Milky quartz-bearing rock, possibly quartzite
Quartz (SiO₂), likely in a quartzite or quartz-rich metamorphic matrix
metamorphic
Category
Mineral Based Alloy (Anthropogenic)
Browse mineral based alloy (anthropogenic) specimens identified by the Rock Identifier community.
Learn about Mineral Based Alloy (Anthropogenic) in the encyclopedia
View all →
Tumbled serpentine (likely bowenite)
Serpentine-group magnesium silicate; commonly antigorite, lizardite, or chrysotile (Mg₃Si₂O₅(OH)₄)
mineral
Sandstone (with banding/weathering)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Silver (S925)
Native Silver (Ag)
mineral
Garnet-set butterfly brooch
Likely almandine or pyrope garnet, iron–aluminum silicate (Fe₃Al₂Si₃O₁₂ or Mg₃Al₂Si₃O₁₂)
gemstone
Veined Limestone
Sedimentary Calcite-Veined Rock (CaCO3)
sedimentary
Shungite
Non-crystalline carbon (allotrope of carbon)
metamorphic
Magnetite-rich iron ore
Magnetite (Fe₃O₄), possibly massive magnetite/ironstone
mineral
Schalenblende
Sphalerite with Wurtzite, Galena, and Marcasite/Pyrite
mineral
Ferrosilicon Slag (Industrial Vitrified Glass)
Vitreous Silicate Residue
Antropogenic (Man-made industrial byproduct)
Sandstone
Arenite (SiO2 primarily)
sedimentary
Peach Aventurine
Silicon Dioxide (SiO2) with Hematite/Goethite inclusions
mineral
Kyanite
Kyanite (Al2SiO5)
mineral
Kyanite (in Schist Matrix)
Kyanite (Al2SiO5)
metamorphic
Fired Clay Brick (Anthropic Rock substitute)
Anthropogenic polycrystalline ceramic (predominantly Mullite and Quartz: Al6Si2O13 + SiO2)
metamorphic (man-made / anthropic)
Ruby / Pink Sapphire
Corundum (Al2O3 with Chromium impurities)
gemstone
Conglomerate
Clastic Sedimentary Rock (Conglomerate)
sedimentary
Green aventurine jade-style cabochon (likely dyed chalcedony or glass imitation)
Quartz/chalcedony, SiO₂; exact material is uncertain from the image
mineral
Banded Calcite (commonly traded as Green Onyx / Travertine Onyx)
Calcite (CaCO3) / Travertine
sedimentary
Pebble
Lithic fragment (Quartzite or general rock pebble)
sedimentary
Granite Pebble
Granite (Phaneritic intrusive igneous rock)
igneous
Milky quartz
Quartz (SiO₂)
mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Tumbled rose quartz (probable)
Quartz, silicon dioxide (SiO₂), rose-colored variety
mineral
Banded agate (likely quartz-rich chalcedony)
Microcrystalline quartz, SiO₂; possibly agate with a weathered iron-rich host rock
mineral
Native Copper
Native Copper (Cu)
mineral
River Rock
Mixed lithology clast
sedimentary
Gold in Quartz Matrix
Native Gold (Au) with Quartz (SiO2)
mineral
Beryl (Variety: Aquamarine/Green Beryl)
Beryllium Aluminum Silicate (Be3Al2Si6O18)
mineral
Green sea glass or green glass-like tumbled material
Amorphous silicate glass; likely anthropogenic soda-lime glass, not a natural mineral
mineral
Granodiorite
Granodiorite
igneous
Graphite
Graphite (Carbon, C)
mineral
Gold Nugget
Native Gold (Au)
mineral
River Cobble (Quartzite or Gneiss)
Metamorphic crystalline rock (predominantly SiO2 based)
metamorphic
Granite
Phaneritic Plutonic Felsic Rock (K-Feldspar + Quartz + Plagioclase)
igneous
Sandstone
Arenite
sedimentary
Rough Gemstone Grains (Mixed Sapphires and Quartz)
Corundum (Al2O3) and Quartz (SiO2)
mineral
Blue Sphalerite (likely dyed or treated Druzy Quartz/Agate)
Zinc Sulfide (ZnS) or Silicon Dioxide (SiO2) with trade-name enhancement
Mineral
Mica Schist
Mica Schist (predominantly Muscovite or Biotite sheet silicates)
metamorphic
Milky Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
mineral
Silver Nuggets (Natural or Cast)
Native Silver (Ag)
mineral
Sandstone (with Limonite/Iron Staining)
Arenite (SiO2 based) with FeO(OH) staining
sedimentary