Septarian Nodule
Septarian Concretion (CaCO3 with Siderite/Limonite streaks)
sedimentary
Category
Mineral Based Alloy (Anthropogenic)
Browse mineral based alloy (anthropogenic) specimens identified by the Rock Identifier community.
Iron Meteorite
Siderite (Fe, Ni)
igneous
Epidote
Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)
mineral
Wishing Stone (Basalt/Greywacke with Quartz Vein)
Basalt or Siltstone with SiO2 (Quartz) hydrothermal intrusion
igneous/sedimentary
Dalmatian Stone (Dalmatian Jasper)
Peralkaline Quartz-Feldspar Rock with Arfvedsonite
igneous
Quartz with Mica (Micaceous Quartz)
Silicon Dioxide (SiO2) with Phyllosilicates
igneous/metamorphic
Sedimentary Breccia
Breccia (Clastic Sedimentary Rock)
sedimentary
Grey River Pebble (Likely Quartz-rich or Limestone)
Clastic Sedimentary Rock (typically SiO2 or CaCO3 based)
sedimentary
Anthracite Coal
Anthracite (Carbon-based sedimentary-derived metamorphic rock)
metamorphic
Ferruginous Conglomerate
Ferruginous Conglomerate (Clastic Sedimentary Rock)
sedimentary
Granite
Granite (phaneritic felsic intrusive rock)
igneous
Chert (and Chert-based Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Sedimentary
K2 Stone (or K2 Jasper)
Azurite-in-Granite (Potassium Feldspar, Quartz, Plagioclase, Muscovite, and Azurite)
igneous
Basalt Porphyry
Porphyritic Basalt
igneous
Diamond
Diamond (C)
Mineral
Dendritic Quartz Pebble
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral
Ironstone (likely Ferruginous Siltstone/Sandstone)
Ferruginous sedimentary rock (FeOx-rich clastic)
sedimentary
Conglomerate
Clastic sedimentary rock (Polymictic Conglomerate)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Rhyolitic Tuff
Rhyolitic Tuff / Pyroclastic rock
igneous
Green Aura Quartz (Titanium treated Kyanite or Quartz)
Silicon Dioxide (SiO2) or Aluminum Silicate (Al2SiO5) with Titanium/Metal Oxide coating
mineral (man-made aura treatment)
Epidote
Epidote (formula: Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
mineral
Ring with an Orange Inlay
N/A (Man-made object)
Man-made Object (Ring)
Rose Quartz (tumbled)
Rose Quartz (variety of Quartz, chemical formula SiO₂)
Mineral
Iron Meteorite (likely Chondrite or Iron-Nickel fragment)
Siderite (Iron Meteorite), primarily Fe-Ni (Iron-Nickel) alloy
igneous
Agate
Agate (a cryptocrystalline variety of Quartz, SiO₂)
Mineral
Amber (specifically Red or Cherry Amber)
Succinite (Resinite); Chemical formula: C10H16O
Mineraloid
Granite / Quartz Vein Rock
Granitoid with Quartz (SiO2)
igneous
Basalt
Mafic volcanic rock (primarily plagioclase feldspar and pyroxene)
igneous
Garnet (likely Almandine, Pyrope, or a blend)
Garnet group minerals: X3Y2(SiO4)3, where X and Y represent various metal ions (e.g., Almandine: Fe3Al2(SiO4)3, Pyrope: Mg3Al2(SiO4)3)
Mineral
Chalcedony
Chalcedony (SiO₂)
Mineral
Fossil Shark Tooth
Carcharodon sp. (likely Otodus or similar Lamniformes order)
sedimentary
Druzy Quartz on Limestone
Silicon Dioxide (SiO2)
mineral
Amethyst or Smoky Quartz Geode Slice
Crystalline Silicon Dioxide (SiO2) with iron impurities
mineral
Concrete with Aggregate
Artificial Conglomerate (Cement and Aggregate)
sedimentary
Dragon Vein Agate
Silicon Dioxide (SiO2)
mineral
Chalcedony (Agate Pebble)
Silicon Dioxide (SiO2)
mineral
Blue Goldstone
Aventurine Glass (Silicon Dioxide with metal inclusions)
man-made glass mineral simulant
Mica Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic
Anthracite Coal
Anthracite (Carbon-based metamorphic rock, 86-97% C)
metamorphic
Titanium Aura Quartz
Titanium bonded Silicon Dioxide (SiO2 + Ti)
mineral
Dyed Quartz Geode
Silicon Dioxide (SiO2) with artificial pigment
mineral