Agate
Banded Chalcedony (SiO2)
Category
Browse mixed: igneous and sedimentary specimens identified by the Rock Identifier community.
Agate
Banded Chalcedony (SiO2)
Hematite Ball
Iron(III) oxide (Fe2O3)
Pyrite
Iron Pyrite (FeS₂)
Dalmatian Stone
Dalmatian Stone (formerly called Dalmatian Jasper)
Dalmatian Stone
Dalmatian Jasper (Aplitic Rock)
Dalmatian Jasper
Peralkaline Quartz-Feldspar Rock with Arfvedsonite
Quartz (Rock Crystal)
Quartz (SiO₂ - Silicon Dioxide)
Quartz on Host Rock
Silicon Dioxide (SiO2)
Sandstone or Mudstone with Iron Staining
Ferruginous Sandstone/Mudstone
River Stone (Basalt or Siltstone with banding)
Polished Basaltic or Siliciclastic River Cobble
Dalmatian Stone
Peralkaline Feldsphathic Igneous Rock
Dark Igneous Rock (Likely Basalt or Diabase)
Basalt (extrusive igneous rock) or Diabase (intrusive igneous rock - also known as Dolerite), largely composed of plagioclase feldspar, pyroxene (augite), and sometimes olivine and amphibole. Exact mineralogy would require thin section analysis.
Dalmatian Jasper (Dyed Blue)
Peralkaline Rock with Arfvedsonite and Blue Dye
Dalmatian Stone
Dalmatian Jasper (Aphanitic Igneous Rock with Arfvedsonite inclusions)
Quartz Crystal
Silicon Dioxide (SiO2)
White Agate / Chalcedony
Silicon Dioxide (SiO2)
Quartz Pebble
Quartz (SiO2)
Quartz
Silicon Dioxide (SiO2)
Quartz River Rock
Silicon Dioxide (SiO2)
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Magnetite / Hematite (Iron Ore)
Magnetite (Fe3O4) or Hematite (Fe2O3)
Quartz
Silicon Dioxide (SiO2)
Quartz Pebble
Silicon Dioxide (SiO2)
White Quartz
Silicon Dioxide (SiO2)
Graphite
Graphite (Carbon, C)
Quartz Mineral
Silicon Dioxide (SiO2)
Feldspar
Triclinic or Monoclinic Tectosilicate (e.g., KAlSi3O8)
Agate
Silicon Dioxide (Chalcedony), SiO2
Quartz
Silicon Dioxide (SiO2)
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
Milky Quartz
Silicon Dioxide (SiO2)
Clear Quartz Point
Silicon Dioxide (SiO2)
Banded Agate
Chalcedony (Silicon Dioxide, SiO2)
Gneiss
Gneiss
Chalcedony (Tumbled Agate/Jasper)
Silicon dioxide (SiO2)
Quartz (Small Fragment)
Silicon Dioxide (SiO2)
Smoky Quartz
Silicon dioxide (SiO2)
Orange Calcite
Calcium Carbonate (CaCO3)
Pyrite
Iron Sulfide (FeS2)
Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)