Granite
Granite (Felsic intrusive igneous rock)
igneous
Category
Non Geological
Browse non geological specimens identified by the Rock Identifier community.
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Rough Diamond
Diamond (Native Element Carbon, C)
mineral
Peridot (likely, given the color and bead form)
Olivine, variety Peridot (Mg,Fe)2SiO4
Mineral
Black Tourmaline (Schorl)
Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)3OH)
mineral
Diorite
Diorite (intermediate intrusive igneous rock)
igneous
Fossilized Shark Tooth or Bone Fragment
Vertebrate Fossil (likely Carcharodon or similar genus)
fossil
Black Tourmaline (Schorl)
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Trace Fossil (Lichenandites or Rhynie Chert Chert with Microfossils)
Trace fossil in microcrystalline quartz (SiO2)
fossil
Tourmalinated Quartz
Quartz (SiO2) with Schorl (NaFe3Al6(BO3)3Si6O18(OH)4) inclusions
mineral
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Quartz-encrusted Matrix
Silicon Dioxide (SiO2) with Ferruginous Sandstone
sedimentary
Common Opal
Amorphous Hydrated Silica (SiO2·nH2O)
mineral
Quartz-veined metamorphic rock, likely greenschist or altered basalt
Chlorite–actinolite schist or metabasalt with a milky quartz vein
metamorphic
Raw Sapphire / Corundum
Corundum (Al2O3 - Aluminium oxide)
mineral
Galena (with Matrix)
Lead Sulfide (PbS)
mineral
Blue Sapphire
Corundum (Al2O3 with trace Titanium and Iron)
mineral
Muscovite Mica (with Quartz)
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Chondrite Meteorite
Ordinary Chondrite (Fe-Ni alloy, Olivine, Pyroxene)
Mineral
Sea Glass (White/Clear)
Amorphous Silica (Alkali-Lime-Silica Glass), SiO2 + Na2O + CaO
Anthropogenic (Man-made product subject to geological processes)
Basalt Pebble
Mafic Igneous Rock (Basalt/Diabase)
igneous
Barite
Barium sulfate (BaSO4)
mineral
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Indian Agate
Cryptocrystalline Quartz (SiO2)
mineral
Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Raw Sapphire (Corundum)
Aluminum oxide (Al2O3)
gemstone
Chert (Flint/Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Green Chert
Microcrystalline Quartz (SiO2)
sedimentary
Polished black stone egg, probably black obsidian
Obsidian, a natural volcanic glass; composition primarily silica-rich glass (approximately SiO₂), with variable iron and other trace elements
gemstone
Serpentine
Serpentine group minerals (e.g., Antigorite, Chrysotile, Lizardite). Chemical formula: (Mg, Fe)₃Si₂O₅(OH)₄
Mineral, often found as a rock (metamorphic)
Basalt
Basalt
igneous
Bauxite
Bauxite (Al2O3·2H2O)
sedimentary
Polished Ocean Jasper
Orbicular Jasper (variety of Chalcedony/Quartz, SiO2)
mineral
Sandstone with Liesegang Rings
Clastic Sedimentary Rock with Iron Oxide Precipitates (SiO2 + Fe2O3)
sedimentary
Yellow Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Sea Glass (Kelly Green)
Amorphous Silica (Silicon Dioxide with Iron/Chromium additives)
Anthropogenic specimen (Man-made material)
Blue Dyed Quartzite
Silicon Dioxide (SiO2) with artificial pigment
metamorphic
Sapphire
Corundum (Al2O3)
gemstone
Quartzite (River Pebble)
Recrystallized Quartz (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Common Green Opal
Hydrated amorphous silicon dioxide (SiO2·nH2O)
mineral
Raw Garnet (Hessonite / Spessartine)
Silicate mineral group (X3Y2(SiO4)3)
gemstone
Quartzite (Engineered Stone)
Silicon Dioxide (SiO2) based synthetic composite
metamorphic