Fancy Jasper (Ocean Jasper or River Jasper variant)
Silicon Dioxide with inclusions (SiO2)
sedimentary
Category
Synthetic (Not A Natural Rock)
Browse synthetic (not a natural rock) specimens identified by the Rock Identifier community.
Biological Specimen (Domestic Dog)
Canis lupus familiaris
Organic (Non-rock)
Anthracite Coal
Anthracite (Carbon-rich metamorphic rock)
metamorphic
Vesicular Basalt (commonly mistaken for Slag)
Scoriaceous Basalt (composed primarily of Plagioclase Feldspar and Pyroxene)
igneous
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide) - SiO2
mineral
Scoria (Lava Rock)
Scoria (Extrusive Igneous Rock / Mafic Silicates)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Pink Granite (Alkali Feldspar Granite)
Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8)
igneous
Ironstone Concretion (Moqui Marble)
Iron-oxide Concretion (Hydrated ferric oxide, Fe2O3·nH2O)
sedimentary
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Amethyst Geode
Silicon Dioxide (SiO2) with iron impurities
mineral
Mica Schist
Mica Schist (primarily Muscovite and Biotite composition)
metamorphic
Amethyst (Quartz)
Amethyst (Silicon Dioxide with Iron impurities, SiO2)
mineral
Granitic Pegmatite (River Rock specimen)
Granite / Pegmatite (composed of SiO2, KAlSi3O8, and NaAlSi3O8)
igneous
Fluorite (translucent octahedral crystal)
Calcium fluoride (CaF2)
mineral
Nephrite Jade (River Bed Pebble)
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Sodalite
Sodalite: Na8(Al6Si6O24)Cl2
mineral
Unidentifiable Specimen
Undetermined
Unknown
Nephrite Jade
Ca2(Mg, Fe)5Si8O22(OH)2 (Actinolite/Tremolite series)
metamorphic
Red Jasper with Quartz veins
Jasper (Silicon Dioxide, SiO2) with macrocrystalline Quartz veins
sedimentary
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Blue Celestite (Celestine) Cluster
Strontium sulfate (SrSO4)
mineral
Rainbow Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Banded Agate (specifically Moss or River Agate variety)
Cryptocrystalline Quartz (SiO2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Eclogite garnet in matrix
Eclogite (Garnet-Omphacite rock)
metamorphic
Quartzite (Beach Pebble)
Quartzite (primarily SiO2)
metamorphic
Petrified Wood
Silicified Wood (primarily SiO₂ / Silicon Dioxide)
mineral
Gold Ore in Quartz
Auriferous Quartz (SiO2 with Au inclusions)
mineral
Granite (Dioritic or Hornblende-rich)
Phaneritic Plutonic Felsic to Intermediate Igneous Rock
igneous
Carnelian Agate
Chalcedony (Silicon Dioxide, SiO2) with Iron Oxide impurities
mineral
Carnelian Agate
Silicon Dioxide (SiO2) - Variety of Chalcedony
mineral
White Quartzite
Quartzite (primarily SiO2 - Silicon Dioxide)
metamorphic
Quartzite (River Stone)
Quartzite (composed primarily of Silicon Dioxide, SiO2)
metamorphic
Chert / Flint Conglomerate
Silicified Sedimentary Breccia (primarily SiO2)
sedimentary
Banded Gneiss (River Cobble)
Gneiss (High-grade regional metamorphic rock)
metamorphic
Schist
Crystalline Metamorphic Rock (Schistose)
metamorphic
Fluorite
Calcium Fluoride (CaF2)
mineral
Carnelian
Carnelian (variety of Chalcedony, SiO2)
mineral
Fuchsite (Green Muscovite)
K(Al,Cr)2(AlSi3O10)(OH)2
Mineral