Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
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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Dumortierite Quartz
Dumortierite (Al7BO3(SiO4)3O3 / inclusion in SiO2)
metamorphic
Fluorite
Calcium fluoride (CaF2)
mineral
Synthetic Convention Badge (Plastic/PVC)
Polyvinyl Chloride (PVC) / Polycarbonate
mineraloid (synthetic)
Dendritic Opal (Merlinite)
Hydrated Silica with Manganese/Iron oxide inclusions (SiO2·nH2O)
mineral
Milky Quartz (Stained with Iron)
Silicon Dioxide (SiO2)
mineral
Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Serpentinite
Serpentinite; chiefly serpentine-group minerals (lizardite, antigorite, chrysotile), often with magnetite and relict olivine/pyroxene
metamorphic
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Sulfur
Native Sulfur (S)
mineral
Siltstone or Mudstone
Siltstone (composed primarily of silt-sized particles)
sedimentary
Quartzite (Iron-stained River Rock)
Metamorphic Rock consisting primarily of Quartz (SiO2)
metamorphic
Spinel
Magnesium aluminum oxide (MgAl2O4)
gemstone
Jadeite Jade
NaAlSi2O6 (Sodium Aluminum Silicate)
metamorphic
Emerald
Beryl (Be3Al2(SiO3)6)
gemstone
Quartz Pebble (with Manganese dendrites/staining)
Silicon Dioxide (SiO2) with Manganese Oxide impurities
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Pale green aventurine (likely quartz) sphere
Quartz, SiO₂; possibly pale green aventurine, with color from inclusions or treatment
mineral
Dumortierite Quartz
Dumortierite (Al7BO3(SiO4)3O3) in Quartz (SiO2)
metamorphic
Quartzite (Lithic Artifact)
Quartzite (SiO2)
metamorphic
Basalt
Basalt
igneous
Basalt
Basalt (containing plagioclase, pyroxene, and olivine)
igneous
Obsidian
Volcanic glass (SiO2 - Silicon Dioxide with impurities)
igneous
Iron Nodule
Iron-manganese concretion (Fe-Mn hydroxide)
sedimentary
Chert (varietal: Flint/Jasper)
Silicon Dioxide (SiO2)
sedimentary
Quartzite
Quartzite (Metamorphosed Sandstone)
metamorphic
Sulfur
Native Sulfur (S)
mineral
Emerald
Beryl (Be3Al2(SiO3)6) with chromium/vanadium impurities
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Dendritic Siltstone
Siltstone with Manganese Dendrites (MnO2)
sedimentary
Diamond
Carbon (C)
mineral
Diabase (Dolerite)
Diabase / Dolerite
igneous
Fluorite, Sodalite, and Rose Quartz collection
Calcium Fluoride (CaF2), Sodium Aluminum Silicate with Chlorine (Na8(Al6Si6O24)Cl2), Silicon Dioxide (SiO2)
mineral
Emerald (Rough)
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
gemstone
Ferruginous Sandstone Concretion (Ironstone Phosphorite)
Ferruginous Sandstone (variable Fe-oxide/hydroxide composition)
sedimentary
Red Quartzite
Quartzite (Metamorphic quartz sandstone)
metamorphic
Obsidian Fetish Carving with Turquoise Inlay
Volcanic Glass with Turquoise (CuAl6(PO4)4(OH)8·4H2O)
igneous
Ironstone (Limonite/Goethite Concretion)
Ferruginous Sedimentary Rock (composed of Goethite FeO(OH) and Limonite)
sedimentary
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
mineral
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary