Orange chalcedony geode
Microcrystalline quartz (SiO₂), commonly called carnelian or orange agate when strongly colored
mineral
Category
Mineral Based Composite
Browse mineral based composite specimens identified by the Rock Identifier community.
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Banded Calcite (Green Onyx)
Calcium Carbonate (CaCO3)
sedimentary
Milky Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
mineral
Granite Pegmatite
Coarse-grained Granite (SiO2 - Aluminum and Alkalies)
igneous
Pink Feldspar / Rhodochrosite (Tumbled Pink Quartzite)
SiO2 (Quartz) / KAlSi3O8 (Potassium Feldspar)
mineral
Jasper
Silicon Dioxide (SiO2)
sedimentary
Amethyst Sage Agate
Silicon Dioxide (SiO2) with trace minerals (Manganese/Iron oxides)
mineral
Sandstone (Ferruginous)
Sandstone (mainly SiO2 with Fe2O3 staining)
sedimentary
Schist
Schist (Crystalline metamorphic rock)
metamorphic
Silver Nuggets (Natural or Cast)
Native Silver (Ag)
mineral
Granite
Phaneritic Plutonic Felsic Rock (K-Feldspar + Quartz + Plagioclase)
igneous
River Cobble (Quartzite or Gneiss)
Metamorphic crystalline rock (predominantly SiO2 based)
metamorphic
Amethyst Quartz (Amethyst Geode)
Silicon Dioxide (SiO2) with iron impurities
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Sandstone (with Limonite/Iron Staining)
Arenite (SiO2 based) with FeO(OH) staining
sedimentary
Travertine
Terrestrial Sedimentary Rock (CaCO3)
sedimentary
Feldspar (specifically Orthoclase)
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Ferruginous Conglomerate (or Iron-Rich Concrete/Slag)
Clastic Sedimentary (Silicon Dioxide/Iron Oxide matrix)
sedimentary
Brick
Fired clay or Ceramic material (no specific mineralogical scientific name as it's a composite)
Man-made material (constructed)
Graphite
Graphite (Carbon, C)
mineral
Gold Nugget
Native Gold (Au)
mineral
Marble (Sculpted Statue)
Metamorphic Limestone (composed primarily of Calcite, CaCO3)
metamorphic
Sandstone
Arenite
sedimentary
Quartz / Quartzite
Silicon Dioxide (SiO2)
metamorphic
Banded calcite (onyx marble)
Calcite, CaCO₃; commonly sold as “honey onyx” or “Pakistan onyx”
mineral
Pink Quartz / Sea Glass
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Opalite (likely man-made opalescent glass)
Opalite; not a true mineral, typically synthetic opalescent glass (silica-based)
mineral
Sandstone (with Laminations)
Clastic sedimentary rock (primarily Quartz-based)
sedimentary
Jasper Pendant
Chalcedony (Quartz) - SiO2
Mineral/Sedimentary
Conglomerate
Conglomerate (Clastic Sedimentary Rock)
sedimentary
Rhodonite
Manganese silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Sandstone Geode (Unbroken)
Siliciclastic sedimentary rock (primarily Quartz)
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
Chrysocolla
Hydrated copper phyllosilicate (Cu,Al)2H2Si2O5(OH)4 nH2O
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
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
Peacock Ore
Bornite (Cu5FeS4) or Chalcopyrite treated with acid
mineral
Sandstone (Quartz-rich)
Sandstone (SiO2 dominated)
sedimentary
Blue Sapphire
Corundum (Al2O3)
mineral