Yellow Ocherous Siltstone (Limonitic Shale)
Limonitic Siltstone / Goethite-rich Sedimentary Rock
sedimentary
Category
Sedimentary Or Metamorphic (Low Grade)
Browse sedimentary or metamorphic (low grade) specimens identified by the Rock Identifier community.
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White Jade / White Chalcedony
Nephrite Jade (Ca2(Mg,Fe)5Si8O22(OH)2) or Chalcedony (SiO2)
Mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Bloodstone
Chalcedony quartz variety Heliotrope (SiO2)
gemstone
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Graphite
Graphite (Carbon, C)
mineral
Sandstone with Iron Oxide Staining
Arenite with Limonite/Hematite alteration
sedimentary
River Cobble (Quartzite or Weathered Sandstone)
Arenite / Metasandstone (SiO2)
sedimentary
Emerald in Schist (Raw/Tumbled)
Beryllium Aluminum Silicate (Be3Al2Si6O18) with Chromium/Vanadium impurities in Mica Schist
metamorphic
Galena (with Matrix)
Lead Sulfide (PbS)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Ironstone (Limonitic Sandstone)
Ferruginous Sandstone (rich in Limonite: FeO(OH)·nH2O)
sedimentary
Blue Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Orange Quartz with Epidote
Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate hydroxide (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))
mineral
Biotite Schist
Biotite Schist (K(Mg,Fe)3AlSi3O10(OH,F)2)
metamorphic
Sandstone (Ferruginous)
Arenite with Iron Oxide cement
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Feldspar (Potassium Feldspar / Orthoclase)
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Anthracite Coal
Anthracite coal (High-rank coal)
sedimentary
Potassium Feldspar
Orthoclase (KAlSi3O8)
mineral
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Gneiss
Foliated Metamorphic Rock
metamorphic
Tumbled pale green mineral specimen, likely calcite
Calcite (CaCO₃), tentative identification
mineral
Gneiss
High-grade Metamorphic Gneiss
metamorphic
Lapis Lazuli (in Matrix)
Lazurite-bearing Metamorphic Rock (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2
metamorphic
Limonite (Iron Stone)
Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O
mineral
Limonite or Goethite (Ironstone)
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Greenstone or Epidote-rich Metamorphic Rock
Chlorite/Epidote Schist or Greenstone
metamorphic
Garnet Schist
Mica Schist with Almandine (Fe3Al2(SiO4)3)
metamorphic
Citrine
Silicon Dioxide (Quartz variety), SiO2
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Gneiss with Quartz Vein
Metamorphic Gneiss with Quartz (SiO2) and Feldspar Injection
metamorphic
Likely weathered limestone or calcite-rich stone
Limestone, primarily calcium carbonate (CaCO₃), possibly calcite
sedimentary
Ferruginous Sandstone
Sandstone (enriched with Iron Oxide)
sedimentary