Amber
Succinite (fossilized tree resin)
mineraloid / sedimentary organic material
Category
Man Made Material (Simulated Mineral)
Browse man made material (simulated mineral) specimens identified by the Rock Identifier community.
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
Quartzite
Quartzite
Metamorphic rock
Basalt
Basalt (dominated by plagioclase feldspar and pyroxene)
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)
Pumice
Pumice (volcanic rock)
Igneous
Quartz (chalcedony variety) or Limestone with Quartz Veins
SiO2 (for Quartz/Chalcedony); CaCO3 (for Limestone)
Mineral or Sedimentary Rock (with mineral inclusions)
Banded Jasper (Chert)
Silicon Dioxide (SiO2) - variety of Chalcedony
Sedimentary Rock
Red Tiger's Eye beads
Tiger's Eye (variety of Chalcedony, SiO2)
Mineral / Gemstone (variety of Quartz)
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral, often found as detrital grains in sedimentary rocks
Shale (possibly)
Shale (fine-grained clastic sedimentary rock)
sedimentary
Amber (Black)
Amber (succinite, retinite, etc., specifically, heavily included/dark varieties)
Mineraloid
Red Coral
Corallium rubrum (for precious red coral), although other species like Corallium japonicum and Paracorallium are also used.
Organic Gemstone (not a rock or mineral in the traditional sense, but bio-mineralized material)
Sodalite
Sodalite - Na8(Al6Si6O24)Cl2
Mineral
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
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Granodiorite (River Pebble)
Granodiorite
igneous
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Chalk-associated Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Ocean Jasper
Silicon Dioxide (SiO2)
Mineral_variety_of_Chalcedony
Calcite (or Alabaster, if truly carved)
Calcium Carbonate (CaCO3)
Mineral/Rock
Quartzite
Metamorphic Rock (Mainly SiO2)
metamorphic
Diabase (Greenstone)
Diabase (Dolerite)
igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Chert Nodule (with Flint core)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Pearl (Imitation or Cultured)
Calcium Carbonate (Aragonite/Calcite) - CaCO3
Mineraloid (Organic)
Scoria
Vesicular Basaltic Glass
igneous
Calcite (commonly referred to as Orange Calcite or Honey Calcite given its color)
Calcite
Mineral
Limestone
Calcium carbonate (CaCO3)
sedimentary
Chert (often called Flint)
Chert (Cryptocrystalline Silica, SiO2)
sedimentary
Granite
Granite (Phaneritic Quartz-Feldspar Felsic Rock)
igneous
Granite Cobble
Phaneritic Felsic Igneous Rock (Granite)
igneous
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Quartz (White/Milky Pebble)
Silicon Dioxide (SiO2)
mineral
Jasper (Red/Yellow)
Silicon Dioxide (SiO2) with impurities
sedimentary
Quartzite Pebble
Metamorphic Quartz (SiO2)
metamorphic
Crushed Limestone
Calcium Carbonate (CaCO3)
sedimentary
Goethite
Goethite (α-FeO(OH))
Mineral
Chert (variations include Flint or Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Granite
Granite (composed primarily of Quartz SiO2, Alkali Feldspar KAlSi3O8, and Plagioclase)
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary