Geode with Iron-Stained Quartz/Calcite
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) in Sedimentary Matrix
Category
Browse mineral and sedimentary specimens identified by the Rock Identifier community.
Geode with Iron-Stained Quartz/Calcite
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) in Sedimentary Matrix
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2)
Sandstone Concretion
Sedimentary Clastic Rock (Silicate-rich)
Gneiss
Gneiss (High-grade metamorphic rock)
Halite
Halite (Sodium Chloride, NaCl)
Moqui Marble (Concretion)
Iron Oxide Concretion
Limonite (Iron Ore)
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
Chert Nodules
Microcrystalline Quartz (SiO2)
Sandstone
Arenite (specifically Quartz Arenite)
Sandstone
Arenite (SiO2 primarily)
Mica Schist
Mica Schist (predominantly Muscovite or Biotite sheet silicates)
Sandstone
Arenite (primarily SiO2)
Fossilized Shark Tooth (Otodus obliquus)
Otodus obliquus (Mineral composition: Bio-apatite/Calcium Phosphate replaced by various minerals)
Dalmation Stone (often called Dalmatian Jasper)
Peralkaline Rock (Microgranite/Aplite), SiO2 with inclusions of Arfvedsonite
Sandstone
Arenite
Limonite (Ironstone)
Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)
Green Fluorite
Calcium Fluoride (CaF2)
Sandstone (Banded)
Clastic sedimentary rock (primarily SiO2)
Bauxite
Al2O3·2H2O (principally composed of gibbsite, boehmite, and diaspore)
Sandstone with Foliose Lichen
Arenite (Rock matrix) with Xanthoparmelia or Flavoparmelia (Lichen genus)
Sandstone
Arenite (SiO2 based)
Sandstone
Arenite (Siliclastic sedimentary rock)
Sandstone
Arenite (SiO2 principal)
Sandstone
Arenite (primarily SiO2)
Quartz
Silicon Dioxide (SiO2)
Geode (Unopened)
Silicon Dioxide (SiO2) in sedimentary host rock
Hematite (Concretion)
Iron(III) oxide (Fe2O3)
Limestone
Calcium Carbonate (CaCO3)
Sandstone (Weathered Cobble)
Clastic Sedimentary Rock (primarily SiO2)
Sandstone
Arenite (primarily SiO2)
Limonite (Iron Stone/Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
Geode (Unopened)
Chalcedony/Quartz Geode (SiO2)
Fossilized Shark Tooth
Carcharocles or Otodus sp. (Micro-fossilized)
Quartz (Drusy/Crystalline)
Silicon Dioxide (SiO2)
White Quartz Star
Silicon Dioxide (SiO2)
Sandstone
Sandstone (Silicon Dioxide, SiO2)
Blue Apatite
Apatite-(CaF), Ca5(PO4)3F
Limonitic Sandstone with Inclusion
Limonitic Quartz Sandstone (primarily SiO2 with FeO(OH)·nH2O)
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
Chalcedony (Yellow Agate)
Cryptocrystalline Quartz (SiO2)
Sandstone
Arenite (composed primarily of SiO2)