Limonite (Iron Ore)
Hydrous ferric oxides (FeO(OH)·nH2O)
sedimentary
Community gallery
All rocks & minerals
Every specimen the Rock Identifier community has discovered, from desert agates to deep-sea basalts.
Basalt River Cobble
Basalt (Mafic Igneous Rock)
igneous
Glauconitic Sandstone
Glauconitic sandstone ((K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Chert (var. Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Green Aventurine
SiO2 (Quartz with Fuchsite inclusions)
mineral
Quartz on Limestone
Silicon Dioxide (SiO2) on Calcium Carbonate (CaCO3)
Mineral on Sedimentary
Bituminous Coal
Organic Sedimentary Rock (Carbon-based)
sedimentary
Basalt River Stone
Aphanitic Basalt
igneous
Chert (Iron-stained)
Chert (SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Fire Agate
Silicon Dioxide (SiO2) with layers of Limonite/Goethite
mineral
Red Jasper
Silicon Dioxide (SiO2)
sedimentary
Quartzite pebble
Quartzite (SiO2 based)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Hag Stone
Porous Quartz or Chert Pebble (SiO2)
sedimentary
Eudialyte
Na15Ca6Fe3Zr3Si26O72(OH,Cl)2 (Eudialyte Group)
mineral
Chert (Smooth River Pebble)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Tiger's Eye
SiO2 (Silicon Dioxide) with fibrous crocidolite inclusions
mineral
Leopard Skin Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Black Onyx
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
Metamorphic Quartzite (SiO2)
metamorphic
Fossilized Oyster Shell (Limestone/Coquina)
Crassostrea (Fossilized Bivalve), Calcium Carbonate (CaCO3)
sedimentary
Chert (v. Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert
Chert (SiO2)
sedimentary
Ruby in Quartz with Tourmaline
Corundum (Al2O3) in Silicon Dioxide (SiO2) with Schorl
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Banded Agate (Silk Agate or Maligano Jasper variant)
Silicon Dioxide (SiO2)
sedimentary
Carnelian
Carnelian (variety of Chalcedony, SiO2)
mineral
Amber
Succinate (Succinite for Baltic varieties)
mineraloid
Amber
Succinates (C10H16O)
mineraloid
Carnelian (Agate)
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Amygdaloidal Basalt
Amygdaloidal Basalt
igneous
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chalcedony (Chert/Flint)
Silicon Dioxide (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz-Veined Mudstone
Argillite or Mudstone with Quartz Veining (SiO2 in Siliciclastic Matrix)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic