Rock Identifier

Category

Non Geological

Browse non geological specimens identified by the Rock Identifier community.

Obsidian (Volcanic Glass (70-75% SiO2)) — igneous

Obsidian

Volcanic Glass (70-75% SiO2)

Obsidian (Obsidian (Volcanic Glass, SiO2 + impurities)) — igneous

Obsidian

Obsidian (Volcanic Glass, SiO2 + impurities)

Amber (Succinite (a Fossilized Tree Resin); Chemical formula is approximately C10H16O) — Organic mineraloid

Amber

Succinite (a Fossilized Tree Resin); Chemical formula is approximately C10H16O

Organic mineraloid

Limestone (specifically fossiliferous/skeletal limestone) (Calcium Carbonate (CaCO3)) — sedimentary

Limestone (specifically fossiliferous/skeletal limestone)

Calcium Carbonate (CaCO3)

Anthracite Coal (Low-grade metamorphic carbonaceous rock) — metamorphic

Anthracite Coal

Low-grade metamorphic carbonaceous rock

Obsidian (Obsidian (Volcanic Glass, SiO2 + impurity)) — Igneous

Obsidian

Obsidian (Volcanic Glass, SiO2 + impurity)

Mahogany Obsidian (Volcanic Glass (SiO2 + Fe2O3)) — igneous

Mahogany Obsidian

Volcanic Glass (SiO2 + Fe2O3)

Amber (Succinite (Fossilized Resin C10H16O)) — Organic Mineraloid

Amber

Succinite (Fossilized Resin C10H16O)

Organic Mineraloid

Obsidian (Volcanic glass (high silica content based on SiO2)) — igneous

Obsidian

Volcanic glass (high silica content based on SiO2)

Obsidian (Obsidian (Volcanic Glass, SiO2 + impurity isotopes)) — igneous

Obsidian

Obsidian (Volcanic Glass, SiO2 + impurity isotopes)

Quartzite River Rock (Quartzite (primarily SiO2)) — metamorphic

Quartzite River Rock

Quartzite (primarily SiO2)

Amber (Succinite (specifically for Baltic amber); C10H16O (Variable organic compound)) — mineral

Amber

Succinite (specifically for Baltic amber); C10H16O (Variable organic compound)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Lignite (Brown Coal) (Humic Lignite (Carbonaceous sedimentary rock)) — sedimentary

Lignite (Brown Coal)

Humic Lignite (Carbonaceous sedimentary rock)

Not a geological specimen (N/A (man-made object)) — N/A

Not a geological specimen

N/A (man-made object)

Baroque Pearl (and potentially a small Sapphire/Blue Topaz) (Pearl: Calcium Carbonate (aragonite or calcite) with conchiolin. Sapphire: Aluminum Oxide (Al2O3). Blue Topaz: Al2SiO4(F,OH)2.) — Organic Gemstone (for pearl), Mineral (for sapphire/topaz)

Baroque Pearl (and potentially a small Sapphire/Blue Topaz)

Pearl: Calcium Carbonate (aragonite or calcite) with conchiolin. Sapphire: Aluminum Oxide (Al2O3). Blue Topaz: Al2SiO4(F,OH)2.

Organic Gemstone (for pearl), Mineral (for sapphire/topaz)

Muscovite Mica (Muscovite (KAl₂(AlSi₃O₁₀)(F,OH)₂))) — Mineral

Muscovite Mica

Muscovite (KAl₂(AlSi₃O₁₀)(F,OH)₂))

Anthracite Coal (Anthracite (Carbon-based metamorphic rock)) — metamorphic

Anthracite Coal

Anthracite (Carbon-based metamorphic rock)

Anthracite Coal (Anthracite (Carbon-based organic sedimentary rock transitioned to metamorphic)) — metamorphic

Anthracite Coal

Anthracite (Carbon-based organic sedimentary rock transitioned to metamorphic)

Shale (Fissile mudrock (composed of clay-sized particles and detrital grains)) — sedimentary

Shale

Fissile mudrock (composed of clay-sized particles and detrital grains)

Anthracite Coal (Anthracite) — metamorphic

Anthracite Coal

Anthracite

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Anthracite Coal (Anthracite (Carbon-rich Sedimentary-to-Metamorphic Rock)) — metamorphic

Anthracite Coal

Anthracite (Carbon-rich Sedimentary-to-Metamorphic Rock)

Apache Tear (Hydrated Obsidian (Volcanic Glass)) — Igneous

Apache Tear

Hydrated Obsidian (Volcanic Glass)

Quartzite (Quartzite (Primary mineral: SiO2)) — metamorphic

Quartzite

Quartzite (Primary mineral: SiO2)

Snowflake Obsidian (Spherulitic Obsidian (primarily SiO2)) — igneous

Snowflake Obsidian

Spherulitic Obsidian (primarily SiO2)

Quartzite with Gneissic Banding (Quartzite (primarily SiO2) with mafic mineral inclusions) — metamorphic

Quartzite with Gneissic Banding

Quartzite (primarily SiO2) with mafic mineral inclusions

Quartzite (Pink/Red variety) (Quartzite (SiO2 with iron oxide impurities)) — metamorphic

Quartzite (Pink/Red variety)

Quartzite (SiO2 with iron oxide impurities)

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

Obsidian

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

Chert (Iron-stained) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Iron-stained)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Conglomerate (Conglomerate (clastic sedimentary rock)) — sedimentary

Conglomerate

Conglomerate (clastic sedimentary rock)

Blue Opal Inlay (Simulated/Lab-created) (Hydrated Amorphous Silica (SiO2·nH2O) with polymer resin) — mineraloid

Blue Opal Inlay (Simulated/Lab-created)

Hydrated Amorphous Silica (SiO2·nH2O) with polymer resin

Quartzite Pebble (River Rock) (Quartzite (mainly SiO2)) — metamorphic

Quartzite Pebble (River Rock)

Quartzite (mainly SiO2)

Snowflake Obsidian (Volcanic Glass with Cristobalite inclusions) — igneous

Snowflake Obsidian

Volcanic Glass with Cristobalite inclusions

Quartzite (Quartzite (Primary mineral: Silicon Dioxide, SiO2)) — metamorphic

Quartzite

Quartzite (Primary mineral: Silicon Dioxide, SiO2)

Amber (Succinite (Formula: C10H16O)) — mineral

Amber

Succinite (Formula: C10H16O)

Amber (Amber (Amorphous Organic Hydrocarbon)) — mineral

Amber

Amber (Amorphous Organic Hydrocarbon)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Apache Tear (Obsidian (Hydrated Volcanic Glass)) — igneous

Apache Tear

Obsidian (Hydrated Volcanic Glass)

Citrine (Heat-treated Amethyst) (Citrine Quartz (SiO2)) — Mineral (Tectosilicate)

Citrine (Heat-treated Amethyst)

Citrine Quartz (SiO2)

Mineral (Tectosilicate)

Obsidian (Volcanic Glass (Amorphous Silica)) — igneous

Obsidian

Volcanic Glass (Amorphous Silica)

Unakite (Epidotized Granite) — metamorphic

Unakite

Epidotized Granite