Man Made Object (Ring)

Browse man made object (ring) specimens identified by the Rock Identifier community.

Peridotite (Pyroxenite/Serpentinized Dunite)

Ultramafic Rock (consisting primarily of Olivine and Pyroxene)

igneous

Ironstone Nodule (Ironstone Concretion)

Siderite-rich Mudstone (FeCO3) or Limonite (FeO(OH)·nH2O)

sedimentary

Granite

Granite (composed primarily of Quartz (SiO2), Alkali Feldspar, and Plagioclase)

igneous

Botryoidal Agate

Chalcedony (Silicon Dioxide, SiO2)

mineral

Sandstone (Ferruginous)

Arenite (with Hematite/Limonite cement)

sedimentary

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

mineral

Limestone

Calcium Carbonate (CaCO3)

sedimentary

Gold Nugget

Native Gold (Au)

mineral

Basalt with Weathering Crust

Extrusive mafic volcanic rock

igneous

Black Obsidian

Volcanic Glass (predominantly SiO2)

igneous

Native Gold (in Jewelry)

Gold (Au)

mineral

Chert Nodule (with Flint core)

Sedimentary Cryptocrystalline Quartz (SiO2)

sedimentary

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

metamorphic

Schist

N/A (a rock type, not a mineral formula)

metamorphic

Granite

Granite (Phaneritic Quartz-Feldspar Felsic Rock)

igneous

Sandstone

Arenite (composed primarily of SiO2)

sedimentary

Sandstone

Arenite (primarily SiO2)

sedimentary

Milky Quartz (with trace inclusions)

Silicon Dioxide (SiO2)

mineral

Garnet

Almandine (Fe3Al2(SiO4)3)

mineral

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

igneous

Jasper or Chert

Silicon Dioxide (SiO2)

sedimentary

Greywacke

Greywacke (Lithofeldspathic Sandstone)

sedimentary

Scoria (Lava Rock)

Scoria

igneous

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

metamorphic

Quartz (Milky/Smoky variety)

Silicon Dioxide (SiO2)

mineral

Jade (specifically Nephrite or Jadeite beads)

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2) or Jadeite (NaAlSi2O6)

metamorphic

Gold Nugget

Native Gold (Au)

mineral

Granite

Granite (Felsic Plutonic Rock)

igneous

Pebble (likely Quartz or Chert)

SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.

Sedimentary Rock

Quartz Geode Fragment

Silicon Dioxide (SiO2)

mineral

Basaltic Tuff / Volcanic Breccia

Pyroclastic Breccia / Lithic Tuff

igneous

Silver (Sterling Silver Jewelry)

Argentum (Ag) mixed with Copper (Cu)

mineral

Quartz (likely a form of massive or vein quartz)

Quartz (SiO₂)

Mineral

Pebble (likely a type of sandstone or quartzite pebble)

Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.

Sedimentary rock