Sandstone
Arenite (clastic sedimentary rock)
sedimentary
Category
Sedimentary (With Some Aspects Of Mineral Replacement)
Browse sedimentary (with some aspects of mineral replacement) specimens identified by the Rock Identifier community.
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Botryoidal Chalcedony
Silicon Dioxide (SiO2)
mineral
Fossilized Bone (Petrified Bone)
Permineralized Vertebrate Remains
sedimentary
Sea Urchin Fossil
Echinoidea (test/fossil)
fossil
Granitic Gneiss
Gneiss (quartz-feldspar-mica complex)
metamorphic
Hematite / Jasper
Iron(III) oxide (Fe2O3) in Quartz (SiO2)
mineral / sedimentary
Jasper
Silicon Dioxide (SiO2)
sedimentary
Green Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Ironstone Concretion (Iron-rich Mudstone)
Siderite / Geothite concretion (FeCO3 / FeO(OH))
sedimentary
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Sandstone concretion
Arenite sedimentary rock (concretion/nodule)
sedimentary
Banded Gneiss
Metamorphic Gneiss
metamorphic
Fluorite on Host Rock
Calcium Fluoride (CaF2)
mineral
Polished dark pebble, possibly basalt or chert
Uncertain; likely fine-grained basalt (plagioclase–pyroxene) or microcrystalline silica (chert)
igneous
Gneiss
Gneiss
metamorphic
Sandstone (likely Arkosic)
Clastic Sedimentary Rock
sedimentary
Jasper
Silicon Dioxide (SiO2)
mineral
Chert (with Iron Staining)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Milky Quartz
SiO2 (Silicon Dioxide)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Banded Gneiss / Metamorphic River Pebble
Gneiss (Foliated Metamorphic Rock)
metamorphic
Blue chalcedony cabochon (probable)
Chalcedony, a cryptocrystalline variety of quartz; silicon dioxide, SiO₂
gemstone
Fossilized Coral (Favosites)
Favosites goldfussi / Tabulata
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Jasper
Jasper / Silicon Dioxide (SiO₂)
sedimentary
Fluorite
Fluorite (CaF₂)
mineral
Gneiss
Gneiss
metamorphic
Petrified Bone (Fossil Bone)
Per mineralization fossil bone (varies by organism, predominantly replacement by SiO2 - Quartz/Chalcedony)
fossil
Chert (often called Jasper or Flint)
Microcrystalline Silica (SiO2)
sedimentary
Chert Arrowhead
Cryptocrystalline Quartz (SiO2)
sedimentary
Ironstone Concretion / Limonite-stained Siltstone
Ironstone (primarily Limonite FeO(OH)·nH2O and Siltstone)
sedimentary
Yellow Chert or Jasper
Silicon Dioxide (SiO2)
sedimentary
Banded Gneiss
Gneiss (Metamorphic rock predominantly containing quartz, feldspar, and mica)
metamorphic
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Ocean Jasper (Orbicular Jasper)
Spherulitic Chalcedony (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (with Iron Oxide)
sedimentary
Ammonite Fossil in Matrix
Ammonoidea subclass (e.g., Arietites or similar genera)
fossil
Chert (specifically Flint or Jasperoid)
Silicon Dioxide (SiO2)
sedimentary
Ironstone with Pyrite
Ferruginous Sandstone (Fe2O3) with minor Sulfide minerals (FeS2)
sedimentary
Fossiliferous Chert with Brachiopod Impression
Chert (SiO2) containing Brachiopoda fossil remains
sedimentary