Fossilized Tabulate Coral (Honeycomb Coral)
Favosites (Order: Tabulata)
sedimentary
Category
Organic (Often Found By Beachcombers)
Browse organic (often found by beachcombers) specimens identified by the Rock Identifier community.
Learn about Organic (Often Found By Beachcombers) in the encyclopedia
View all →
Porfido (Porphyritic Rock)
Porphyry (often Rhyolitic or Andesitic)
igneous
Ruby Fuchsite / Ruby in Fuchsite
Ruby (Al2O3 variety corundum) and Fuchsite (K(Al,Cr)2AlSi3O10(OH)2 - a chromium-rich variety of muscovite mica) in Quartz matrix
Mineral
Ferrous Slag
Fused calcium-iron silicates (Industrial Slag)
Anthropogenic/Industrial byproduct
Sandstone Concretion
Ferruginous Sandstone Concretion (SiO2 + FeO(OH))
sedimentary
Slag
Glassy silicate byproduct (anthropogenic material)
industrial byproduct
Milky Quartz
Silicon dioxide (SiO2)
mineral
Chrysocolla in Matrix
Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Silicate/Secondary Copper Mineral)
mineral
Limonite/Goethite nodule
Goethite (FeO(OH)) with Hydrated Iron Oxides
mineral
Sandstone (Picture Sandstone)
Arenite (primarily SiO2)
sedimentary
Chert (Flinty variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Yellow Quartzite River Stone
Quartzite (SiO2)
metamorphic
Green Aventurine
Silicon dioxide (SiO2) with Fuchsite inclusions
mineral
Quartzite
Quartzite (SiO2 equivalent)
metamorphic
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Milky Quartz (or Bull Quartz)
Silicon Dioxide (SiO2)
mineral
Slag Glass
Silicon dioxide with impurities
mineral
Chrysocolla Cuprite
Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla) and Cu2O (Cuprite)
mineral composite
Copper Nugget
Native Copper (Cu)
mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Dragon Blood Jasper
SiO2
mineral
Chalcopyrite
Copper Iron Sulfide (CuFeS2)
mineral
Prehnite
Prehnite, Ca2Al(AlSi3O10)(OH)2
mineral
Quartzite with Iron Staining
Quartzite (primarily SiO2 with Fe2O3 staining)
metamorphic
Laterite
Laterite (primarily composed of hydrated oxides of iron and aluminum)
Sedimentary Rock (as a residual soil/rock, it's often considered a type of sedimentary rock due to its formation from weathering, though it can cross into soil science)
Bornite (Peacock Ore)
Bornite (Copper iron sulfide - Cu5FeS4)
mineral
Quartz Vein in Host Rock (often Granite or Schist)
Silicon Dioxide (SiO2) within host matrix
mineral with metamorphic or igneous host
Quartz Vein in Host Rock (Gneiss/Schist)
Silicon Dioxide (SiO2) within a metamorphic matrix
metamorphic
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Rose Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Green Quartzite (or Green Jasper)
Silica (Silicon Dioxide, SiO2) with inclusions
metamorphic
Gold Nugget
Native Gold (Au)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Granodiorite
Granodiorite (Intermediate plutonic rock)
igneous
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Jasper
Silicon dioxide (SiO2)
Mineral / Sedimentary
Orange Quartzite (or Iron-Stained Quartz)
Silicon Dioxide (SiO2) with Iron Oxide impurities (Fe2O3)
metamorphic
Malachite
Copper carbonate hydroxide, Cu2CO3(OH)2
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
Sedimentary
Chert (variations include Flint/Jasper)
Chert (SiO2)
sedimentary