Quartzite Pebble
Quartzite (SiO2 with minor impurities)
metamorphic
Category
Organic (Often Found By Beachcombers)
Browse organic (often found by beachcombers) specimens identified by the Rock Identifier community.
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Limestone (River Stone)
Calcite-rich Sedimentary Rock (CaCO3)
sedimentary
Nephrite Jade
Ca2(Mg, Fe)5Si8O22(OH)2
metamorphic
Eurasite (or Ferruginous Sandstone)
Ferruginous Sandstone (SiO2 with Fe2O3/FeOOH)
sedimentary
Carnelian (Agate)
SiO2 (Silicon Dioxide with Iron Oxide impurities)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Sodalite
Sodalite (Sodium Aluminum Silicate Chloride) - Na8(Al6Si6O24)Cl2
mineral
Chert (Flint Gravel)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chalcedony (specifically Agate or Carnelian)
Silicon Dioxide (SiO2)
mineral
Chert (Quartz-rich)
Microcrystalline Silica (SiO2)
sedimentary
Rose Quartz
SiO2 (Silicon Dioxide with trace inclusions of dumortierite)
mineral
Quartzite Pebble
Metamorphic Quartzite (SiO2)
metamorphic
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Drill Core Sample
Cylindrical Rock Core (Specific mineralogy varies by extraction site)
Metamorphic (Likely Gneiss or Schist based on texture)
Yellow Quartzite
Quartzite (SiO2 with iron oxide inclusions)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Mosasaur Tooth Fossil
Mosasauridae (likely Prognathodon or Mosasaurus)
fossil
Quartzite
Quartzite (primarily SiO2)
metamorphic
Chrysocolla
Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Hydrated Copper Phyllosilicate)
mineral
Diorite (Porphyritic)
Porphyritic Diorite
igneous
Malachite
Copper(II) carbonate hydroxide, Cu2CO3(OH)2
mineral
Schorl (Black Tourmaline) in Quartz/Feldspar Matrix
NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
mineral
Banded Calcite (often sold as Mexican Onyx)
Calcium Carbonate (CaCO3)
sedimentary
Chert Nodules (with Gryphaea or Shell inclusions)
Microcrystalline Quartz (SiO2) with Calcitic inclusions
sedimentary
Amethyst Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Quartz with Schorl inclusions
Silicon Dioxide (SiO2) with Sodium Iron Aluminum Borosilicate Hydroxide (Black Tourmaline)
mineral
Ferruginous Sandstone
Arenite with Iron-Oxide Cement (SiO2 with Fe2O3/FeO(OH))
sedimentary
Amethyst
Quartz (SiO2) variety
Mineral
Quartzite
Quartzite (SiO2)
metamorphic
Red Jasper
Jasper (a variety of Chalcedony, SiO₂ with impurities)
Mineral
Beryl (likely Emerald or Aquamarine in matrix)
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Amethyst
Amethyst (SiO2 - Silicon Dioxide with Iron impurities)
mineral
Yellow Chalcedony (Agate/Carnelian)
Silicon Dioxide (SiO2)
mineral
Ironstone Concretion (Moqui Marble type)
Ironstone Concretion (Fe2O3 with SiO2 core)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite (River Stone)
Quartzite (composed primarily of Silicon Dioxide, SiO2)
metamorphic
Green Quartzite (River Stone)
Metamorphic Quartz (SiO2) with inclusions (typically Fuchsite or Chlorite)
metamorphic
Fossilized Shark Tooth (Otodus obliquus)
Otodus obliquus (Mineral composition: Bio-apatite/Calcium Phosphate replaced by various minerals)
sedimentary (fossil)
Quartzite with Hematite
Metamorphosed Quartz Sandstone (SiO2 with Fe2O3 inclusions)
metamorphic
Gold Nugget
Native Gold (Au)
mineral
Sardonyx
Silicon Dioxide (SiO2) with iron oxide impurities
mineral