Geode with Iron-Stained Quartz/Calcite
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) in Sedimentary Matrix
sedimentary
Category
Sedimentary Rock Or Mineral (Depending On Origin And Purity)
Browse sedimentary rock or mineral (depending on origin and purity) specimens identified by the Rock Identifier community.
Learn about Sedimentary Rock Or Mineral (Depending On Origin And Purity) in the encyclopedia
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Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral side of metamorphic/igneous sources
Quartzite
Quartzite (primarily SiO2)
metamorphic
Seashell Fossil
Invertebrate fossil (phylum Mollusca)
fossil
Folded Schist / Gneiss (Metamorphic Rock)
Regional Metaphoric Folded Outcrop (predominantly Schist/Gneiss)
metamorphic
Diamond (in a gold setting)
Carbon (C)
mineral
Fossilized Bone
Petrified Bone / Biogenic Sedimentary
fossil
Banded Calcite (Green Onyx)
Calcium Carbonate (CaCO3)
sedimentary
Hag Stone
Perforated Flint or Chert
sedimentary
Fossiliferous Shale
Fossiliferous Mudstone / Shale
sedimentary
River Rock
Silica-rich water-worn rock
sedimentary
Granite
Intrusive Igneous Rock
igneous
Porphyritic Basalt
Porphyritic Basalt with Plagioclase Phenocrysts
igneous
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Conglomerate
Conglomerate rock
sedimentary
Turquoise in Matrix
Hydrous phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O
mineral
Sandstone (Ferruginous/Banded)
Clastic Terrigenous Sandstone (SiO2 with Fe2O3 cement)
sedimentary
Schist
Schist (various mineralogical compositions including mica, chlorite, talc, etc.)
Metamorphic
Sandstone
Arenite (SiO2 dominated sandstone)
sedimentary
Quartz-rich pegmatite or quartz vein rock
Mostly quartz (SiO₂), with probable feldspar and iron-oxide staining
igneous
Concretion
Siderite or Ironstone Concretion
sedimentary
Sandstone (specifically Arkose or Ferruginous Sandstone)
Sandstone (SiO2 predominant)
sedimentary
Amethyst
Amethyst (Silicon Dioxide - SiO2 with iron impurities)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chalcedony (Quartz Nodule)
Silicon Dioxide (SiO2)
mineral
Sandstone (likely Quartzose)
Arenite (primarily SiO2)
sedimentary
Bull Quartz (White Quartz)
Silicon Dioxide (SiO2)
mineral
Sandstone (Pebble)
Sandstone (SiO2 dominated with minor feldspar/clay)
sedimentary
Tumbled brown mineral pebble, possibly jasper or weathered quartzite
Indeterminate from the blurred image; likely microcrystalline quartz (SiO₂) if jasper, or quartzite dominated by quartz
mineral
Granite
Intrusive Igneous Rock
igneous
Gold Nugget
Native Gold (Au)
mineral
Gold Nugget
Native Gold (Au)
mineral
Druzy Quartz on Host Rock
Silicon Dioxide (SiO2) with various iron-oxide inclusions
mineral
Quartz Geode (Cracked)
Crystalline Silicon Dioxide (SiO2)
mineral
Turquoise and Red Coral
Turquoise: CuAl6(PO4)4(OH)8·4H2O; Red Coral: Corallium rubrum (organic gemstone)
mineral
Quartz (Milky/Common Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz-rich rock, likely milky quartz or quartzite
Quartz (SiO₂), possibly quartzite if metamorphically recrystallized
mineral
Quartz Pebble (Chalcedony/Agate variety)
Silicon Dioxide (SiO2)
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
White quartz-rich pebble
Likely quartzite or milky-quartz pebble (SiO₂)
mineral
Quartz / Quartz Geode fragment
Silicon Dioxide (SiO2)
mineral