Vanadinite
Vanadinite (Pb5(VO4)3Cl)
mineral
Category
Sedimentary (Secondary Mineral Formation)
Browse sedimentary (secondary mineral formation) specimens identified by the Rock Identifier community.
Learn about Sedimentary (Secondary Mineral Formation) in the encyclopedia
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Celestite (Celestine)
Celestine (Strontium Sulfate, SrSO4)
Mineral
Yellow Quartz (Citrine Quartz variety / Ferruginous Quartz)
Silicon Dioxide (SiO2) with iron inclusions
mineral
Iron-rich rock or Concretion
Ironstone or Limonite concretion
sedimentary
Small weathered fossil or mineral fragment
Indeterminate; possibly fossilized shell, bone, or a pale carbonate mineral
fossil
Quartz (Chert/Chalcedony variety)
Silicon Dioxide (SiO2)
mineral
Unopened Geode
Geode (containing various mineralization like Quartz SiO2)
sedimentary
Geode Nodules / Keokuk Geode
Quartz / Chalcedony Geode (SiO2)
sedimentary
Limonitic Iron Ore / Goethite
Hydrated Iron(III) oxide-hydroxide (primarily FeO(OH)·nH2O)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Jasper (Chert)
Silicon Dioxide (SiO2)
sedimentary
Red Jasper (Chert)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Sandstone (with Limonite staining)
Arenite (primarily SiO2 with FeO(OH)·nH2O)
sedimentary
Quartz Geode with Iron Oxide
Silicon Dioxide (SiO2) with Hematite/Goethite coatings
mineral
Jasper (Banded Jasper / Chert)
Silicon Dioxide (SiO2 with iron oxide inclusions)
sedimentary
Agate (Carnelian type)
Silicon Dioxide (SiO2)
mineral
Limitation Concretion
Ironstone Concretion (Goethite/Limonite)
sedimentary
Banded Iron Formation (BIF)
Banded Iron Formation
Sedimentary Rock
Grey Banded Agate
Silicon Dioxide (SiO2)
sedimentary
Limonite/Ironstone
Limonite (Hydrous ferric oxides), FeO(OH)·nH2O
sedimentary
Chalcedony (Grey/White Agate)
Silicon Dioxide (SiO₂)
mineral
Quartz on Schist
Silicon Dioxide (SiO2) on Foliated Metamorphic Rock
metamorphic
Hematite Beads
Iron Oxide (Fe2O3)
mineral
Green Jasper
Silicon Dioxide (SiO2) with iron silicate inclusions
sedimentary
Limonite / Goethite Ironstone
FeO(OH)·nH2O (Hydrous iron oxide)
mineral
Limonite
FeO(OH)·nH2O (Hydrated iron oxide)
mineral
Brecciated Jasper
Brecciated Jasper (Microcrystalline Quartz / SiO2)
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Red Jasper
Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Basalt with Quartz Veining
Basalt (Mafic Extrusive Igneous Rock) with SiO2 (Silicon Dioxide) veins
igneous
Pyrite
Iron Pyrite (FeS2)
mineral
Lapis Lazuli
Lazurite-dominant rock, (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Druzy Chalcedony (Agate Geode)
Silica (SiO2) - Cryptocrystalline Quartz with druzy macrocrystalline quartz
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
mineral
Agate (or Chalcedony)
Silicon Dioxide (SiO2)
mineral
Agate (Geode nodule fragment)
Chalcedony (cryptocrystalline variety of Quartz), SiO2
mineral
Black Limestone with Calcite Veins
Carboniferous Limestone with Secondary Calcite Infill
sedimentary
Quartz (Smoky Quartz / Calcite)
SiO2 (Silicon Dioxide)
mineral
Weathered sandstone or volcanic rock fragment
Indeterminate; likely quartz–feldspar-rich sandstone, possibly altered volcanic rock
sedimentary
Jasper
Silicon Dioxide (SiO2) with impurities, microcrystalline quartz
sedimentary