Rock Identifier

Category

Mineral (Specifically A Mineraloid)

Browse mineral (specifically a mineraloid) specimens identified by the Rock Identifier community.

Learn about Mineral (Specifically A Mineraloid) in the encyclopedia

Shungite

Anatase

Sperrylite

Hutcheonite

Celsian

Coal

Olenite

Buergerite

Glauconite

Rock Salt

Baddeleyite

Brookite

Flint (Sedimentary cryptocrystalline quartz (SiO2)) — sedimentary

Flint

Sedimentary cryptocrystalline quartz (SiO2)

Opal (Precious Opal) (Hydrated Silica (SiO2·nH2O)) — mineral

Opal (Precious Opal)

Hydrated Silica (SiO2·nH2O)

Amber (Copal) (Succinate (Fossilized Tree Resin)) — mineraloid

Amber (Copal)

Succinate (Fossilized Tree Resin)

Cullet Glass (Man-made Glass Slag) (Amorphous Silica (SiO2) with chemical additives) — Mineraloid

Cullet Glass (Man-made Glass Slag)

Amorphous Silica (SiO2) with chemical additives

Black Opal (Triplet) (Hydrated Silica (SiO2·nH2O)) — mineral

Black Opal (Triplet)

Hydrated Silica (SiO2·nH2O)

Fuchsite (Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)) — mineral

Fuchsite

Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)

Pearl (Biogenic Mineraloid) (Calcium carbonate (Aragonite) and Conchiolin, CaCO3) — mineral

Pearl (Biogenic Mineraloid)

Calcium carbonate (Aragonite) and Conchiolin, CaCO3

Amber (Succinite (a specific common type) or Fossilized Tree Resin (C10H16O)) — Mineraloid

Amber

Succinite (a specific common type) or Fossilized Tree Resin (C10H16O)

Pearl (Biogenic Mineraloid) (Calcium carbonate (CaCO3) primarily as Aragonite) — mineral

Pearl (Biogenic Mineraloid)

Calcium carbonate (CaCO3) primarily as Aragonite

Obsidian (Obsidian (Volcanic Glass)) — igneous

Obsidian

Obsidian (Volcanic Glass)

Obsidian (Black Obsidian) (Obsidian (Volcanic Glass)) — igneous

Obsidian (Black Obsidian)

Obsidian (Volcanic Glass)

White Opal (Common) (Hydrated Silica (SiO2·nH2O)) — mineral

White Opal (Common)

Hydrated Silica (SiO2·nH2O)

Common Opal (Potch) (Hydrated Silica (SiO2·nH2O)) — mineral

Common Opal (Potch)

Hydrated Silica (SiO2·nH2O)

Man-made Jewelry (Metal and Glass/Plastic) (Synthetic Alloy and Amorphous Solid (SiO2/Polymer)) — not a rock

Man-made Jewelry (Metal and Glass/Plastic)

Synthetic Alloy and Amorphous Solid (SiO2/Polymer)

Snowflake Obsidian (Volcanic Glass (spherulitic Obsidian) - SiO2 (with Cristobalite inclusions)) — igneous

Snowflake Obsidian

Volcanic Glass (spherulitic Obsidian) - SiO2 (with Cristobalite inclusions)

Yellow-orange amber (Fossilized tree resin; amber is an organic mineraloid, not a true mineral) — fossil

Yellow-orange amber

Fossilized tree resin; amber is an organic mineraloid, not a true mineral

Amber (polished piece) (Fossilized tree resin; amber is an organic mineraloid, not a true mineral) — gemstone

Amber (polished piece)

Fossilized tree resin; amber is an organic mineraloid, not a true mineral

Yellow amber beads (Amber (fossilized tree resin; organic mineraloid, not a true mineral)) — gemstone

Yellow amber beads

Amber (fossilized tree resin; organic mineraloid, not a true mineral)

Sandstone (Ferruginous) (Arenite (with Iron Oxide cement)) — sedimentary

Sandstone (Ferruginous)

Arenite (with Iron Oxide cement)

Moonstone (Feldspar) (Orthoclase (KAlSi3O8) or Albite (NaAlSi3O8)) — mineral

Moonstone (Feldspar)

Orthoclase (KAlSi3O8) or Albite (NaAlSi3O8)

Black Pearl (Tahitian Pearl) (Aragonite / Calcite (CaCO3) with Conchiolin) — mineral

Black Pearl (Tahitian Pearl)

Aragonite / Calcite (CaCO3) with Conchiolin

Obsidian (Volcanic glass (silica-rich rhyolitic melt; primarily SiO₂)) — igneous

Obsidian

Volcanic glass (silica-rich rhyolitic melt; primarily SiO₂)

Obsidian (Volcanic Glass (comprised primarily of SiO2)) — Igneous

Obsidian

Volcanic Glass (comprised primarily of SiO2)

Black Obsidian (Volcanic Glass (predominantly SiO2, Silicon Dioxide)) — igneous

Black Obsidian

Volcanic Glass (predominantly SiO2, Silicon Dioxide)

Rhodonite (Inosilicate, (Mn,Fe,Mg,Ca)SiO3) — mineral

Rhodonite

Inosilicate, (Mn,Fe,Mg,Ca)SiO3

Bornite (Bornite (Cu5FeS4)) — mineral

Bornite

Bornite (Cu5FeS4)

Selenite Gypsum (Hydrous calcium sulfate (CaSO4·2H2O)) — mineral

Selenite Gypsum

Hydrous calcium sulfate (CaSO4·2H2O)

Limonite (Iron Ore) (Limonite (an FeO(OH)·nH2O mineraloid, not a true mineral due to variable composition)) — Mineral

Limonite (Iron Ore)

Limonite (an FeO(OH)·nH2O mineraloid, not a true mineral due to variable composition)

Amber (Copal) (Succinate (Fossilized Resin)) — mineraloid

Amber (Copal)

Succinate (Fossilized Resin)

Amber / Copal (Succinite (fossilized tree resin)) — mineraloid

Amber / Copal

Succinite (fossilized tree resin)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Citrine or Yellow Quartz (Quartz (SiO2) with iron impurities) — mineral

Citrine or Yellow Quartz

Quartz (SiO2) with iron impurities

Green Aventurine (Quartz (SiO2) with fuchsite inclusions) — mineral

Green Aventurine

Quartz (SiO2) with fuchsite inclusions

Natural White Pearl (Calcium Carbonate (Aragonite/Calcite) with Conchiolin - CaCO3) — mineraloid

Natural White Pearl

Calcium Carbonate (Aragonite/Calcite) with Conchiolin - CaCO3

Moqui Marble (Concretion) (Iron Oxide Concretion) — sedimentary

Moqui Marble (Concretion)

Iron Oxide Concretion

Blue Topaz (Aluminum Silicate Fluoride Hydroxide - Al2SiO4(F,OH)2) — gemstone

Blue Topaz

Aluminum Silicate Fluoride Hydroxide - Al2SiO4(F,OH)2

Cullet Glass (Slag) (Amorphous Silicon Dioxide (Man-made)) — Mineraloid

Cullet Glass (Slag)

Amorphous Silicon Dioxide (Man-made)

Obsidian (Volcanic glass (Amorphous silicon dioxide)) — igneous

Obsidian

Volcanic glass (Amorphous silicon dioxide)

Obsidian (Volcanic glass) — igneous

Obsidian

Volcanic glass

Mahogany Obsidian (Volcanic Glass (SiO2 with Fe/Mg oxides)) — igneous

Mahogany Obsidian

Volcanic Glass (SiO2 with Fe/Mg oxides)

Black Obsidian (Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)) — igneous

Black Obsidian

Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)