Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Category
Sedimentary Rock (Possibly Composed Of Various Minerals)
Browse sedimentary rock (possibly composed of various minerals) specimens identified by the Rock Identifier community.
Pyrite on Limestone
Iron Disulfide (FeS2) in Calcium Carbonate (CaCO3) matrix
sedimentary (matrix) / mineral (inclusion)
Chert (Nodule)
Chert (SiO2)
sedimentary
Limonite (Ironstone)
Limonite (mixture of hydrated iron oxides, primarily Goethite α-FeO(OH))
mineral
Gossan (Iron Hat)
Limonitic Gossan (predominantly FeO(OH)·nH2O)
igneous/metamorphic derivative
Sandstone (Quartz Arenite)
Sandstone (dominated by SiO2 quartz grains)
sedimentary
Granodiorite
Granodiorite
igneous
Porphyritic Andesite
Andesite (Intermediate Extrusive Volcanic Rock)
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Quartzite with Hematite staining
Quartzite (SiO2) with iron oxide inclusions
metamorphic
Dalmatian Stone
Dalmatian Jasper (Aplitic Rock)
igneous
Milky Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Sapphire (Corundum)
Corundum (Al2O3), variety Sapphire
Mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions
sedimentary
Limonite
Limonite (Hydrous iron oxides, predominantly Goethite FeO(OH)·nH2O)
mineral
Concretion (Sandstone)
Sandstone Concretion
sedimentary
Granite
Granite (compositional mixture of Quartz, Feldspar, and Mica)
igneous
Dalmation Stone (Dalmation Jasper)
Peralkaline rock (primarily Feldspar and Quartz with Arfvedsonite spots)
igneous
Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite (predominantly Quartz Sandstone)
sedimentary
Sandstone (Quartzose Sandstone)
Clastic Terrigenous Sedimentary Rock (primarily SiO2)
sedimentary
Moonstone (bead form)
Potassium Aluminum Silicate (KAlSi3O8) - a variety of Orthoclase Feldspar
Mineral
Sandstone (likely Calcareous or Quartz-rich)
Arenite (SiO2 based typically)
sedimentary
Red Jasper (beads)
SiO₂ (Silicon Dioxide)
Mineral, variety of chalcedony (microcrystalline quartz)
Sandstone (likely Quartz Sandstone)
Arenite (SiO2 based)
sedimentary
Granodiorite
Granodiorite (phaneritic intrusive igneous rock)
igneous
Sandstone (Ferruginous)
Sandstone (Clastic sedimentary rock, predominantly SiO2 with Fe2O3 cement)
sedimentary
Jasper
Jasper (Cryptocrystalline Quartz, SiO2)
sedimentary
Iron-stained Quartz
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3/FeO(OH))
mineral
Breccia
Breccia - Clastic sedimentary rock
sedimentary
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock including secondary mineral infills)
Igneous
Marble
Recrystallized Carbonate Rock (CaCO3)
metamorphic
Sandstone
Arenite (SiO2 based typically)
sedimentary
Amazonite (likely mixed with other feldspars/minerals)
Amazonite is a variety of Microcline, which is a tectosilicate mineral, formula KAISi3O8. The mixed beads could include other feldspars or quartz.
Mineral
Amygdaloidal Basalt
Amygdaloidal Basalt (with secondary mineral infilling)
igneous
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Sandstone (Stream-rounded)
Arenite (SiO2 based)
sedimentary
Black Tourmaline
Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)
Mineral
Sandstone (Pebble)
Arenite (primarily SiO2)
sedimentary
Unakite (Epidotized Granite)
Unakite; primarily composed of Epidote (Ca2(Al,Fe)3(SiO4)3(OH)), Orthoclase (KAlSi3O8), and Quartz (SiO2)
Metamorphic
Sandstone
Arenite/Quartz Arenite
sedimentary
Granite
Granite (Felsic Plutonic Rock)
Igneous