Celestite (Celestine)
Strontium sulfate (SrSO4)
mineral
Category
Mineral (Primary Constituent)
Browse mineral (primary constituent) specimens identified by the Rock Identifier community.
Aquamarine
Beryl (Be3Al2Si6O18 with Fe2+ trace elements)
Mineral
Agate
Silicon Dioxide (SiO2) - Cryptocrystalline Chalcedony
Mineral
Fossilized Shark Tooth (Cretaceous to Neogene)
Elasmobranchii dental fossil (likely Squalicorax or similar species)
mineral (biogenic replacement)
Arid Sandy Loam
Arenosols / Regosols
sedimentary
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite
Mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of Titanium, Iron, or Manganese
mineral
Bumblebee Jasper
Fossiliferous Calcite containing Orpiment and Realgar
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Pink Granite (Potassium-rich Granite)
Phaneritic Felsic Igneous Rock (primarily SiO2, Al2O3, K2O)
Igneous
Picture Jasper
Silicon Dioxide (SiO2) - Opaque Impure Chalcedony
sedimentary
Diamond
Diamond (carbon allotrope), C (chemical formula)
Mineral
Scoria (Lava Rock)
Scoria (Vesicular Basaltic Rock)
Igneous
Basalt (Weathered Pebble)
Extrusive mafic igneous rock; minerals primarily Plagioclase feldspar and Pyroxene
igneous
Boxwork Quartz / Septarian Jasper
Boxwork (SiO2 with iron oxide inclusions)
metamorphic
Lapis Lazuli
Lapis Lazuli (Mineral composition: Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite)
metamorphic
Banded Iron Formation (BIF)
Banded Iron Formation (Fe2O3 + SiO2)
sedimentary
Chert (Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Calcite
Calcite (CaCO 3)
Mineral
Arsenopyrite with Quartz
Arsenopyrite (FeAsS)
mineral
Jadeite Jade
Jadeite (NaAlSi2O6)
metamorphic
Amber
Succinite (specifically for Baltic Amber), Formula: C10H16O
Mineraloid
Quartz Geode in Chert/Limestone Matrix
Silicon Dioxide (SiO2) within Sedimentary Host Rock
sedimentary
Amber
Succinite (specifically for Baltic amber); Approximate formula: C10H16O
Organic Gemstone (Mineraloid)
Limonite-stained Granite
Felsic Plutonic Rock with Hydrated Iron Oxides
igneous
Calcite
Calcite (Mineral; CaCO₃)
Mineral
Metal Chain (Likely Steel or a Steel Alloy)
Steel (primarily iron and carbon); specific alloy unknown
Man-made Object (Metal/Alloy)
Chert (often colloquially called Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Basalt
Basalt
igneous
Sandstone (Ferruginous)
Arenite with Iron Oxide cement (SiO2 + Fe2O3)
sedimentary
Pearl (with Peridot)
Calcium carbonate (CaCO3) + Conchiolin; Peridot: Magnesium iron silicate (Mg, Fe)2SiO4
mineral
Rough Diamond
Diamond (pure Carbon, C)
mineral
Tanzanite (Blue Zoisite)
Ca2Al3(SiO4)(Si2O7)O(OH) + (V) - Vanadium-bearing Zoisite
mineral
Galena
Lead Sulfide (PbS)
mineral
Carnelian (Red Chalcedony)
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Diamond
Native Carbon (C)
mineral
Diamond
Cubic carbon (C)
mineral
Ruby
Corundum (Al2O3:Cr)
mineral
Ruby
Corundum (Al2O3) with Chromium traces
mineral
Hematite
Hematite (Fe2O3)
mineral
Black Onyx
Chalcedony (Silicon Dioxide, SiO2)
mineral
Celestine (Celestite)
Strontium sulfate (SrSO4)
mineral