Polished orbicular jasper (likely ocean jasper)
Silicified microcrystalline quartz/chalcedony with iron-oxide-rich orbicules; commonly called Ocean Jasper
Category
Browse mineral simulant (synthetic glass) specimens identified by the Rock Identifier community.
Polished orbicular jasper (likely ocean jasper)
Silicified microcrystalline quartz/chalcedony with iron-oxide-rich orbicules; commonly called Ocean Jasper
Sandstone
Clastic Sedimentary Rock
Sandstone
Sedimentary Rock (Quartz arenite / Lithic sandstone)
Sandstone (Quartzite-rich)
Clastic Sedimentary Rock (primarily SiO2)
Sandstone
Arenite (primarily SiO2 with various cementing agents)
Sandstone
Clastic sedimentary rock (primarily SiO2)
Sandstone
Clastic Sedimentary Rock (composed mostly of quartz, SiO2)
Sandstone (Beach Pebble)
Clastic sedimentary rock (primarily Quartz and Feldspar)
Sandstone
Arenite (SiO2 principal)
Tumbled chalcedony (likely carnelian/opaque agate)
Microcrystalline quartz, SiO₂; chalcedony with iron-oxide staining
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Moss Agate
Chalcedony (Silicon Dioxide, SiO2) with inclusions
Silicon
Silicon (Si)
Milky Quartz
Silicon Dioxide (SiO2)
Quartz Pebble
Silicon Dioxide (SiO2)
Milky Quartz
Silicon Dioxide (SiO2)
Sand Fulgurite
Lechatelierite (Silica glass tube)
Quartz on Matrix
Silicon Dioxide (SiO2)
White Topaz
Al2SiO4(F,OH)2
Sandstone
Arenite (SiO2 based)
Sandstone (likely Quartz Sandstone)
Arenite (composed primarily of SiO2)
Milky Quartz
Silicon Dioxide (SiO2)
Milky Quartz
Silicon Dioxide (SiO2)
Quartz with Schorl (Black Tourmaline)
Silicon Dioxide (SiO2) with Sodium Iron Aluminum Borosilicate (NaFe3Al6(BO3)3Si6O18(OH)4)
Milky Quartz with inclusions
Quartz (Silicon Dioxide, SiO2)
Quartz Pebble
Silicon Dioxide (SiO2)
Sandstone
Arenite (clastic sedimentary rock)
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
Sand
Siliciclastic sediment / Quartz sand (SiO2)
Milky Quartz
Silicon Dioxide (SiO2)
Blue Chalcedony
Silicon Dioxide (SiO2)
Silicified fossil-bearing limestone (likely chert/agate replacement)
Microcrystalline quartz (SiO₂) replacing carbonate rock; possible fossiliferous limestone
Quartz (Pink/Orange Variety)
Silicon Dioxide (SiO2)
Banded Chert
Microcrystalline Quartz (SiO2)
Milky Quartz
Silicon dioxide (SiO2)
Amethyst
Silicon dioxide with iron impurities (SiO2 + Fe3+)
Quartz (Clear Quartz)
Silicon Dioxide (SiO2)
Amethyst
Amethyst (Silicon Dioxide, SiO2 + trace Fe3+)
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
White Quartz
Quartz (Silicon Dioxide, SiO2)
Polished Mexican “Crazy Lace” agate tower
Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide inclusions
Ferruginous Quartz (Iron-Stained Quartz)
Silicon Dioxide (SiO2) with Iron Oxide inclusions