Opalite
Man-made synthetic glass with opalescent effects (SiO2 + metal oxides)
mineraloid
Category
Mineraloid (Man Made Origin)
Browse mineraloid (man made origin) specimens identified by the Rock Identifier community.
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One Pound Coin (UK)
Nickel-Brass Alloy (Cu-Zn-Ni)
mineral
Jet
Lignite (Anthracite-grade compact coal)
sedimentary
Man-made Metal Pin (Non-geological)
Antimony-Lead Alloy or Zinc/Brass Base with Electroplating
Metal Alloy / Manufactured Artifact
Goldstone (Brown)
Aventurine Glass (Silicon Dioxide infused with Copper crystals)
mineraloid (man-made glass)
Green Glass (often marketed as 'Obsidian' or 'Green Quartz')
Amorphous Silica (SiO2) with copper or chromium additives
Mineraloid (Man-made)
Opalite
Synthetically produced glass (Silicon Dioxide with metallic inclusions)
Mineraloid (Man-made Glass)
ABS Plastic (Acrylonitrile Butadiene Styrene)
(C8H8)x·(C4H6)y·(C3H3N)z
Synthetic Polymer (Synthetic Material)
Opalite
Synthetic Opalized Glass
mineraloid (man-made)
Opalite
Synthetic Opalite Glass (Silicon Dioxide)
mineraloid (man-made)
Metal Chain Belt with Square Plates
Not applicable (man-made)
Man-made Object (Metalwork)
Not a geological specimen
N/A (man-made object)
N/A
Cobalt Glass Slug (Man-made Glass)
Amorphous Silica with Cobalt Oxide (SiO2 + CoO)
mineraloid
Red Slag Glass
Amorphous Silica (Industrial byproduct with metallic oxide dopants)
Mineraloid / Industrial Byproduct
Green Sea Glass
Amorphous Silica (man-made glass), SiO2 + additive metal oxides
mineraloid / anthropogenic (man-made origin)
Carved Mottled Greenish-Yellow Crystal/Glass Object
Unknown; possibly a form of quartz (chalcedony/jadeite/nephrite) or glass/resin.
Man-made Object/Uncertain Mineral
Cullet Glass (sometimes mistaken for Blue Obsidian or Slag)
Amorphous Silicon Dioxide (SiO2) with chemical additives (e.g., Cobalt for blue color)
mineraloid / industrial byproduct
Tektite (Indochinite)
Tektite (SiO2 + Al2O3)
mineraloid
Sea Glass (specifically Frosted White)
Amorphous Silica (substance: Sodium-calcium silicate glass)
Mineraloid (Anthropogenic/Man-made rock)
Goldstone
Aventurine glass (Synthetic glass with copper inclusions)
mineraloid / man-made glass
Concrete Fragment
Artificial Conglomerate (Cement and Aggregate)
sedimentary
Amber
Succiniferous fossil resin (C10H16O)
mineraloid
Blue Sapphire (Synthetic or Man-made Glass Imitation)
Corundum (Al2O3) if natural; Lead-glass or Spinal if synthetic
mineral
Quartz pebble (Quartztite fragment)
Silicon Dioxide (SiO2)
mineral
Amber
Succinite (Fossilized Tree Resin)
mineraloid
Goldstone
Aventurine Glass (Man-made glass with copper inclusions)
mineraloid / man-made glass
Stainless Steel (Polished)
Ferrous Alloy containing Iron (Fe), Chromium (Cr), and Carbon (C)
Mineral equivalent / Metal Alloy
Black Obsidian
Obsidian (Volcanic Glass, SiO2 + impurities)
igneous
Concrete Fragment
Hardened Portland cement and mineral aggregate
sedimentary (anthropogenic)
Man-made Glass (Tumbled/Shaped)
Amorphous Silicon Dioxide (SiO2) with metal oxide colorants
Mineraloid (synthetic)
Pearl
Aragonite / Calcium Carbonate (CaCO3)
mineral
Exposed Aggregate Concrete (Pea Gravel)
Concrete with Siliceous Alluvial Gravels
sedimentary (man-made conglomerate)
Vesicular Basalt (or Scoria)
Vesicular Basalt
igneous
Amber
Succinite (with a generalized formula of C10H16O)
mineral
Titanium-coated Metal Cube (Man-made Fidget Toy)
Titanium-anodized or electroplated alloy (e.g., Ti-coated Zinc or Aluminum)
Mineral alternative / Synthetic
Opalite
Man-made opalized glass
mineral
Goldstone
Aventurine Glass (Man-made)
mineral
Slag Glass
Amorphous Silicate (Man-made)
industrial byproduct
Asphalt Concrete
Bituminous conglomerate
sedimentary
Slag (Industrial Byproduct)
Artificial silicate/iron byproduct
Mineral description (Anthropogenic material)
Goldstone (Red/Brown)
Aventurine Glass (SiO2 with Copper inclusions)
Mineral (Man-made glass)
Asphalt (Road Aggregate)
Bituminous conglomerate
sedimentary