Banded Slate or Siltstone with Quartz/Calcite Veins
Protolith-derived Siltstone or Slate (varies based on degree of metamorphism)
metamorphic
Category
Sedimentary Or Metamorphic Derived
Browse sedimentary or metamorphic derived specimens identified by the Rock Identifier community.
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Marble
Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)
metamorphic
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Marble
Recrystallized Calcite (CaCO3) / Marble
metamorphic
Mica Schist
Mica Schist (primarily Muscovite and/or Biotite composition)
metamorphic
Mica Schist
Mica Schist
metamorphic
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Limonite after Pyrite (Prophecy Stone or Ironstone Concretion)
Goethite/Limonite pseudomorph after Pyrite/Marcasite (FeO(OH)·nH2O)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Blue Apatite
Apatite-(CaF), Ca5(PO4)3F
mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
mineral
Pyrite (Cube variety)
Iron Sulfide (FeS2)
mineral
Mica Schist
Mica Schist (predominantly Muscovite or Biotite sheet silicates)
metamorphic
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Copper-bearing Mica Schist
Mica Schist with Native Copper inclusions
metamorphic
Schist (Micaceous Schist)
Schist (containing mainly Muscovite and Quartz)
metamorphic
Amethyst and Hematite Bracelet
Amethyst (SiO2) and Hematite (Fe2O3)
mineral
Green Opal
Hydrated Silica (SiO2·nH2O)
mineraloid
Gneiss (specifically Granite Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Clear Quartz
Silicon Dioxide (SiO2) / Rock Crystal
mineral
Hematite (Tumbled)
Iron(III) oxide (Fe2O3)
mineral
Pyrite in Matrix (likely Quartz or Coal)
Iron Sulfide (FeS2)
mineral
Granite Gneiss
Gneiss (derived from granitic protolith)
metamorphic
Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Greenstone / River Siltstone
Metasedimentary Greenstone (Chlorite-rich Siltstone)
metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite
metamorphic
Jasper Conglomerate (Puddingstone)
Siliceous Conglomerate (Quartz and Jasper clasts in a fine-grained matrix)
sedimentary
Rhodonite
Manganese silicate: (Mn,Fe,Mg,Ca)SiO3
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Banded River Cobble with Mafic Dike
Hydrothermally altered Graywacke or Sandstone with Mafic Intrusion
igneous and sedimentary
Limonite (Iron Ore)
Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)
mineral
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Fuchsite Gneiss or Schist
Muscovite (variety Fuchsite) within Metamorphic Host Rock
metamorphic
Mica Schist
Mica Schist (primarily Muscovite and Quartz)
metamorphic
Schist (Micaceous)
Mica Schist (predominantly Muscovite or Biotite)
metamorphic
Hematite
Iron(III) oxide (Fe2O3)
mineral
Green Aventurine
Silicon Dioxide with Fuchsite (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
metamorphic
Goethite pseudomorph after Pyrite
Goethite (FeO(OH)) pseudomorph after Pyrite (FeS2)
mineral
Unidentified Rock Fragment
Unknown
Rock
Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic