Marble
Metamorphic Limestone (CaCO3)
Category
Browse mineral (man made aura treatment) specimens identified by the Rock Identifier community.
Marble
Metamorphic Limestone (CaCO3)
Sandstone (Quartz Arenite)
Sandstone (dominated by SiO2 quartz grains)
Tumbled orbicular granite
Granite, predominantly potassium feldspar, plagioclase, quartz, and biotite/hornblende
Sandstone (Quartzose)
Arenite (primarily SiO2)
Sandstone
Sedimentary Rock (Quartz arenite)
Pearl and Garnet Glass
Calcium Carbonate (CaCO3) for pearl; Silicon Dioxide (SiO2) for glass
Amber (Black)
Amber (succinite, retinite, etc., specifically, heavily included/dark varieties)
Tree Agate
Chalcedony (SiO2)
Swirled Agate Bead
Silicon Dioxide (SiO2)
Rough Diamond
Diamond (pure Carbon, C)
Natural Pearl (appearing in a jewelry setting)
Calcium Carbonate (mostly Aragonite), CaCO3 with Conchiolin
Amethyst (Tumbled Cabinet Stone)
Silicon Dioxide (SiO2) with iron impurities
Diamond
Native Carbon (C)
Breccia
Breccia
Obsidian (Black)
Obsidian (High-silica volcanic glass)
Sandstone
Arenite (SiO2 composition dominant)
Granite
Granite (phaneritic intrusive igneous rock consisting of quartz, feldspar, and mica)
Sandstone
Arenite (composed primarily of SiO2)
Fossilized Coral (Petoskey Stone / Hexagonaria)
Hexagonaria percarinata / Rugosa coral (CaCO3)
Peacock ore (iridescent chalcopyrite, possibly bornite)
Chalcopyrite, CuFeS₂; the iridescent surface may be natural tarnish or artificial acid treatment. Similar material is bornite, Cu₅FeS₄.
Petrified Wood
Silicified Wood (SiO2)
Blue Slag Glass
Amorphous Silica (Industrial byproduct)
Diamond in Kimberlite
Diamond in Kimberlite Matrix (Diamond: C, Kimberlite: complex Potassic Peridotite)
Dyed Blue Agate Slice
Silicon Dioxide (SiO2)
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
Chert (Flint)
Silicon dioxide (SiO2)
Asphalt Concrete
Bituminous Concrete / Asphaltic Composite
Chert (Yellow Jasper/Flint)
Chert (Microcrystalline Silicon Dioxide, SiO2)
Granodiorite
Granodiorite (Quartz + Plagioclase + Alkali Feldspar + Biotite/Hornblende)
Goldstone (Red)
Aventurine Glass
Sandstone
Arenite (variable SiO2 composition)
Granite
Felsic intrusive igneous rock
Rutilated Quartz
Quartz with Rutile inclusions (SiO2 with TiO2)
Chrysocolla
Hydrated copper phyllosilicate, (Cu,Al)2H2Si2O5(OH)4·nH2O
Citrine
Quartz (SiO2) - variety Citrine
Sandstone (Ferruginous)
Arenite (SiO2 with Fe2O3 inclusions)
Sandstone (likely Quartzose Sandstone)
Arenite
Marble
Recrystallized Calcite (CaCO3)
Diorite (River Pebble)
Intermediate Phaneritic Igneous Rock
Jasper / Chert (Red)
Cryptocrystalline quartz (SiO2)
Amethyst
Silicon Dioxide (SiO2)
Smoky Quartz
Silicon Dioxide (SiO2)