Green Quartz (Prasiolite variant or Aventurine)
Silicon Dioxide (SiO2)
mineral
Category
This Appears To Be A Man Made Metallic Object, Likely Jewelry, Not A Natural Rock, Mineral, Or Geological Specimen.
Browse this appears to be a man made metallic object, likely jewelry, not a natural rock, mineral, or geological specimen. specimens identified by the Rock Identifier community.
Calcite
Calcite (CaCO₃)
Mineral
Rough Diamond
Diamond (pure Carbon, C)
mineral
Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Diamond
Native Carbon (C)
mineral
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide)
mineral
Gneiss (specifically a granitic gneiss cobble)
Gneiss (high-grade regional metamorphic rock)
metamorphic
Obsidian (Arrowhead Lithic Tool)
Obsidian (Amorphous Volcanic Glass / SiO2 + inclusions)
igneous
Beryl (Emerald Variety)
Beryllium Aluminum Silicate (Be3Al2(SiO3)6)
mineral
Quartz Druzy on Matrix (likely Agate or Jasper)
Silicon Dioxide (SiO2) with various mineral inclusions
mineral
Pyrite in Matrix
Iron Disulfide (FeS2)
mineral
Quartz
Silicon Dioxide (SiO₂)
Mineral
Gold Nugget
Native Gold (Au)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Banded Chert or Chert with Quartz Veins
Chert (SiO2)
Sedimentary
Banded Slag Glass (Leland Blue/Frankfort Green style)
Anthropogenic Glass Specimen (Amorphous Silicon Dioxide with impurities)
mineral
Chalcedony Geode
Chalcedony (SiO2) within a geode structure
Mineral Geode/Sedimentary or Volcanic related
Basalt
Basalt (extrusive igneous rock)
Igneous
Banded Agate
Sedimentary Cryptocrystalline Quartz (SiO2)
mineral
Petrified Wood
Silicified wood (Quartz/Chalcedony - SiO2)
sedimentary
Nephrite Jade
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2)
Mineral
Quartz Druzy (Geode Fragment)
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2)
mineral
Dyed Agate Slice
Silicon Dioxide (SiO2) with artificial colorants
Mineral (variety of Chalcedony)
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Quartz (possibly milky quartz)
Quartz (Silica; SiO₂)
Mineral
Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Chert (Chalcedony/Agate variety)
Silicon Dioxide (SiO2)
sedimentary
Ironstone Concretion / Goethite-Hematite Nodule
Goethite/Hematite (α-FeO(OH) / Fe2O3)
sedimentary
Sandstone (likely Arkosic or Quartzose)
Sandstone (SiO2 dominated)
sedimentary
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Blue Howlite (Dyed)
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
mineral
Amethyst
Silicon Dioxide (SiO2) with Iron impurities
mineral
Banded Iron Formation (BIF) with Quartz
Banded Iron Formation, often composed of alternating layers of hematite (Fe2O3) or magnetite (Fe3O4) and chert (microcrystalline quartz, SiO2)
Sedimentary
Jasper with Quartz inclusions
Silicon Dioxide (SiO2) with varying mineral impurities
sedimentary
Iron-Nickel Meteorite (Possible Chondrite or Oxidized Iron)
Siderite (Nickel-Iron) or Chondrite (Si/Fe composite)
igneous
Quartz Geode
Silicon Dioxide (SiO2) in Host Rock
sedimentary
River Stone (likely Basalt or Chert)
Silicon Dioxide (SiO2) for chert or Mafic Extrusive Rock for basalt
igneous/sedimentary
Pyrite
Iron Disulfide (FeS2)
mineral
Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (Flagstone)
Arenite (composed primarily of SiO2)
sedimentary