Petoskey Stone
Hexagonaria percarinata (Fossilized Coral)
sedimentary
Category
Mineral Side Rock
Browse mineral side rock specimens identified by the Rock Identifier community.
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Epidote
Epidote (Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Epidote (Unakite variety)
Epidosite (Metasomatic rock containing Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
mineral
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
gemstone
Corundum
Corundum (Al2O3)
Mineral
Clear Quartz
Silicon Dioxide (SiO2)
Mineral
Epidote
Epidote (Ca2(Al2,Fe3+)AlSi3O12(OH))
mineral
Amethyst (Quartz Cluster)
Silicon Dioxide (SiO2) with iron impurities
mineral
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Beryl in Quartz Matrix
Beryllium Aluminum Silicate (Be3Al2Si6O18)
mineral
Amethyst (Polished Point)
Silicon Dioxide (SiO2) with iron impurities
mineral
Tumbled Clear Quartz and Citrine Points
Silicon Dioxide (SiO2)
mineral
Mixed Mineral Collection (Quartz, Amethyst, Rose Quartz, Pyrite, etc.)
Mixed Silicates and Sulfides (SiO2, FeS2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Amethyst or Smoky Quartz Geode Slice
Crystalline Silicon Dioxide (SiO2) with iron impurities
mineral
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
mineral
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
metamorphic
Black Tourmaline
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2 with Iron impurities)
mineral
Red Garnet
Pyrope or Almandine (X3Y2(SiO4)3)
mineral
Quartz (Milky/Crystalline variety)
Silicon Dioxide (SiO2)
mineral
Garnet in Matrix
Almandine Garnet (Fe3Al2(SiO4)3)
metamorphic
Smoky Quartz (Herkimer-style)
Silicon Dioxide (SiO2)
mineral
Fossil Coral (Petoskey Stone / Rugose Coral)
Hexagonaria percarinata (Order: Rugosa, Fossilized Calcium Carbonate CaCO3)
sedimentary
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
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Petoskey Stone (Fossilized Coral)
Hexagonaria percarinata
sedimentary
Clear Quartz Crystal
Quartz (Silicon Dioxide, SiO2)
mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2 with impurities of iron)
mineral
Clear Quartz
Silicon dioxide (SiO2)
mineral
Petoskey Stone (Fossilized Coral)
Hexagonaria percarinata
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst
SiO2 (Silicon Dioxide with iron impurities)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Citrine (Heat-treated Amethyst)
Silicon Dioxide (SiO2) with iron impurities
mineral
Amethyst
Silicon Dioxide (SiO2) with Fe3+ impurities
mineral