Quartz Geode
Silicon Dioxide (SiO2)
mineral
Category
Sedimentary (Secondary Mineral Formation)
Browse sedimentary (secondary mineral formation) specimens identified by the Rock Identifier community.
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Milky Quartz
Silicon Dioxide (SiO2)
mineral
Agate (Carnelian / Chalcedony)
Silicon Dioxide (SiO2)
mineral
Dyed Quartz Geode
Silicon Dioxide (SiO2) with artificial pigment
mineral
Chalcedony Geode
Chalcedony (SiO2) within a geode structure
Mineral Geode/Sedimentary or Volcanic related
Likely white quartz or quartz-rich pebble
Quartz (silicon dioxide, SiO₂), possibly a small polished/tumbled specimen
mineral
Banded Agate
Sedimentary Cryptocrystalline Quartz (SiO2)
mineral
Ironstone with Limonite/Goethite coating
Ferruginous Sedimentary Rock (contains Limonite FeO(OH)·nH2O)
sedimentary
Red Sandstone
Arenite (primarily SiO2 with Fe2O3)
sedimentary
Turquoise
Hydrated phosphate of copper and aluminium - CuAl6(PO4)4(OH)8·4H2O
mineral
Boxwork Siderite or Sepatarian Nodule Weathering
Siderite (FeCO3) with secondary mineralization or Boxwork Geode fragment
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Limestone with Calcite Veins
Calcium Carbonate (CaCO3)
sedimentary
Amygdaloidal Basalt
Extrusive Igneous Rock with Amygdules
igneous
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Concretionary Sandstone
Clastic Sedimentary Rock (Sandstone with secondary mineral cementation)
sedimentary
Limonite (Hydrated Iron Oxide / Bog Iron)
FeO(OH)·nH2O
Mineral (Sedimentary context)
Chert with Calcite Veins
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3) intrusions
sedimentary
Sandstone Pebble
Sedimentary quartz arenite
sedimentary
Green Onyx (Banded Calcite)
Travertine (CaCO3 - Calcium Carbonate)
sedimentary
Limonite (Ironstone Concretion)
Limonite (FeO(OH)·nH2O)
sedimentary
Chert / Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Chert with Quartz Veining
Microcrystalline Silica (SiO2)
sedimentary
Quartz (Iron-stained / Orange Quartz)
Silicon Dioxide (SiO2)
mineral
Botryoidal Chalcedony with Iron Staining
Microcrystalline Quartz (SiO2)
mineral
Yellow jasper (likely iron-stained chert or quartzite)
Microcrystalline quartz, SiO₂, colored by iron oxides/hydroxides
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Specular Hematite (Specularite)
Iron Oxide (Fe2O3)
mineral
Calcite with Quartz coating
Calcium Carbonate (CaCO3) with Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Geode (with Agate banding)
Silicon Dioxide (SiO2)
Sedimentary or Igneous (secondary formation)
Turquoise
Turquoise - CuAl6(PO4)4(OH)8·4H2O
gemstone
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Turquoise
Turquoise - CuAl6(PO4)4(OH)8·4H2O
mineral
Sandstone Concretion with Fossil Wood
Ferruginous Sandstone Concretion (SiO2 with Fe2O3 cement)
sedimentary
Shale (possibly Carbonaceous or Oil Shale)
Argillaceous Sedimentary Rock
sedimentary
Agate (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Carnelian
Carnelian (Cryptocrystalline Quartz, SiO2)
mineral
Pink Dyed Agate
Silicon Dioxide (SiO2) with synthetic pigment
mineral
Satin Spar
Fibrous Gypsum (CaSO4·2H2O)
mineral