Basalt
Basalt (Mafic Extrusive)
igneous
Category
Not A Natural Rock (Man Made Composite)
Browse not a natural rock (man made composite) specimens identified by the Rock Identifier community.
Milky Quartz
Quartz (SiO2)
Mineral
Silver (Sterling Silver)
Argentum (Ag) mixed with Copper (Cu); Formula: Ag+Cu
mineral
Jasper (Multi-colored) / Sea Glass Slag
Silicon Dioxide (SiO2) with impurities of Iron Oxide
Sedimentary (if natural Jasper) or Artificial (if Slag)
Granite
Granite (Felsic Plutonic Rock)
igneous
Petrified Wood
Silicified wood (Quartz variant, SiO2)
sedimentary
Pearl (Imitation or Cultured)
Calcium Carbonate (Aragonite/Calcite) - CaCO3
Mineraloid (Organic)
Diamond (Cut Specimen)
Carbon (C)
mineral
Apache Tear (Obsidian)
Obsidian / Amorphous Volcanic Glass (primarily SiO2)
igneous
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
mineral
Basalt (River Pebble)
Basalt (extrusive mafic rock)
igneous
Jasper with Quartz Vein
Silicon Dioxide (SiO2) with impurities
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Obsidian (likely Golden Sheen Obsidian or Rainbow Obsidian, given the subtle sheen visible on some beads)
Obsidian (volcanic glass, predominantly SiO2 with various impurities)
Igneous
Amber
Succinite (fossilized tree resin)
mineraloid
Rough Diamond
Diamond (pure carbon, C)
mineral
Satin Spar (Selenite)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Jasper pebble
Jasper (Silicon Dioxide, SiO2)
sedimentary
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Quartz (specifically Milky or Rose Quartz)
Silicon Dioxide (SiO2)
mineral
Amber
Succinite (fossilized tree resin)
Organic Mineraloid
Chert (specifically Flint Arrowhead)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Red Jasper (possibly Wonderstone)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Diamond
Diamond (C)
Mineral
Limonite with Iron Inclusions
Limonite (Hydrated Iron Oxide, FeO(OH)·nH2O)
sedimentary
Diamond (in a jewelry setting)
Carbon (C)
mineral
Emerald
Beryl (Be₃Al₂Si₆O₁₈), specifically the green variety colored by trace amounts of chromium or vanadium.
Mineral
Strawberry Quartz (Hematoid Quartz)
Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)
mineral
Obsidian
Volcanic glass (SiO2 - Silicon Dioxide)
Igneous
Blue Goldstone
Aventurine Glass (SiO2 with Co and metallic inclusions)
mineral (synthetic glass)
Obsidian
Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)
Igneous
Granite (Light-colored quartz/feldspar variety)
Granite (composed primarily of Quartz SiO2 and Feldspar KAlSi3O8)
igneous
Diamond (Rough)
Diamond (Carbon, C)
Mineral
Diamond
Diamond (pure Carbon, C)
mineral
Chert (or Flint)
Chert (microcrystalline or cryptocrystalline quartz, SiO2)
Sedimentary
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Basalt
Vesicular Basalt
igneous
Basalt
Basalt (composition predominately Plagioclase feldspar and Pyroxene)
igneous
Basalt with Vesicles
Vesicular Basalt (comprising Plagioclase Feldspar, Pyroxene, and Olivine)
igneous
Libyan Desert Glass
Impactite silica glass (SiO2)
tektite (impact glass)