Honey Calcite Sphere
Calcium Carbonate (CaCO3)
mineral
Category
Organic (Geological Relative)
Browse organic (geological relative) specimens identified by the Rock Identifier community.
Goniatite Fossil
Order Goniatitida
fossil
Rough Amber (likely Copal or immature Amber)
Organic gemstone / Succinite (if Baltic)
mineral
Picasso Jasper (or Picasso Marble)
Metamorphosed Limestone (Calcium Carbonate, CaCO3, with impurities)
metamorphic
Chert in Limestone (or Flint Nodule)
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Orange Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Quartz pebble or seed/crumb
SiO2 (if quartz)
mineral
Basalt
Mafic extrusive igneous rock
igneous
Quartz with Magnetite or Schorl inclusion
Silicon Dioxide (SiO2) with Fe3O4 or NaFe3(Al6)(BO3)3Si6O18(OH)4
metamorphic
Moqui Marble (Ironstone Concretion)
Iron Oxide Concretion (Fe2O3 / FeO(OH))
sedimentary
Fossilized Sand Dollar
Echinoidea (Clypeasteroida)
fossil
Green Aventurine
Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
mineral
Banded Calcite (often sold as Mexican Onyx)
Calcium Carbonate (CaCO3)
mineral
Basalt
Basalt
Igneous
Basalt
Basalt
igneous
Moqui Marble
Iron Oxide Concretion (Hematite/Goethite-cemented Sandstone)
sedimentary
Limonite (Iron Ore / Ochre)
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
mineral
Banded Chert
Silicon Dioxide (SiO2)
sedimentary
Green copper-mineral specimen, likely chrysocolla or copper-bearing serpentine
Tentatively chrysocolla (hydrated copper phyllosilicate, approximately (Cu,Al)2H2Si2O5(OH)4·nH2O); exact identification requires testing
mineral
Amber
Succinite (fossilized resin)
mineral
Basalt (River Pebble)
Basalt
igneous
Limonite Concretion
Goethite-Limonite (FeO(OH)·nH2O)
sedimentary
Pyrite with Iron Oxides (Fool's Gold in Matrix)
Iron Sulfide (FeS2)
mineral
Limonite Concretion
Goethite/Limonite (FeO(OH)·nH2O)
sedimentary
Vesicular Basalt (Scoria)
Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
igneous
Basalt
Extrusive Igneous Rock
igneous
Chert Nodules in Limestone
Microcrystalline Quartz (SiO2) in Carbonate Matrix
sedimentary
Ironstone Concretion
Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)
sedimentary
Amber (Copal)
Organic gemstone, fossilized tree resin (often immature amber or copal)
Mineral
Howlite (tumbled stone)
Howlite, Ca₂B₅SiO₉(OH)₅
mineral
Amber (Dark/Black Variety)
Succinite (Resinite), C10H16O
mineral
Ironstone Concretion (Pot Stone)
Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)
sedimentary
Moqui Marble
Ironstone Concretion (Ferruginous sandstone)
sedimentary
Ironstone Concretion / Limonite Specimen
Goethite and Limonite (Hydrous Iron Oxides)
sedimentary
Red Coral
Corallium rubrum (Calcium Carbonate, CaCO3 with Carotenoid pigments)
Mineraloid (Organic Gemstone)
Vesicular Basalt (Lava Rock)
Vesicular basalt
igneous
Basalt (Vesicular)
Extrusive mafic igneous rock
igneous
Soil with Mineral Detritus and Quartz Fragments
Regolith / Silicate Mineral Aggregate
sedimentary
Horse Chestnut (Buckeye seed)
Aesculus hippocastanum seed
Organic (Non-geological)
Quartz-veined Sandstone
Quartzite-veined Arenite / SiO2 and quartz sand
sedimentary
Chalcopyrite
Copper Iron Sulfide (CuFeS2)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral