Agate
Silicon Dioxide (SiO2)
mineral
Category
Mineral (Specifically A Gemstone Variety)
Browse mineral (specifically a gemstone variety) specimens identified by the Rock Identifier community.
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
Mineral
Chrysocolla
Hydrated copper silicates (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Quartz (likely) / Siliceous rock with quartz phenocrysts (if a rock fragment)
Quartz (SiO₂)
Mineral
Peridot
Olivine (Mg,Fe)2SiO4
Mineral
Carnelian (Chalcedony variety)
SiO2 (Silicon Dioxide)
Mineral
Chert (specifically Tan Chert or Flint)
Silicon Dioxide (SiO2)
sedimentary
Emerald
Emerald (Beryl variety); Be3Al2(SiO3)6 with Chromium/Vanadium impurities
mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Limonite after Pyrite (Prophecy Stone)
Limonite (FeO(OH)·nH2O) replacing Pyrite (FeS2)
Mineral pseudomorph
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz (Milky or Cloudy Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Veined Rock (Likely Graywacke or Quartzite)
Silicon Dioxide (SiO2) veins in Metasedimentary matrix
metamorphic
Sandstone (specifically Picture Sandstone or Wonderstone)
Arenite (composed primarily of SiO2)
sedimentary
Chert (specifically Flint or Common Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Glauconitic Sandstone (Greensand)
Glauconitic Sandstone ((K, Na)(Fe3+, Al, Mg)2(Si, Al)4O10(OH)2)
sedimentary
Basalt
Basalt (composition of plagioclase feldspar and pyroxene)
Igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Chert (specifically tan/pink variety)
Silicon Dioxide (SiO2)
sedimentary
Pink Tourmaline (Rubellite)
Elbaite - Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3OH
mineral
Chert (specifically Yellow Jasper/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Fossil Shark Tooth (Otodus obliquus)
Otodus obliquus; hydroxyapatite (mineralized form Ca5(PO4)3(OH))
sedimentary (fossiliferous)
Smoky Quartz Cluster
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Citrine Quartz
Crystalline Silicon Dioxide (SiO2) with Ferric Iron impurities
mineral
Quartz
Quartz (SiO2, Silicon Dioxide)
Mineral
Pink Pearl
Calcium Carbonate (Aragonite/Calcite) with Conchiolin (CaCO3)
mineral
Rose Quartz
Silicon dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Labradorite (specifically Larvikite beads)
Plagioclase Feldspar (Na,Ca)(Si,Al)4O8
igneous
Plagioclase Feldspar
Plagioclase Feldspar Series (NaAlSi3O8 - CaAl2Si2O8)
Mineral
Amber
Succinite (fossilized resin)
mineral
Red Sandstone (Hematitic)
Clastic sedimentary rock (SiO2 with Fe2O3 inclusions)
sedimentary
Carnelian Agate
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Quartz (Druzy or Crystalline variety)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky and Bull Quartz)
Silicon Dioxide (SiO2)
mineral
Chert (often referred to as Flint or Jasper when pigmented)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Agate
Silicon dioxide (SiO2) - variety Chalcedony
mineral
Bumblebee Jasper
Fossiliferous Volcanic Rock (composed of Calcium Carbonate, Manganese Oxides, and Arsenic Sulfides)
igneous
Chert (specifically Jasper or Flint type)
Microcrystalline Quartz (SiO2)
sedimentary
Pink Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Fossilized Angel Wing Shell
Cyrtopleura costata
sedimentary
Imperial Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz with Mineral Inclusions
Sedimentary
Mixed Tumbled Gemstones (Agate, Aventurine, Pyrite, etc.)
Multiple (principally Silicon Dioxide SiO2 and Iron Disulfide FeS2)
mineral