineral
Titanium Aura Quartz
Silicon Dioxide (SiO2) coated with Titanium and Niobium
mineral
Concretion with Geode Cavity
Ferruginous Sandstone Concretion with Quartz Center
sedimentary
Concrete fragment or Conglomerate
Artificial Conglomerate (Concrete) or Natural Conglomerate
sedimentary
Sea Glass
Man-made vitreous material (silica-based glass)
mineral
Sea Glass
Man-made vitreous material (silica glass)
sedimentary
Goldstone
Man-made glass infused with metallic copper
gemstone
Opalite
Man-made Glass (Synthetic Opalized Glass)
gemstone
Sea Glass
Man-made silicate glass weathering product
sedimentary
Opalite
Synthetic Glass / Man-made Opal Simulant
gemstone
Goldstone
Avventurina (Man-made Glass with Copper inclusions)
mineral
Opalite
Synthetic Opalized Glass / Man-made Glass
gemstone
Opalite
Man-made glass (traditionally simulated Opal)
mineral
Tumbled milky quartz pebble
Quartz (silicon dioxide, SiO₂), opaque-to-translucent milky variety
mineral
Goldstone
Man-made glass infused with copper crystals
mineral
Blue Sandstone
Man-made glass with cobalt and copper inclusions
gemstone
Goldstone
Man-made glass containing cuprous oxide
gemstone