Opalite (Man-made Glass)
Fused glass (typically made of dolomite and metal opacifiers)
Man-made Material / Glass
Category
Anthropogenic Mineral Mimic
Browse anthropogenic mineral mimic specimens identified by the Rock Identifier community.
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Concrete Fragment
Hardened Portland Cement Composite
Anthropogenic (Man-made material mimicking sedimentary rock)
Iron Slag
Vitreous glassy waste (Fe-Si-Al-Ca compounds)
Mineral byproduct (anthropogenic / techno-fossil)
Concrete with Aggregate
Composite construction material; primary matrix is Calcium Silicate Hydrate (C-S-H)
anthropogenic (human-made) sedimentary-like material
Slag Glass
Amorphous Silica / Glass Slag
industrial byproduct (anthropogenic rock-like material)
Sea Glass (Teal/Turquoise)
Amorphous Silica (SiO2) with trace metal oxides
Anthropogenic (Man-made material processed by nature)
Bumblebee Jasper
Fibrous Calcite with Sulfur, Arsenic, and Volcanic Ash
mineral
Pearl and Garnet Glass
Calcium Carbonate (CaCO3) for pearl; Silicon Dioxide (SiO2) for glass
mineral and glass
Opalite (Man-made Glass)
Synthetic Opalised Glass
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz (Rose Quartz or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Picture Jasper
Silicified sedimentary or volcanic rock (primarily SiO2)
sedimentary
Banded Agate Geode
Silicon Dioxide (SiO2)
mineral
Goldstone
Not a natural mineral or rock. It is an ornamental glass.
Manufactured Glass (Simulant)
Obsidian Arrowhead
Obsidian (Volcanic Glass)
igneous
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Dyed Cracked Agate
Silicon Dioxide (Quartz variety, SiO2)
gemstone
Orca Agate
Chalcedony (SiO2) with various inclusions
mineral
Red Sandstone
Arenite (primarily Quartz with Hematite cement, SiO2 with Fe2O3)
sedimentary
Ironstone Concretion
Ironstone (primarily Siderite or Limonite)
sedimentary
Bumblebee Jasper
Fibrous Calcite and Quartz with Volcanic Matter (CaCO3 / SiO2)
mineral
Opalite
Synthetic Glass (Silica-based)
gemstone
Concrete with Aggregate
Artificial Conglomerate (Cement and Aggregate)
sedimentary
Moissanite
Silicon Carbide (SiC)
mineral
Opalite
Synthetically produced glass (Silicon Dioxide with metallic inclusions)
Mineraloid (Man-made Glass)
Aventurine
Silicon Dioxide (SiO2 with inclusions of Fuchsite mica)
mineral
Tiger's Eye
Silicon Dioxide (Quartz pseudomorph after crocidolite), $SiO_2$
mineral
Heat-Treated Citrine (Amethyst)
Silicon Dioxide (SiO2) with iron impurities
mineral
Green Aventurine
Silicon dioxide (SiO2) with fuchsite inclusions
mineral
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite mica
metamorphic
Eagle Eye Stone (Gray-Blue Tiger's Eye)
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Quartz Geode (Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Sandstone (with Liesegang rings or joints)
Clastic Sedimentary Rock (primarily Quartz with Iron Oxide cement)
sedimentary
Citrine (Heat-treated Amethyst)
Quartz (Silicon Dioxide, SiO2)
mineral
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
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
Green Aventurine
Silicon Dioxide with Fuchsite (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
metamorphic
Lemon (Mock specimen mimicking Citrine/Sulfur)
Citrus x limon
Organic (Biological specimen)
Citrine (Heat-Treated)
Silicon Dioxide (SiO2)
mineral
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
Metamorphic Rock (variety of Quartz)