Agate (Bead Form)
Agate (Cryptocrystalline Quartz, SiO2)
mineral
Category
Man Made
Browse man made specimens identified by the Rock Identifier community.
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Carnelian (Red Chalcedony)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Chert (Field Stone)
Microcrystalline Quartz (SiO2)
sedimentary
Calcite
Calcium Carbonate (CaCO3)
mineral
Chrysoprase
Chrysoprase (a variety of Chalcedony, SiO₂)
Mineral
Basalt River Pebble
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Pink Feldspar (Orthoclase)
Orthoclase Feldspar (KAlSi3O8)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Jasper
Jasper (Silica/Quartz) - SiO2
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Mixed Tumbled Quartz and Chlorite Quartz
Silicon Dioxide (SiO2) with inclusions
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Greenstone
Greenschist (composed of chlorite, actinolite, and epidote)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Chert (Jasper variation)
Silicon dioxide (SiO2)
sedimentary
Chert (Flint Nodules)
Chert (Silicon Dioxide, SiO2)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Ocean Jasper
Orbicular Jasper (Silicon Dioxide, SiO2)
mineral
Quartz pebble
Silicon dioxide (SiO2)
mineral
Schist
N/A (a rock type, not a mineral formula)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Chert breccia
Sedimentary Breccia (Microcrystalline Quartz)
sedimentary
Quartzite (River Cobble)
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Quartz (White or Milky Quartz Pebble)
Quartz (Silicon Dioxide, SiO2)
mineral
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Basalt River Stone
Aphanitic Mafic Igneous Rock
igneous
Basalt River Pebble
Extrusive mafic volcanic rock
igneous
Basalt (River Pebble)
Extrusive mafic igneous rock
igneous
Basalt (River Rock Cobble)
Extrusive mafic volcanic rock (Basalt)
igneous
Green Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Iron Nodule
Iron-manganese concretion (Fe-Mn hydroxide)
sedimentary