Clear Quartz
Silicon Dioxide (SiO2)
mineral
Category
Mineral Side Rock
Browse mineral side rock specimens identified by the Rock Identifier community.
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Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst
SiO2 (Silicon Dioxide with iron impurities)
mineral
Amethyst
Silicon Dioxide (SiO2) with Fe3+ impurities
mineral
Fossilized Shark Tooth (Otodus obliquus)
Otodus obliquus (Mineralized Apatite / Bio-apatite)
fossil
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Garnet
Almandine-Pyrope group, X3Y2(SiO4)3
mineral
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Citrine (Heat-treated Amethyst)
Silicon Dioxide (SiO2) with iron impurities
mineral
Quartz crystal cluster
Quartz (silicon dioxide, SiO₂)
mineral
One Pound Coin (UK)
Nickel-Brass Alloy (Cu-Zn-Ni)
mineral
Quartz
Silicon Dioxide (SiO₂)
Mineral
Garnet Schist
Garnetiferous Mica Schist
metamorphic
Quartz-rich pegmatite with drusy quartz
Quartz (SiO₂) in a granitic pegmatite, likely with feldspar and mica inclusions
igneous
Iron Ore / Ironstone Concretion
Mixture of iron oxide/hydroxide minerals, likely some combination of Hematite (Fe2O3), Goethite (α-FeOOH), and Limonite (a general term for hydrated iron oxides of variable composition) or potentially Bauxite (a mixture of aluminum hydroxides, often with iron oxides, (Al(OH)3) and FeO(OH)). The visual characteristics strongly suggest iron-rich material.
Mineral, specifically an iron ore
Garnet
Silicate mineral group (often Pyrope or Almandine in this color range)
gemstone
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Black Tourmaline (Schorl)
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Petoskey Stone / Fossilized Coral
Hexagonaria percarinata
fossil
Petoskey Stone (Coral Fossil)
Hexagonaria percarinata (Fossilized colonial rugose coral)
sedimentary
Clear quartz crystal
Quartz (silicon dioxide, SiO₂)
mineral
Garnet
Almandine Garnet (Fe3Al2(SiO4)3)
mineral
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Amethyst
Quartz, SiO₂, purple variety
mineral
Black Tourmaline (Schorl)
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst
Amethyst (variety of Quartz, SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Garnet (Almandine variety)
Almandine Garnet (Fe3Al2(SiO4)3)
mineral
Smoky Quartz Cluster
Quartz (Silicon Dioxide) - SiO2
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Amethyst (Quartz)
Silicon Dioxide (SiO2) with iron impurities
mineral
Green Apophyllite
Fluorapophyllite-(K), KCa4(Si8O20)(F,OH)·8H2O
mineral
Clear Quartz Point
Silicon Dioxide (SiO2)
mineral
Aquamarine
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Amethyst (Geode)
Silicon Dioxide (SiO2) with iron impurities
mineral
Smoky quartz crystal
Quartz (SiO₂), naturally irradiated smoky variety
mineral
Petoskey Stone / Rugose Coral Fossil
Hexagonaria percarinata
fossil
Petoskey Stone
Hexagonaria percarinata (Fossilized Coral)
sedimentary