Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Category
Organic (Often Found By Beachcombers)
Browse organic (often found by beachcombers) specimens identified by the Rock Identifier community.
Limestone (specifically Dolomitic Limestone)
Calcium Magnesium Carbonate (CaMg(CO3)2)
sedimentary
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Granite (Pink/Red)
Phaneritic Plutonic Felsic Rock (major minerals: Quartz, Orthoclase Feldspar, Plagioclase Feldspar)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2) with Limonite/Goethite
mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Magnetite (Lodestone)
Magnetite (Fe3O4)
mineral
White Jade (Nephrite)
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2)
metamorphic
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Slag (Industrial Glass/Metal Waste)
Artificial silicate/ferro-silicate byproduct
Mineraloid (Industrial byproduct)
Yellow Jasper
Silicon Dioxide (SiO2) with iron inclusions
sedimentary
Chert (containing Quartz)
Microcrystalline Silica (SiO2)
sedimentary
Quartz / Common Agate
Silicon Dioxide (SiO2)
mineral
Jasper
Silicon dioxide (SiO2)
sedimentary
Tiger's Eye
Tiger's eye (Pseudomorph of Quartz after Crocidolite), SiO2
metamorphic
Olivine in Basalt matrix
Peridotite (Mg, Fe)2SiO4
igneous
Yellow Agate
Silicon Dioxide (SiO2)
mineral
Sandstone (Quartzose)
Arenite (composed primarily of SiO2)
sedimentary
Chert (Jasper/Flint variation)
Chert (SiO2)
sedimentary
Agate (Polished Nodule)
Agate (Silicon Dioxide, SiO2)
mineral
Celestite (Celestine)
Strontium sulfate (SrSO4)
Mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Limonite (Ironstone Concretion)
Limonite (Hydrous Ferric Oxides mixed with Goethite)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Chert (Nodule)
Crystalline Silicon Dioxide (SiO2)
sedimentary
Granite
Granite (Phaneritic Quartz-Feldspar Rock)
Igneous
Epidote (likely Unakite component or Epidosite)
Epidote (Ca2(Al2Fe)(SiO4)(Si2O7)O(OH))
metamorphic
Nephrite Jade
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2)
metamorphic
Orange Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Lazulite
Lazulite (MgAl2(PO4)2(OH)2)
mineral
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Gold in Quartz Matrix
Native Gold (Au) with Quartz (SiO2) and Slate/Shale
mineral
African Turquoise
African Turquoise (a trade name for Jasper, a variety of Chalcedony: SiO2)
sedimentary
Black Sapphire
Corundum (Al2O3 with inclusions of hematite or ilmenite)
mineral
Labradorite
Labradorite ((Ca, Na)(Al, Si)4O8)
mineral
Breciated Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
Mineral
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral