Chalcedony (Agate Nodule)
Silicon Dioxide (SiO2)
mineral
Category
Mineral (Or Mineraloid If Microcrystalline)
Browse mineral (or mineraloid if microcrystalline) specimens identified by the Rock Identifier community.
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Chert / Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Red Jasper and Hematite
Silicon Dioxide (SiO2) and Iron Oxide (Fe2O3)
mineral
Agate (specifically Botswana or Lake Superior style Agate)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Moss Agate
Silicon Dioxide (SiO2) with Chlorite/Oxide inclusions
mineral
Quartz Pebble (Chert / Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Jasper
Jasper (Cryptocrystalline Quartz, SiO2)
sedimentary
Polished red jasper pebble
Jasper, microcrystalline quartz (SiO₂) colored mainly by hematite/goethite
metamorphic
Aventurine (likely Green Aventurine)
Silicon Dioxide (SiO2) with mineral inclusions
Mineral/Mineraloid within a rock matrix
Amber
Succinite (fossilized tree resin)
mineraloid / sedimentary organic material
Shark Tooth Fossil
Otodus obliquus (or similar prehistoric lamniform shark tooth)
fossil
Fossil Shark Tooth
Chondrichthyes (class)
fossil
Quartz with Epidote / Serpentine (Vein Quartz)
SiO2 (Quartz) with Ca2(Al,Fe)3(SiO4)3(OH) (Epidote)
metamorphic
Likely brown jasper or iron-stained chert
Microcrystalline quartz (SiO₂), with iron-oxide inclusions
mineral
Quartz (Chert/Chalcedony variety)
Silicon Dioxide (SiO2)
mineral
Fossilized Echinoid (Sea Urchin) or Brachiopod
Echinoidea / Invertebrate Fossil
fossil
Jasper (likely Brecciated or Multi-colored)
Jasper (SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with Iron Hydroxide inclusions
mineral
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Chalcedony on Ironstone
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3/FeOOH)
sedimentary
Tumbled blue chalcedony (likely blue quartz/chalcedony)
Cryptocrystalline silica, SiO₂; likely chalcedony, possibly dyed or surface-coated
mineral
Quartz (Chert/Chalcedony variant)
Silicon dioxide (SiO2)
mineral
Concretion
Calcareous/Siliceous Concretion
sedimentary
Polished banded jasper pebble
Jasper, a microcrystalline quartz variety (SiO₂), with iron-oxide and clay/mineral impurities
mineral
Chrysocolla in Jasper (Chryso-Jasper)
Cu2-xAlx(H2-xSi2O5)(OH)4·n H2O (Chrysocolla) + SiO2 (Jasper)
mineral
Copper Ore (Malachite and Limonite bearing rock)
Copper-bearing rock with secondary copper minerals
mineral
Green Jasper
Microcrystalline Quartz (SiO2) with mineral inclusions
sedimentary
Quartz Geode (Nodule)
Silicon Dioxide (SiO2)
sedimentary or igneous
Limonite
FeO(OH)·nH2O (Hydrated iron oxide-hydroxide)
mineral
Geode (Unopened)
Siliceous Geode (SiO2)
sedimentary
Carnelian
Chalcedony (SiO2)
mineral
Limonite (Ironstone) pseudomorph
Limonite (Hydrous ferric oxide), FeO(OH)·nH2O
mineral
Banded Jasper
Silicate Mineral (Microcrystalline Quartz / SiO2)
sedimentary
Red jasper pebble
Microcrystalline quartz (chalcedony), SiO₂, colored by iron oxides
metamorphic
Tumbled jasper
Microcrystalline quartz (SiO₂), commonly iron-rich jasper
mineral
Orange Quartz (Ferruginous Quartz)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Jasper
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Fossil Shark Tooth
Chondrichthyes dentition (Fossilized Tooth)
fossil
Banded Chert
Silicon Dioxide (SiO2) with impurities
sedimentary
Quartzite (with mineral vein)
Metamorphosed Quartz-rich Sandstone (SiO2)
metamorphic
Jasper with Hematite (Red Jasper)
Silicon Dioxide with Iron Oxide (SiO2 and Fe2O3)
sedimentary (physico-chemical precipitate)