Bumblebee Jasper
Calcite-bearing Volcanic Tuff containing Orpiment (As2S3) and Realgar (As4S4)
sedimentary
Category
Mineral Based Alloy (Anthropogenic)
Browse mineral based alloy (anthropogenic) specimens identified by the Rock Identifier community.
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Chert (Arrowhead Preform)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Quartzite (River Cobble)
Quartzite (mostly SiO2)
metamorphic
Blue Goldstone
Aventurine Glass (Silicon Dioxide infused with Cobalt/Copper)
Synthetic (Man-made Glass)
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Firewood (Wood Log)
Lignum (Plant tissue composed of cellulose and lignin)
Organic (Non-geological)
Chert (specifically Yellow Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Scoria (Vesicular Basalt)
Vesicular Basalt
igneous
Gold Nugget / Flake
Native Gold (Au)
mineral
Gold Nugget
Native Gold (Au)
mineral
Water and Silt (Sedimentary Environment)
Suspended Sediment / H2O (dihydrogen monoxide)
sedimentary
Pebble (likely Limestone or Siltstone)
Lithic fragment (calcareous or siliciclastic)
sedimentary
Fired Clay Brick (Anthropic Rock substitute)
Anthropogenic polycrystalline ceramic (predominantly Mullite and Quartz: Al6Si2O13 + SiO2)
metamorphic (man-made / anthropic)
Cullet (Slag Glass)
Amorphous Silica (SiO2) with various metal oxide colorants
mineraloid / anthropogenic
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
US Penny
Cuprum (Copper: Cu) and Zincum (Zinc: Zn) Alloy
Man-made object (metal alloy)
Diamond
Native Carbon (C)
mineral
Gold Nugget
Native Gold (Au)
mineral
Fossilized Turritella Gastropod (Internal Mold)
Turritella (Fossil Gastropod Crust)
sedimentary
Quartzite
Quartzite (SiO2 silicon dioxide)
metamorphic
Favosite Fossil (Calyx or Rugose Coral)
Favosites (Extinct Tabulate Coral)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Exposed Aggregate Concrete (Pea Gravel)
Concrete with Siliceous Alluvial Gravels
sedimentary (man-made conglomerate)
Coarse Sand or Fine Gravel
Detrital Sedimentary Fragments (mostly SiO2)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Wallboard/Drywall (Gypsum-based)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
sedimentary
Tree Agate
Silicon dioxide (SiO2)
Mineral
Granite
Felsic Intrusive Igneous Rock
igneous
Pink Granite
Phaneritic Plutonic Intrusive Rock (Granite)
igneous
Coquina / Fossiliferous Limestone
Coquina (composed primarily of Calcium Carbonate / CaCO3)
sedimentary
Banded Calcite (often sold as Onyx Marble)
Calcite (Calcium Carbonate, CaCO3)
sedimentary
River Pebble (Gneiss or Quartzite mixture)
Metamorphic rock (Commonly Gneissic)
metamorphic
Mahogany Obsidian
Volcanic glass containing Magnetite/Hematite
igneous
Shungite
Non-crystalline carbon (Fullerenes / Carbon-60)
metamorphic
Banded Calcite (often sold as Onyx or Mexican Onyx)
Calcite (Calcium Carbonate, CaCO3)
sedimentary
Pink Granite Pebble
Granite (Phaneritic igneous rock)
igneous
Chert (Red Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Chert Nodule)
Microcrystalline quartz (SiO2)
sedimentary
Dinosaur Bone
Agatized Dinosaur Bone
sedimentary/fossil
Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral