Amazonite
Microcline (KAlSi3O8) with lead impurities
mineral
Category
Mineralological Specimen
Browse mineralological specimen specimens identified by the Rock Identifier community.
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Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Orbicular Jasper (Ocean Jasper variant)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Chert Nodules in Limestone / Fault Breccia
Silicon Dioxide (SiO2) in Calcium Carbonate (CaCO3) matrix
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Chert (specifically Yellow Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Quartz (Milky or Iron-stained)
Silicon Dioxide (SiO2)
mineral
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2) with Hematite/Limonite
mineral
Chert (Common Opal/Agatized Rock)
Microcrystalline Quartz (SiO2) with potential Chalcedony/Opaline silica
sedimentary
Clear Quartz with Limonite
Silicon Dioxide (SiO2) with Hydrated Iron Oxides
mineral
Banded Chert in Matrix
Microcrystalline Quartz (SiO2)
sedimentary
Amethyst Geode
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Polished jasper pebble
Jasper, microcrystalline quartz (SiO₂) with iron-oxide impurities
metamorphic
Iron-rich brown stone, possibly weathered chert or ironstone
Undetermined; likely iron-oxide-bearing silica-rich rock (chert/ironstone)
sedimentary
Fossiliferous Limestone
Biogenic Sedimentary Rock (Calcium Carbonate, CaCO3)
sedimentary
Chert / Flint Handaxe
Cryptocrystalline Quartz (SiO2)
sedimentary
Hematite / Ironstone
Iron Oxide (Fe2O3)
sedimentary
Granite Pebble
Granite (Phaneritic Igneous Rock)
igneous
Banded Chert
Chert (Silicon Dioxide, SiO2)
sedimentary
Granite Water-Worn Pebble
Phaneritic Felsic Igneous Rock (Granite)
igneous
Fossilized Coral (Petoskey Stone type)
Hexagonaria percarinata (Order: Rugosa)
sedimentary
Pink Granite
Granite (High K-Feldspar variety)
igneous
Jasper (Iron-stained Quartzite/Chert)
Silicon Dioxide (SiO2) with iron oxide inclusions
Sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Granite (Pink/Red Granite)
Phaneritic Igneous Rock (primarily SiO2, KAlSi3O8, NaAlSi3O8)
igneous
Chert (Arrowhead Preform or Point)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Reddish Brown Claystone or Siltstone
Argillite / Siltstone / Claystone
sedimentary
Gneissic Schist
Gneiss-schist (Metamorphic rock)
metamorphic
Sandstone with Quartz Vein
Arenite with Quartz (SiO2) protrusion
sedimentary
Obsidian
Volcanic Glass (Amorphous SiO2)
igneous
Orange Calcite (with White Calcite/Quartz matrix)
Calcium Carbonate (CaCO3)
mineral
Quartz (Drusy/Crystalline variety)
Silicon Dioxide (SiO2)
mineral
Pyrite-rich Ore
Pyrite (FeS2) with secondary minerals
mineral
Brown Chalcedony (Agate/Jasper)
Cryptocrystalline Quartz (SiO2)
mineral
Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Blue Apatite
Calcium Fluorophosphate (Ca5(PO4)3F)
mineral
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Paper (Cellulose)
Cellulose (C6H10O5)n
Organic (Anthropogenic)
Dyed Agate
Chalcedony (SiO2)
Mineral
Citrine (Heat-treated)
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic