Gneiss with Orthoclase Feldspar
Gneissic Metamorphic Rock with K-Feldspar inclusions
metamorphic
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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Sandstone Concretion
Clastic Sedimentary Concretion (typically Quartz/Silica with Iron Oxide)
sedimentary
Sandstone (Stream-rounded Cobble)
Arenite (composed primarily of SiO2, Silica)
sedimentary
Banded Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Fossil-bearing ironstone or weathered concretion
Indeterminate; likely ferruginous sandstone/concretion containing a partial fossil impression
fossil
Fossil Coral
Rugose Coral or Tabulate Coral (Phylum Cnidaria)
fossil
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Conglomerate
Conglomerate (Clastic Sedimentary Rock)
sedimentary
Smoky Quartz
SiO2 (Silicon Dioxide)
Mineral
Magnetite (Lodestone variety)
Magnetite (Iron(II,III) oxide, Fe3O4)
mineral
Flint
Sedimentary cryptocrystalline quartz (SiO2)
sedimentary
Chert (Flinty variety)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (Grooved/Weathered)
Arenite (composed primarily of Quartz and Lithic fragments)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Moqui Marble
Hematite Concretion (Iron Oxide Concretion)
sedimentary
Gneiss
Gneiss
metamorphic
Polished kambaba jasper
Orbicular stromatolitic jasper; microcrystalline quartz (SiO₂) with chlorite/amphibole-rich inclusions
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Green Banded Chert (Agate/Jasper)
Silicon Dioxide (SiO2) with trace impurities of Chlorite or Glauconite
sedimentary
Mixed pebble collection, including likely flint, quartzite, and fossil material
Varied silicate rocks; visible specimen may include chert (microcrystalline SiO₂), quartzite, and a possible fossil
sedimentary
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Gneiss
High-grade regional metamorphic rock (Foliated Gneiss)
metamorphic
Yellow Jasper
Silicon Dioxide (SiO2) with goethite or iron oxide inclusions
sedimentary
Chert with Quartz Druzy
Microcrystalline Quartz (SiO2) with Drusy Quartz Coating
sedimentary
Limestone with Chert Nodule
Carbonate rock (CaCO3) with Microcrystalline Silicon Dioxide (SiO2) inclusion
sedimentary
Gneiss (High-grade Metamorphic Rock)
Gneiss
metamorphic
Common Opal
Amorphous Hydrated Silica (SiO2·nH2O)
mineral
Chert / Flint Arrowhead
Microcrystalline Quartz (SiO2)
sedimentary
Flint with Fossil Inclusion
Cryptocrystalline quartz (SiO2) enclosing fossilized organic remains
sedimentary
Chert / Flint
Microcrystalline quartz (SiO2)
sedimentary
Chert / Flint
Cryptocrystalline quartz (SiO2)
sedimentary
Chert (Flint) River Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone Beach Pebble
Clastic Sandstone (SiO2 - Quartz-dominant)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Red jasper (likely polished/tumbled)
Microcrystalline quartz/chalcedony, SiO₂, colored mainly by iron oxides
mineral
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Gneiss (with Granite/Pegmatite Vein)
Foliated Metamorphic Rock (Quartz-Feldspar Gneiss)
metamorphic
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Pyrite in Matrix (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary