Shale or Argillite
Shale (sedimentary) / Argillite (metamorphic)
Category
Browse sedimentary or metamorphic specimens identified by the Rock Identifier community.
Shale or Argillite
Shale (sedimentary) / Argillite (metamorphic)
Anthracite Coal
Anthracite (Carbon-rich Sedimentary-to-Metamorphic Rock)
Milky Quartz with Iron Inclusions
Quartz (Silicon Dioxide, SiO2)
Anthracite Coal
Anthracite (Carbon-based sedimentary-derived metamorphic rock)
Jasper Conglomerate (Puddingstone)
Siliceous Conglomerate (Quartz and Jasper clasts in a fine-grained matrix)
River Pebbles and Quartz
Mixed Igneous, Sedimentary, and Metamorphic Rocks (Silicon Dioxide SiO2 dominant)
Calcite
Calcite (CaCO3)
Orange Calcite (likely polished specimen)
Calcite
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
Calcite (commonly referred to as Orange Calcite or Honey Calcite given its color)
Calcite
Yellow Aventurine
Silicon Dioxide with inclusions (SiO2 + Muscovite/Fuchsite)
Quartz Vein in Pelite (Metamorphic Rock)
Hydrothermal Quartz Veining in Metasedimentary Rock (SiO2)
Calcite
Calcite (CaCO₃, Calcium Carbonate)
Green Aventurine
Silicon dioxide (SiO2) with fuchsite inclusions
Quartz
Quartz (SiO₂ - Silicon Dioxide)
Unidentifiable Rock Fragment
Jasper (Red and Yellow)
Silicon Dioxide (SiO2) with iron oxide impurities
Yellow Agate
Agate (Varietal form of Chalcedony/Quartz, SiO2)
Milky Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
Specular Hematite with Quartz and Limonite
Hematite (Fe2O3) with Quartz (SiO2) and Limonite (FeO(OH)·nH2O)
Zoisite with Ruby (Anyolite)
Zoisite – Ca2Al3(SiO4)3(OH) with inclusions of Ruby (Al2O3:Cr)
Green Opal
Hydrated Silica (SiO2·nH2O)
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
Pyrite in Quartzite/Graphite Matrix
Iron Sulfide (FeS2)
Quartz
Silicon Dioxide (SiO2)
Green Aventurine
Aventurine Quartz (SiO2 with inclusions of Fuchsite)
Quartz Vein in Host Rock (Likely Slate or Shale)
Hydrothermal Quartz (SiO2) in Pelitic host rock
Red Jasper
Jasper (Silicon Dioxide, SiO2)
Quartz Vein in Sedimentary Matrix
Silicon Dioxide (SiO2) with host rock
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)
Banded River Cobble with Mafic Dike
Hydrothermally altered Graywacke or Sandstone with Mafic Intrusion
Limonite (Iron Ore)
Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)
Limonite after Pyrite (Prophecy Stone or Ironstone Concretion)
Goethite/Limonite pseudomorph after Pyrite/Marcasite (FeO(OH)·nH2O)
Jasper (Red Jasper)
Silicon Dioxide (SiO₂)
Amethyst and Hematite Bracelet
Amethyst (SiO2) and Hematite (Fe2O3)
Quartz (Raw Chunk)
Silicon Dioxide (SiO2)
Pyrite
Iron Sulfide (FeS2)
Pyrite in Quartz
Iron Sulfide (FeS2) on Silicon Dioxide (SiO2)
Unidentified Rock Fragment
Unknown
Quartz (Milky/Common Quartz)
Silicon Dioxide (SiO2)
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities