Sandstone (Red)
Arenite (primarily Quartz, SiO2, with Iron Oxide cement)
sedimentary
Category
Sedimentary Or Igneous (Secondary Formation)
Browse sedimentary or igneous (secondary formation) specimens identified by the Rock Identifier community.
Learn about Sedimentary Or Igneous (Secondary Formation) in the encyclopedia
View all →
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Boulder
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Flint / Jasper)
Silicon Dioxide (SiO2)
sedimentary
Red Jasper (possibly Petrified Wood)
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary (secondary formation)
Turquoise
Turquoise (CuAl6(PO4)4(OH)8·4H2O)
mineral
Gneiss
Gneiss
metamorphic
Fluorite
Calcium Fluoride (CaF2)
mineral
Chrysocolla (with Malachite / Copper Ore Matrix)
Chrysocolla (Cu,Al)2H2Si2O5(OH)4·nH2O / Malachite Cu2CO3(OH)2
mineral
Quartzite with Druzy Quartz
Silicon Dioxide (SiO2)
metamorphic
Chrysocolla on Limonite Matrix
Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla) on FeO(OH)·nH2O (Limonite)
mineral
Specular Hematite
Hematite (Fe2O3)
mineral
Sandstone (Ferruginous)
Clastic sedimentary rock (SiO2 with Fe2O3)
sedimentary
Calcite
Calcium Carbonate (CaCO3)
mineral
Optical Calcite (Iceland Spar)
Calcium Carbonate (CaCO3)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Magnetite
Iron(II,III) oxide (Fe3O4)
mineral
Quartz (Druzy/Macro-crystalline)
Silicon Dioxide (SiO2)
mineral
Hematite with Magnetite
Iron Oxide (Fe2O3)
mineral
Quartz (Agate/Chalcedony variety)
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartz / Common Agate
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pink Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Pyrite
Pyrite (Iron Disulfide), FeS2
Mineral
Gneiss
Gneiss
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Granite
Granite (a plutonic igneous rock composed of quartz, feldspar, and mica)
igneous
Mixed Rock Collection
Polylithic Geological Specimen Mix
sedimentary and igneous
K2 Jasper (Beads)
Granodiorite with Azurite and Malachite
igneous
Quartz Geode
Silicon Dioxide (SiO2) within Sedimentary or Igneous host
mineral
Quartz (Peach/Orange)
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss
metamorphic
Orange Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Raw Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon dioxide (SiO2)
sedimentary
Gneiss
Gneiss (Metamorphic rock)
metamorphic
Blue-green copper mineral specimen, likely chrysocolla or turquoise
Probable chrysocolla, hydrated copper phyllosilicate (Cu₂H₂Si₂O₅(OH)₄·nH₂O); turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O, is an alternative
mineral
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide) - SiO2
mineral