Tiger's Eye
Quartz pseudomorph after crocidolite (SiO2)
gemstone
Category
Sedimentary (Chemically Precipitated) Or Metamorphic
Browse sedimentary (chemically precipitated) or metamorphic specimens identified by the Rock Identifier community.
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Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Calcite crystal cluster
Calcite — calcium carbonate, CaCO₃
mineral
Quartz vein in foliated metamorphic rock
Milky quartz (SiO₂) in likely schist or gneiss
metamorphic
Quartz Vein in Amphibolite / Gneiss
Quartz (SiO2) in Mafic Metamorphic Host Rock
metamorphic
Banded iron formation fragment (ironstone)
Banded iron formation; chiefly hematite/magnetite with chert (SiO₂)
sedimentary
Weathered limestone pebble
Limestone; predominantly calcite (CaCO₃)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Optical Calcite (Iceland Spar)
Calcite (Calcium Carbonate, CaCO3)
mineral
Optical Calcite
Calcium Carbonate (CaCO3)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz (Water-worn Pebbles)
Silicon Dioxide (SiO2)
mineral
Pink calcite cluster
Calcite (calcium carbonate, CaCO₃)
mineral
Quartz Vein in Matrix (Breccia / Host Rock with Quartz)
Silicon Dioxide (SiO2) in Host Rock Matrix
metamorphic
Microcrystalline Limestone
Limestone (CaCO3 with impurities)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Hematite
Hematite (Fe2O3)
mineral
Jasper with Hematite
Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3)
sedimentary
Ocean Jasper
Orbicular Jasper (Silicon Dioxide, SiO2)
sedimentary
Weathered iron-rich concretion or laterite fragment
Ferruginous concretion, likely goethite/limonite (hydrated iron oxides) in a clay-rich matrix
sedimentary
Quartzite pebble with Mafic inclusions
Quartzite (SiO2)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Polished blue calcite
Calcite (CaCO₃), likely blue banded or massive calcite
mineral
Schist with sulfide mineralization
Mica schist, likely containing pyrite and/or chalcopyrite; quartz-rich matrix
metamorphic
Quartz (Clear or Milky)
Silicon Dioxide (SiO2)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Chert on Volcanic Host Rock
Sedimentary Chert (SiO2) within Basalt or Andesite
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Chert (or potentially massive Quartz/Quartzite)
SiO2 (Silicon Dioxide)
sedimentary (if chert) / metamorphic (if quartzite)
Honey calcite (orange calcite)
Calcite, calcium carbonate (CaCO₃)
mineral
Iron-stained quartz vein rock
Quartz-rich vein material, predominantly SiO₂, with iron oxyhydroxides (goethite/limonite) and likely sulfide alteration
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite nodule (probable iron sulfide concretion)
Pyrite, FeS₂, likely weathered within a sedimentary concretion
mineral
Orange Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral