Opal
Hydrated Silica (SiO2·nH2O)
mineral
Category
Not A Rock (Animated Character)
Browse not a rock (animated character) specimens identified by the Rock Identifier community.
Greenschist
Greenschist (Chlorite-actinolite schist)
metamorphic
Amethyst
Silicon Dioxide with iron impurities (SiO2)
mineral
Banded Agate (Botswana Agate)
Silicon Dioxide (SiO2)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Blue Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Soapstone mushroom decorative carving
Steatite (Hydrous magnesium silicate, Mg3Si4O10(OH)2)
metamorphic
Dalmatian Stone (often called Dalmatian Jasper)
Peralkaline Feldsphathic Igneous Rock
igneous
Painted River Pebble (likely Basalt or Greywacke)
Aphanitic Lithic Clast with Anthropogenic Pigment coating
Sedimentary or Igneous
Limestone (specifically Dolomitic Limestone)
Calcium Magnesium Carbonate (CaMg(CO3)2)
sedimentary
Dalmatian Jasper (Dalmatian Stone)
Perthitic feldspar with Arfvedsonite inclusions
igneous
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Quartzite pebble
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Desert Rose
Gypsum (variety Selenite) or Barite, CaSO4·2H2O
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Moonstone
Orthoclase Feldspar ((K,Na)AlSi3O8)
mineral
Green Aventurine
Aventurine Quartz (SiO2 with inclusions)
metamorphic
Granodiorite
Granodiorite (Intermediate to Felsic Intrusive Rock)
igneous
Limonite (often after Hematite or Goethite)
Limonite (FeO(OH)·nH2O)
mineral
Unakite
Unakite (Metasomatized Granite)
metamorphic
Limonite (Iron Ore/Sandstone mixture)
Limonite (FeO(OH)·nH2O) often mixed with Goethite and sedimentary matrix
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Ironstone Pebble
Ferruginous sedimentary rock (Fe2O3 / FeO(OH) mixed with SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Iron Oxide inclusions
sedimentary
Dalmatian Stone
Dalmatian Jasper (Aplitic Rock)
igneous
Bloodstone (Heliotrope)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Jasper/Flint variety)
Microcrystalline quartz (SiO2)
sedimentary
Quartz (Milky or Cloudy variety)
Silicon Dioxide (SiO2)
mineral
Sodalite
Na8(Al6Si6O24)Cl2 (Sodium Aluminum Silicate Chloride)
mineral
Carnelian
Carnelian (Silicon Dioxide: SiO2)
mineral
Carnelian
Carnelian (a variety of Chalcedony, SiO2)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) - Opaque Chalcedony
sedimentary
Amazonite
Potassium aluminum silicate (KAlSi3O8)
mineral
Blue Quartz (Aventurine)
Silicon Dioxide (SiO2) with inclusions of crocidolite or dumortierite
mineral
Amethyst (Rough Quartz)
Silicon Dioxide (SiO2) with iron impurities
mineral