Gneiss Pebble
Gneiss (High-grade metamorphic rock)
metamorphic
Category
Mineral Within Sedimentary Rock
Browse mineral within sedimentary rock specimens identified by the Rock Identifier community.
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Sandstone Concretion
Sedimentary Concretion (Quartz sandstone with iron oxide cement)
sedimentary
Garnet Schist or Garnet-bearing Quartzite
Metamorphic rock containing Almandine Garnet (Fe3Al2(SiO4)3) and Quartz (SiO2)
metamorphic
Jasper (Yellow Jasper)
Silicon Dioxide (SiO2) with iron inclusions
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Ferruginous Quartz
Quartz (Silicon Dioxide, SiO2) with Iron Oxide Inclusions
mineral
Gneiss
Gneiss (foliated metamorphic rock)
metamorphic
Yellow Jasper
Silicon Dioxide (SiO2) with Iron Hydroxide impurities
mineral
Turquoise
Hydrated phosphate of copper and aluminium - CuAl6(PO4)4(OH)8·4H2O
mineral
Ironstone Concretion
Siderite / Hematite-bearing Sedimentary Rock
sedimentary
Turquoise
Turquoise (Hydrated phosphate of copper and aluminium), CuAl6(PO4)4(OH)8·4H2O
mineral
Chert (Jasper/Quartzite variant)
Silicon Dioxide (SiO2)
sedimentary
Sandstone Chert Concretion
Silica-cemented Concretion (primarily SiO2)
sedimentary
Red Sandstone
Arenite (primarily SiO2 with Fe2O3)
sedimentary
Ferruginous Sandstone
Clastic sedimentary rock (SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Chert Concretion
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Quartz Geode Segment
Crystalline Silicon Dioxide (SiO2)
mineral
Quartz Vein in Basalt or Sedimentary Host Rock
Silica-veined lithic fragment (SiO2 in host matrix)
sedimentary
Banded Gneiss
Banded Gneiss (High-grade Metamorphic Rock)
metamorphic
Chert / Flint
Microcrystalline quartz (SiO2)
sedimentary
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Druzy (Geode Fragment)
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Dark mineral nodule with white veining
Possibly a calcite-veined manganese- or iron-rich concretion; exact identification requires testing
mineral
Sandstone (likely Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Quartz Geode (likely within Limestone or Dolomite matrix)
Quartz (SiO₂)
Mineral within a Sedimentary Rock
Quartz Geode
Silicon Dioxide (SiO2) in sedimentary host rock
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Common Opal / Chert
Hydrated silica (SiO2·nH2O) or Microcrystalline Quartz (SiO2)
mineral
Gneiss
Metamorphic rock (Gneiss)
metamorphic
Turquoise
Turquoise - CuAl6(PO4)4(OH)8·4H2O
gemstone
Precious Opal in Matrix
Hydrated Silica (SiO2·nH2O)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Gneiss (with Quartzite and Mica)
Gneiss
metamorphic
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Turquoise
CuAl6(PO4)4(OH)8·4H2O (Hydrated copper and aluminum phosphate)
mineral
Geode (Unopened)
Siliceous Septarian Concretion / Geode (SiO2)
sedimentary
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix
Metamorphic or Igneous (context dependent)
Sandstone
Arenite (SiO2 primarily)
sedimentary
Chert (Jaspery variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint Nodules)
Chert (Silicon Dioxide, SiO2)
sedimentary