Polychrome Jasper
Silicon Dioxide (SiO2) with iron and other mineral inclusions
sedimentary
Category
Mineral (Processed Alloy)
Browse mineral (processed alloy) specimens identified by the Rock Identifier community.
Black Onyx
Silicon Dioxide (SiO2) with layered chalcedony
mineral
Blue Agate (Dyed)
Silicon Dioxide (SiO2) with artificial pigment
mineral
Quartz-bearing rock or quartz-rich mineral specimen
Quartz, silicon dioxide (SiO₂); exact host rock is uncertain from the image
mineral
Dyed Agate (Tumbled)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Blue Dyed Agate
Silicon Dioxide (SiO2)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide inclusions (Hematite/Limonite)
mineral
Limonite-pseudomorph after Pyrite (Prophecy Stone)
Goethite and Limonite secondary minerals (FeO(OH)·nH2O) replacing Pyrite (FeS2)
mineral
Druzy Quartz on Agate/Chert
Silicon Dioxide (SiO2)
mineral
Sunstone
Oligoclase (a plagioclase feldspar variant), (Na,Ca)(Al,Si)4O8
mineral
Clear Quartz (or Rock Crystal)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
River Rock (River Cobbles)
Fluvial Conglomerate Clasts (primarily composed of various minerals such as Quartz, SiO2)
sedimentary
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals like Antigorite, Lizardite, and Chrysotile)
metamorphic
Granite
Granite (Felsic Intrusive Igneous Rock)
igneous
Cubic Zirconia (CZ)
Cubic Zirconium Dioxide (ZrO2)
mineral (synthetic)
Serpentinite
Serpentinite
metamorphic
Amber (Copal)
Succinate (Fossilized Tree Resin)
mineraloid
Rose quartz beads
Quartz, silicon dioxide (SiO₂), pink variety
mineral
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide / Chalcedony)
metamorphic
Grey Slate
Foliated Metamorphic Rock (formed by low-grade regional metamorphism of shale or mudstone)
metamorphic
Petrified Wood
Silicified Wood (SiO2 - Quartz/Chalcendony replacing organic matter)
sedimentary
Prehnite
Prehnite, Ca2Al2Si3O10(OH)2
Mineral
Sodalite
Sodalite (Na4Al3Si3O12Cl)
Mineral
Serpentine
Serpentinite (group of minerals including Antigorite, Lizardite, or Chrysotile) (Mg, Fe)3Si2O5(OH)4
metamorphic
Jasper (specifically Red Jasper or Iron-stained Chert)
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary
Rounded greenstone pebble
Likely serpentinite or chlorite-rich metamorphic rock; exact identification requires testing
metamorphic
Blue Dyed Agate
Chalcedony (cryptocrystalline variety of Quartz), SiO2
mineral
Blue Agate (Dyed)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Titanium Aura Quartz
Titanium-coated Silicon Dioxide (SiO2)
mineral (man-enhanced)
Serpentine
Serpentinite (group of minerals based on (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)
metamorphic
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Chevron Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Druzy Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Goethite inclusions
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral
Porphyry
Porphyritic Igneous Rock
igneous
Chert (Flint Nodule)
Microcrystalline and Cryptocrystalline Quartz (SiO2)
sedimentary
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg, Fe)3Si2O5(OH)4)
metamorphic
Serpentine
Serpentinite (composed mainly of Group Minerals Antigorite, Chrysotile, and Lizardite; Mg3Si2O5(OH)4)
metamorphic
Fossil Coral
Rugose Coral or Tabulate Coral (Phylum Cnidaria)
fossil
Tree Agate
Silicon Dioxide (SiO2) with Chlorite inclusions
Mineral variant