Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Category
Sedimentary Rock (Possibly Composed Of Various Minerals)
Browse sedimentary rock (possibly composed of various minerals) specimens identified by the Rock Identifier community.
Learn about Sedimentary Rock (Possibly Composed Of Various Minerals) in the encyclopedia
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Quartz
Silicon Dioxide (SiO2)
mineral
Coquina / Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate - CaCO3)
sedimentary
Weathered quartz-rich rock, possibly milky quartz or quartz-bearing granite
Quartz (SiO₂), potentially with feldspar and iron-oxide staining
mineral
Marble
Metamorphic Limestone (CaCO3)
metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Lapis Lazuli
Complex rock composed mainly of lazurite, calcite, and pyrite
gemstone
Quartz (Pebble)
Quartz (SiO₂)
Mineral
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Dendritic Agate
Silicon Dioxide with Manganese/Iron oxide inclusions (SiO2)
Mineral
Quartz / Quartzite
Silicon Dioxide (SiO2)
metamorphic
Honey Calcite
Calcium Carbonate (CaCO3)
mineral
Mixed River Pebbles and Rock Collection
Polymictic lithic conglomerate, sandstone, and quartz pebbles
sedimentary
Basalt with Iron Oxidation
Aphanitic Mafic Igneous Rock (composed primarily of Plagioclase and Pyroxene)
igneous
Moqui Marble (Ironstone Concretion)
Goethite/Hematite Concretion (Fe2O3 / FeO(OH))
sedimentary
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Banded Gneiss
Gneiss (variable mineral composition)
metamorphic
Tiny amber-colored crystal fragment
Indeterminate; possibly quartz, feldspar, mica, or a sulfide mineral
mineral
Mixed Chalcedony and Jasper Bracelet (possibly 'Ocean Jasper' or similar banded variety for brown beads, and blue/grey Chalcedony for the translucent beads)
Chalcedony (SiO2), Jasper (SiO2 with impurities)
Mineral (specifically a cryptocrystalline variety of Quartz)
Sandstone
Arenite (SiO2 main component)
sedimentary
Quartz
Silicon Dioxide (SiO2)
Mineral
Honey Calcite
Calcium Carbonate (CaCO3)
mineral
Mookaite Jasper
Radiolarite (Silicified radiolarian chert), SiO2
sedimentary
Dalmatian Stone (Dalmatian Jasper)
Dalmatian Stone (A variety of Perthite / Aplite)
Igneous
Chert (Jasper/Flint variant)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Limestone
Sedimentary rock composed mainly of calcite (CaCO3)
sedimentary
Limestone
Sedimentary rock composed mainly of calcite (CaCO3)
sedimentary
Limestone
Sedimentary rock composed of Calcium Carbonate (CaCO3)
sedimentary
Stromatolite
Biogenic Sedimentary Rock (composed predominantly of CaCO3)
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Carnelian
Carnelian (Cryptocrystalline Quartz, SiO2)
mineral
Druzy Quartz on Matrix (likely Limestone or Sandstone)
Silicon Dioxide (SiO2) with various trace impurities
Mineral on Sedimentary Rock
Ironstone Concretion / Limonite Specimen
Goethite and Limonite (Hydrous Iron Oxides)
sedimentary
Jasper (Iron-rich)
Silicon Dioxide (SiO2) with Fe2O3 (Hematite) impurities
sedimentary
Banded Gneiss
Gneiss (typically quartz, feldspar, mica, amphibole composition)
metamorphic
Mica Schist
Medium-grade regional metamorphic rock (composition varies)
metamorphic
Green Calcite
Calcite (CaCO3)
mineral
Carnelian (a variety of Chalcedony)
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Granite
Intrusive Igneous Rock (Felsic)
igneous
Riverstone (Sandstone Pebble)
Arenite (SiO2 with various lithic fragments)
sedimentary
Banded Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Fossilized Coral
Rugose Coral (Order Rugosa) or Tabulate Coral
fossil