Druzy Quartz on Chert/Siltstone
Silicon Dioxide (SiO2) on Microcrystalline Silica/Siltstone matrix
sedimentary
Category
Sedimentary (Jasper), Mineral (Aquamarine)
Browse sedimentary (jasper), mineral (aquamarine) specimens identified by the Rock Identifier community.
Sandstone (likely Quartzose Sandstone)
Arenite
sedimentary
Opal
Hydrated amorphous form of silica (SiO2·nH2O)
mineral
Carnelian
Carnelian (SiO2 with Iron Oxide impurities)
mineral
Hematite / Goethite (Iron Ore)
Iron Oxide (Fe2O3 / FeO(OH))
mineral
Travertine
Terrestrial Sedimentary Rock (CaCO3)
sedimentary
Quartz (Common or Milky)
Silicon Dioxide (SiO2)
mineral
Precious Opal in Matrix
Hydrated Silica (SiO2·nH2O)
mineral
Shale
Shale (comprised mostly of clay minerals and quartz)
sedimentary
Banded Gneiss
Gneiss
metamorphic
Quartz Druze (Crystalline Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Druzy Geode Fragment
Silicon Dioxide (SiO2)
mineral
Emerald / Green Beryl
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pink Dyed Agate
Silicon Dioxide (SiO2) with synthetic pigment
mineral
Satin Spar
Fibrous Gypsum (CaSO4·2H2O)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Biotite Mica
K(Mg, Fe)3AlSi3O10(F, OH)2
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Magnetite (likely with weathered Limonite/Hematite)
Magnetite (Fe3O4) with iron oxide weathering
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Vanadinite
Vanadinite (Pb5(VO4)3Cl)
mineral
Pyrite (on Quartz matrix)
Iron Sulfide (FeS2)
mineral
Quartz (Grain/Fragment)
Silicon Dioxide (SiO2)
mineral
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Quartz (specifically Milky or Clear Quartz)
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Titanium-Coated Hematite (Aura Hematite)
Titanium-bonded Hematite (Fe2O3 with a Ti coating)
mineral
Celestite (Celestine)
Celestine (Strontium Sulfate, SrSO4)
Mineral
Yellow Quartz (Citrine Quartz variety / Ferruginous Quartz)
Silicon Dioxide (SiO2) with iron inclusions
mineral
Red Sandstone
Arenite (with Iron Oxide / Hematite staining)
sedimentary
Red Sandstone
Arenite (with Iron Oxide pigmentation)
Sedimentary
Gneiss
Gneiss
metamorphic
Clear Quartz Crystal
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone (specifically Red Sandstone)
Arenite (primarily Quartz, SiO2)
sedimentary
Quartz
Silicon dioxide (SiO2)
Mineral