Quartzite
Quartzite (primarily SiO2)
metamorphic
Category
Man Made Byproduct (Often Mistaken For Obsidian Or Emerald)
Browse man made byproduct (often mistaken for obsidian or emerald) specimens identified by the Rock Identifier community.
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Leland Blue Stone
Anthropogenic Iron Smelting Slag
mineraloid
Quartzite
Quartzite (primarily SiO2)
metamorphic
Silver (Sterling Silver Jewelry)
Argentum (Ag) mixed with Copper (Cu)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Swirled Agate Bead
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
Mineral
Diamond (Cluster Ring)
Carbon (C)
mineral
Green Quartz (Prasiolite or Aventurine)
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Metal Chain Belt with Square Plates
Not applicable (man-made)
Man-made Object (Metalwork)
Quartzite
Quartzite (SiO2)
metamorphic
Opalite
Man-made opalized glass
mineral
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Sea Glass
Man-made silicate glass
sedimentary
Ambergris
Ambra grisea (Metabolic byproduct)
Organic (Geological relative)
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Flower Agate
Chalcedony with Opaque Spherulitic Inclusions (SiO2)
Mineral
Sandstone
Arenite (composed primarily of Quartz: SiO2)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Diamond
Carbon (C)
mineral
Chert (Chocolate or Brown Flint)
Chert (SiO2)
sedimentary
Diamond (Emerald Cut)
Carbon (C)
mineral
Slag Glass
Amorphous Silica Glass (with metal oxide inclusions)
Mineraloid / Industrial Waste
Flint
Silicon Dioxide (SiO2) - Chert variety
sedimentary
Emerald
Beryl (variety Emerald), Be3Al2Si6O18 with Cr and/or V
Mineral
Emerald
Beryl (Be₃Al₂Si₆O₁₈), specifically the green variety colored by trace amounts of chromium or vanadium.
Mineral
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Natural Gemstone Cabochons (Ruby, Moonstone, Emerald, Citrine)
Ruby (Al2O3:Cr), Moonstone (KAlSi3O8), Emerald (Be3Al2(SiO3)6:Cr), Citrine (SiO2)
mineral
Not a rock, mineral, or geological specimen
N/A
Pearl (Biogenic Mineraloid)
Calcium carbonate (CaCO3) primarily as Aragonite
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Sea Glass
Man-made vitreous material
mineral
Quartz (likely a macrocrystalline variety like milky quartz or smoky quartz, given the appearance in the image)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Black Obsidian
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Quartz
Quartz (SiO₂)
Mineral
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Sulfur (with Matrix)
Native Sulfur (S8)
mineral
Azurite–malachite-bearing copper ore
Azurite (Cu₃(CO₃)₂(OH)₂) with malachite (Cu₂CO₃(OH)₂), in a copper-rich host rock
mineral
Obsidian Arrowhead
Obsidian (Volcanic Glass)
igneous