Chert (Nodule)
Silicon Dioxide (SiO2)
Category
Browse mineral or sedimentary rock (with mineral inclusions) specimens identified by the Rock Identifier community.
Chert (Nodule)
Silicon Dioxide (SiO2)
Red Quartz (Carnelian/Red Jasper Agate)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
Quartz Pebble
Silicon Dioxide (SiO2)
Unidentifiable Rock Fragment
Blue Quartz
Silicon Dioxide (SiO2) with inclusions
Basalt with Secondary Mineral Inclusions
Amygdaloidal Basalt (Mafic volcanic rock, primarily Augite and Plagioclase)
Yellow Chert (Jasper)
Microcrystalline Quartz (SiO2)
Hag Stone
Perforated Sedimentary Rock (Typically Limestone or Sandstone)
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
Dalmation Jasper
Dalmation Stone (perthitic feldspar with arfvedsonite)
Basalt or Slag
Extrusive Igneous Rock / Industrial Slag
Quartz Pebble
Silicon Dioxide (SiO2)
Lapis Lazuli
Lapis lazuli (Complex silicate rock containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite)
Red Jasper (Mookaite style)
Silicon Dioxide (SiO2) with iron oxide impurities
Carnelian Agate
Silicon Dioxide (SiO2) with Iron Oxide impurities
Green Moss Agate
Silicon Dioxide (SiO2) with inclusions of hornblende or chlorite
Vesicular Basalt (or Scoria)
Vesicular Basalt (Aphanitic-vesicular volcanic rock)
Sunstone (variety of Feldspar)
Oligoclase Sunstone, Plagioclase Feldspar (Na,Ca)Al(Si,Al)Si2O8
Ferruginous Sandstone
Arenite with Iron Oxide cement (primarily Fe2O3)
Basalt
Mafic Igneous Rock (composed primarily of Pyroxene and Plagioclase Feldspar)
Flower Agate
Chalcedony (SiO2) with Platy inclusions
Lapis Lazuli
Na8[Al6Si6O24]Sn (Lazurite-rich metamorphic rock)
Green Aventurine
Aventurine Quartz (SiO2 + Cr-bearing Mica inclusions)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Sandstone (Ferruginous)
Arenite (Fe-rich)
Granite Gneiss
Gneiss (Polymetamorphic Quartz-Feldspar-Mica rock)
Red Brecciated Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
Jasper with Agate Inclusions
Silicon Dioxide (SiO2) - variety of Quartz/Chert
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
Gneiss with Orthoclase Feldspar
Gneissic Metamorphic Rock with K-Feldspar inclusions
Pale blue-gray quartz-rich pebble (tentative)
Quartz, SiO₂, possibly chalcedony or a weathered metamorphic fragment
Granite
Granite (Phaneritic Igneous Rock)
Mica Schist with Pyrite
Muscovite/Biotite Schist with Iron Sulfide (FeS2)
Peach Moonstone
Potassium Aluminum Silicate (KAlSi3O8)
Granite with Mafic Xenolith
Intrusive Igneous Rock (Felsic to Intermediate)
Red Sandstone
Arenite (with Iron Oxide cement)
Jasper-Agate Breccia
Silicon Dioxide (SiO2) with iron oxide inclusions
Jasper
Jasper (Cryptocrystalline Quartz; SiO2)
Hag Stone
Perforated Flint or Chert
Sandstone (with Iron Staining)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
Milky Quartz
Silicon Dioxide (SiO2)
Milky quartz
Quartz (silicon dioxide, SiO₂)