Granite Pegmatite
Coarse-grained Granite (SiO2 - Aluminum and Alkalies)
igneous
Category
Mineral Based Composite
Browse mineral based composite specimens identified by the Rock Identifier community.
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Orange chalcedony geode
Microcrystalline quartz (SiO₂), commonly called carnelian or orange agate when strongly colored
mineral
Sandstone (Banded Sandstone)
Clastic Sedimentary Rock (primarily SiO2 with iron oxide impurities)
sedimentary
Silver Nuggets (Natural or Cast)
Native Silver (Ag)
mineral
Graphite
Graphite (Carbon, C)
mineral
Gold Nugget
Native Gold (Au)
mineral
Schist
Schist (Crystalline metamorphic rock)
metamorphic
Granite
Phaneritic Plutonic Felsic Rock (K-Feldspar + Quartz + Plagioclase)
igneous
Feldspar (specifically Orthoclase)
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Banded Calcite (Green Onyx)
Calcium Carbonate (CaCO3)
sedimentary
Jasper
Silicon Dioxide (SiO2)
sedimentary
Sandstone Cobble
Arenite (Secondary classification based on grain size)
sedimentary
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Tumbled banded jasper (likely)
Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides; exact variety uncertain from the photo
mineral
Sandstone
Arenite
sedimentary
Granite pebble
Granite, chiefly quartz, potassium feldspar, and plagioclase, with dark biotite or amphibole
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Amethyst Sage Agate
Silicon Dioxide (SiO2) with trace minerals (Manganese/Iron oxides)
mineral
Amethyst Quartz (Amethyst Geode)
Silicon Dioxide (SiO2) with iron impurities
mineral
Travertine
Terrestrial Sedimentary Rock (CaCO3)
sedimentary
Sandstone (likely Graywacke or Lithic Sandstone)
Arenite / Wacke (SiO2 based with lithic fragments)
sedimentary
Likely chlorite-bearing schist (possibly greenschist)
Chlorite–quartz–mica schist; commonly contains muscovite/biotite and feldspar
metamorphic
River Cobble (Phyllite or Quartzite)
Metasedimentary Rock (often containing SiO2 or KAl2(AlSi3O10)(OH)2)
metamorphic
Granite
Intrusive Igneous Rock
igneous
Ferruginous Conglomerate (or Iron-Rich Concrete/Slag)
Clastic Sedimentary (Silicon Dioxide/Iron Oxide matrix)
sedimentary
Sandstone Geode (Unbroken)
Siliciclastic sedimentary rock (primarily Quartz)
sedimentary
Chrysocolla
Hydrated copper phyllosilicate (Cu,Al)2H2Si2O5(OH)4 nH2O
mineral
Quartz / Quartzite
Silicon Dioxide (SiO2)
metamorphic
Jasper Pendant
Chalcedony (Quartz) - SiO2
Mineral/Sedimentary
Banded calcite (onyx marble)
Calcite, CaCO₃; commonly sold as “honey onyx” or “Pakistan onyx”
mineral
Pink Quartz / Sea Glass
Silicon Dioxide (SiO2)
mineral
Goldstone beads (likely brown goldstone)
Man-made copper-bearing glass; not a natural mineral. Often sold as “aventurine glass.”
gemstone
Peacock Ore
Bornite (Cu5FeS4) or Chalcopyrite treated with acid
mineral
Sandstone (Quartz-rich)
Sandstone (SiO2 dominated)
sedimentary
Dyed druzy quartz geode
Quartz, silicon dioxide (SiO₂), likely artificially dyed
mineral
Probable weathered sulfide-bearing rock
Indeterminate; possibly pyrite- or chalcopyrite-bearing matrix
mineral
Rough quartz crystal, possibly smoky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Brick
Fired clay or Ceramic material (no specific mineralogical scientific name as it's a composite)
Man-made material (constructed)
Rhodonite
Manganese silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Blue Sapphire
Corundum (Al2O3)
mineral
White Topaz
Aluminum Silicate Fluoride Hydroxide; Al2SiO4(F,OH)2
mineral