Milky Quartz
Silicon Dioxide (SiO2)
mineral
Category
Organic (Often Found By Beachcombers)
Browse organic (often found by beachcombers) specimens identified by the Rock Identifier community.
Chert (Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Obsidian
Obsidian (Volcanic Glass)
igneous
Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Nephrite Jade
Nephrite (a variety of the Calcium magnesium iron silicate mineral series Actinolite), Ca2(Mg, Fe)5Si8O22(OH)2
metamorphic
Yellow Calcite
Calcium Carbonate (CaCO3)
Mineral
Specular Hematite (Specularite)
Iron Oxide (Fe2O3)
mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Yellow Quartzite
Quartzite (SiO2)
metamorphic
Epidote
Epidote - {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
mineral
Fuchsite in Quartz
K(Al,Cr)2(AlSi3O10)(OH)2 in SiO2
metamorphic
Chert (Nodular)
Cryptocrystalline Quartz (SiO2)
sedimentary
White Topaz
Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Howlite
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Howlite
Howlite (Calcium borosilicate hydroxide: Ca2B5SiO9(OH)5)
mineral
Sandstone (Quartzose)
Arenite (composed mainly of SiO2)
sedimentary
Fossiliferous Limestone (Bivalve Fossil)
Calcium Carbonate (CaCO3) with Bivalvia fossil
sedimentary
Tektite (specifically Indochinite)
Tektite (Natural silica glass)
Mineraloid (Impact glass)
Silver (Native or Alloyed)
Ag (Argentum)
mineral
Specular Hematite
Specularite (Iron Oxide, Fe2O3)
mineral
Chert (or Flint)
Silicon dioxide (SiO2)
sedimentary
Chert Concretion (with typical hematite/limonite staining)
Sedimentary Concretion (SiO2 with FeO(OH)⋅nH2O)
sedimentary
Green Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Jasper Breccia
Brecciated Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Serpentine
Antigorite, Lizardite, or Chrysotile (Mg,Fe)3Si2O5(OH)4
metamorphic
Sodalite
Sodalite - Na8(Al6Si6O24)Cl2
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Dalmatian Stone (commonly Dyed)
Dalmatian Jasper (Peralkaline igneous rock)
igneous
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Clear Quartz
Silicon dioxide (SiO2)
mineral
Sandstone (likely Iron-rich or Arkosic)
Arenite (SiO2 with FeO(OH) or Fe2O3 staining)
sedimentary
Quartz (Citrine or Smoky variant)
Silicon Dioxide (SiO2)
mineral
Demantoid Garnet on Matrix
Demantoid (variety of Andradite Garnet) - Ca3(Fe3+)2(SiO4)3
mineral
Emerald in Schist (Raw/Tumbled)
Beryllium Aluminum Silicate (Be3Al2Si6O18) with Chromium/Vanadium impurities in Mica Schist
metamorphic