Quartz (Milky/Common Quartz)
Silicon Dioxide (SiO2)
mineral
Category
Mineral, Often A Rock Given Its Aggregate Nature
Browse mineral, often a rock given its aggregate nature specimens identified by the Rock Identifier community.
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Yellow Chalcedony (likely carnelian or yellow agate)
Silicon Dioxide (SiO₂)
mineral
Sandstone (Quartzose Sandstone)
Sandstone (SiO2 with various trace minerals)
sedimentary
Green Aventurine
Aventurine (a variety of Quartz, SiO2 with fuchsite inclusions)
Mineral
Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
mineral
Vesicular Basalt
Vesicular Basalt (Aphanitic Mafic Igneous Rock)
igneous
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)
sedimentary
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Limonite after Pyrite (Prophecy Stone)
Limonite (FeO(OH)·nH2O) replacing Pyrite (FeS2)
Mineral pseudomorph
Turquoise in Matrix
Hydrated phosphate of copper and aluminum (CuAl6(PO4)4(OH)8·4H2O)
mineral
Yellow Jasper
Silicon dioxide, SiO2
mineral
Sandstone (Pebble)
Sandstone (arenite, arkose, wacke depending on composition)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Weathered Sandstone with Algae Growth
Arenite
sedimentary
Onyx Marble (also commonly called Onyx)
Calcite (CaCO3), often with other mineral impurities
Sedimentary Rock (specifically a type of Travertine)
Copper Ore
Cupriferous Rock / Mixed Mineral Matrix
igneous
Jasper
Microcrystalline Quartz (SiO2) with impurities
sedimentary
Peacock Ore
Bornite (Cu5FeS4) with surface tarnish
mineral
Gold Nugget
Native Gold (Au)
mineral
Red Jasper
Jasper (Silicon Dioxide, SiO2 with Iron Oxide impurities)
sedimentary
Tumbled Agate and Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Chrysocolla
Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O)
mineral
Yellow Jasper
Silicon dioxide (SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (Microcrystalline Quartz), SiO2
sedimentary
Granite Pebble
Intrusive Igneous Rock
igneous
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Banded Gneiss
Gneiss (pronounced "nice")
metamorphic
Coquina
Biogenic Limestone (Calcite/Aragonite base, CaCO3)
sedimentary
Brown Jasper (Chert)
Silicon Dioxide (SiO2)
sedimentary
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Banded Greywacke
Greywacke (Lithic wacke)
sedimentary
White Topaz
Topaz - Al2SiO4(F,OH)2
mineral
Chrysocolla
Chrysocolla - (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Chert (Green Fossilized Algae or Jasper)
Silicon Dioxide (SiO2)
sedimentary
Sandstone (Quartzose)
Arenite (composed primarily of SiO2)
sedimentary
River Pebble (Brecciated Chert/Siltstone)
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Hemimorphite
Hemimorphite (Zn4Si2O7(OH)2·H2O)
mineral
Limestone Breccia
Sedimentary Breccia (Calcareous)
sedimentary
Chalcedony Geode
Chalcedony (SiO2) within a geode structure
Mineral Geode/Sedimentary or Volcanic related
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Red Jasper
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)
sedimentary