Mineral (Processed Metal)

Browse mineral (processed metal) specimens identified by the Rock Identifier community.

Shale

Shale (fine-grained clastic sedimentary rock)

Sedimentary

Quartz

Quartz (SiO₂ - Silicon Dioxide)

mineral

Amethyst Geode/Cluster

Quartz (SiO2) - variety Amethyst

Mineral

Petrified Wood

Silicified wood, primarily composed of Quartz (SiO2)

Mineral, often found in sedimentary deposits

Quartz

Quartz (SiO₂)

Mineral

Greywacke (likely)

Greywacke (a type of sandstone)

Sedimentary

Iron Ore / Ironstone Concretion

Mixture of iron oxide/hydroxide minerals, likely some combination of Hematite (Fe2O3), Goethite (α-FeOOH), and Limonite (a general term for hydrated iron oxides of variable composition) or potentially Bauxite (a mixture of aluminum hydroxides, often with iron oxides, (Al(OH)3) and FeO(OH)). The visual characteristics strongly suggest iron-rich material.

Mineral, specifically an iron ore

Scoria

Scoria (a vesicular basalt or andesite)

igneous

Banded Metamorphic Rock (likely Quartzite or Serpentinite/Soapstone)

Metamorphic Rock (possibly a banded Quartzite or a foliated Serpentinite/Talc Schist based on appearance, general term for such a rock is 'Banded Metamorphic Rock' or 'Gneiss' if pronounced banding of different minerals)

Metamorphic

Marble

Marble (metamorphosed limestone/dolostone). Predominantly composed of Calcite (CaCO3) for marble derived from limestone, or Dolomite (CaMg(CO3)2) for marble derived from dolostone.

Metamorphic Rock

Golden Sheen Obsidian

Obsidian (volcanic glass) with inclusions of gas bubbles and mineral crystals (e.g., hematite, magnetite) causing the sheen

igneous

Puddingstone

Conglomerate (specifically a type of jasper conglomerate or quartz conglomerate)

Sedimentary

Diamond

Diamond (carbon allotrope), C (chemical formula)

Mineral

Fluorite

Fluorite (Calcium Fluoride, CaF2)

mineral

Pumice

Pumice (volcanic rock)

Igneous

Sandstone (Pebble/Cobble)

Sandstone (arenite is a more precise term for sandstone with less than 15% matrix; this specimen appears to be a lithic or quartz arenite)

Sedimentary

Basalt

Basalt (dominated by plagioclase feldspar and pyroxene)

igneous

Conglomerate

Sedimentary

Pebble or Cobble (likely composed of sandstone or conglomerate)

Clastic Sedimentary Rock (specific name like sandstone, conglomerate, or breccia would require microscopic analysis of clast size and angularity)

Sedimentary Rock (possibly a conglomerate or coarse-grained sandstone)

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

Quartz

Quartz (SiO2 - Silicon Dioxide)

Mineral, often found as detrital grains in sedimentary rocks

Pumice (likely)

Pumice (extrusive igneous rock)

Igneous

Granite (likely a river or beach pebble)

Granite (a felsic intrusive igneous rock primarily composed of quartz, feldspar, and mica)

Igneous

Agate (or Banded Agate)

Agate (a variety of Chalcedony, which is a cryptocrystalline form of Quartz); Chemical Formula: SiO₂ (Silicon Dioxide)

Mineral, specifically a Cryptocrystalline Quartz variety

Calcite (or Alabaster, if truly carved)

Calcium Carbonate (CaCO3)

Mineral/Rock

Jade

Jadeite or Nephrite

Mineral/Mineraloid

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)

sedimentary

Crushed Stone (Basalt/Gabbro)

Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

igneous

Basalt

Basalt (Mafic volcanic rock)

igneous

Chert or Flint (polished/water-worn)

Chert (a microcrystalline or cryptocrystalline variety of quartz, SiO2). Flint is a specific variety of chert.

Sedimentary (most likely, as Chert is a sedimentary rock often found as nodules in limestone or as bedded deposits; however, it can also form by metasomatic replacement, which leans towards metamorphic processes under certain conditions)

Limonitic Gossan

Goethite/Limonite aggregate after sulfide

igneous and metamorphic derivative (weathered)

Tiger's Eye (Rough)

Macrocrystalline Quartz (SiO2 with inclusions of Crocidolite)

mineral

Barite Rose (Desert Rose)

Barium Sulfate (BaSO4)

mineral

Sodalite

Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2)

mineral

Sodalite

Na8(Al6Si6O24)Cl2 (Sodium Aluminum Silicate Chloride)

mineral

Sodalite

Sodalite (Na8Al6Si6O24Cl2)

mineral

Gold Nugget

Native Gold (Au)

mineral

Pyrite (Fool's Gold) Cube

Iron Sulfide (FeS2)

mineral

Fluorite

Calcium Fluoride (CaF2)

mineral

Black Obsidian and Hematite

Volcanic Glass (SiO2) and Hematite (Fe2O3)

igneous and mineral

Pyrite (on the right) and Magnetite or Hematite (on the left)

Iron Sulfide (FeS2) and Iron Oxide (Fe3O4 or Fe2O3)

mineral

Native Gold (in Jewelry)

Gold (Au)

mineral