Aventurine (Green Aventurine)
Quartz with Fuchsite Inclusions (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.
Basalt
Extrusive mafic igneous rock
igneous
Basalt (River Pebble)
Extrusive mafic igneous rock
igneous
Concretion (Sandstone)
Carbonate-cemented Sandstone Concretion
sedimentary
Quartz Geode (Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Sandstone (Flagstone)
Arenite (composed primarily of SiO2)
sedimentary
Basalt Pebble with Quartz Veining
Basalt (extrusive volcanic rock)
igneous
Sandstone (specifically Arkose or Ferruginous Sandstone)
Sandstone (SiO2 with iron oxide inclusions)
sedimentary
Quartz (Milky/Yellowish variety)
Silicon Dioxide (SiO2)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Red Sandstone
Arenite (primarily Quartz with Iron Oxide)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Pebble (with Manganese dendrites/staining)
Silicon Dioxide (SiO2) with Manganese Oxide impurities
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Basalt
Basalt (Mafic volcanic rock)
igneous
Jade (likely Nephrite or Jadeite)
Nephrite (a variety of actinolite, Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (NaAlSi2O6)
Metamorphic rock (for Nephrite and some Jadeite); Mineral (for Jadeite)
Chrysoprase
Chrysoprase (a variety of Chalcedony, SiO₂)
Mineral
Tufa
Calcareous Tufa (CaCO3)
sedimentary
Dendritic Agate (River Pebble)
Silicon Dioxide (SiO2) with Manganese or Iron oxide inclusions
mineral
Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Ironstone Concretion (Moqui Marble)
Iron Oxide Concretion (Fe2O3 / FeO(OH) mixed with SiO2)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Serpentine
Serpentine group ((Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz / Iron-Stained Quartz
Silicon Dioxide (SiO2) with iron oxide inclusions/staining
mineral
Wonderstone (Banded Rhyolite)
Rhyolite (Silicon Dioxide with Iron Oxide impurities)
igneous
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Greisen
Greisen
Metamorphic
Lapis Lazuli
Lapis Lazuli (Primary mineral: Lazurite (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2)
metamorphic
Graphic Granite (Zebra Rock)
Pegmatitic Granite (composed of Quartz and K-Feldspar)
igneous
Chert / Flint
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Basalt
Extrusive mafic igneous rock
igneous
Crushed Granite Gravel
Granite (composed primarily of Quartz, Alkali Feldspar, and Plagioclase Feldspar)
igneous
Scoria with Calcite Infills
Vesicular Basalt with secondary Calcification (CaCO3)
igneous
Quartzite
Quartzite (Primary mineral: Quartz, SiO2)
metamorphic
Sandstone
Clastic sedimentary rock (Quartz arenite/Arkose)
sedimentary
Eclogite
Eclogite (Pyrope garnet and Omphacite pyroxene)
metamorphic
Sandstone
Clastic Sedimentary Rock (composed of SiO2 grains)
sedimentary