Rock Identifier

Category

Mineral Based Composite

Browse mineral based composite specimens identified by the Rock Identifier community.

Learn about Mineral Based Composite in the encyclopedia

Pyroxenite

Mystic Topaz (Treated Quartz or Topaz) (Aluminum silicate fluoride hydroxide [Al2SiO4(F,OH)2] with thin-film metallic coating) — gemstone

Mystic Topaz (Treated Quartz or Topaz)

Aluminum silicate fluoride hydroxide [Al2SiO4(F,OH)2] with thin-film metallic coating

Granite (Granite (a plutonic igneous rock)) — Igneous

Granite

Granite (a plutonic igneous rock)

Sapphire (Corundum (Al2O3)) — mineral

Sapphire

Corundum (Al2O3)

Botryoidal quartz geode (Quartz (SiO₂), likely a chalcedony-lined geode with drusy quartz crystals) — mineral

Botryoidal quartz geode

Quartz (SiO₂), likely a chalcedony-lined geode with drusy quartz crystals

K2 Stone (or K2 Jasper) (Azurite-in-Granite (Potassium Feldspar, Quartz, Plagioclase, Muscovite, and Azurite)) — igneous

K2 Stone (or K2 Jasper)

Azurite-in-Granite (Potassium Feldspar, Quartz, Plagioclase, Muscovite, and Azurite)

Fossilized Shark Tooth (Chondrichthyes (Class)) — fossil

Fossilized Shark Tooth

Chondrichthyes (Class)

Dalmatian Stone (Dalmatian Jasper (a misnomer for an Aplite with Arfvedsonite spots)) — igneous

Dalmatian Stone

Dalmatian Jasper (a misnomer for an Aplite with Arfvedsonite spots)

Granite (Granite (a broadly defined plutonic igneous rock, often more specifically classified as quartz monzonite or granodiorite based on precise mineral percentages)) — igneous

Granite

Granite (a broadly defined plutonic igneous rock, often more specifically classified as quartz monzonite or granodiorite based on precise mineral percentages)

Gold Nugget (Native Gold (Au)) — mineral

Gold Nugget

Native Gold (Au)

Green Mica (Fuchsinite or Muscovite, KAl2(AlSi3O10)(OH)2) — mineral

Green Mica

Fuchsinite or Muscovite, KAl2(AlSi3O10)(OH)2

Topaz (Al2SiO4(F,OH)2) — mineral

Topaz

Al2SiO4(F,OH)2

Septarian Nodule (Septarian Concretion (CaCO3 with Siderite/Limonite streaks)) — sedimentary

Septarian Nodule

Septarian Concretion (CaCO3 with Siderite/Limonite streaks)

Shungite (Non-crystalline carbon (allotrope of carbon)) — metamorphic

Shungite

Non-crystalline carbon (allotrope of carbon)

Mica (Muscovite or Biotite) (Sheet silicate mineral group (e.g., KAl2(AlSi3O10)(F,OH)2)) — mineral

Mica (Muscovite or Biotite)

Sheet silicate mineral group (e.g., KAl2(AlSi3O10)(F,OH)2)

Carved Mottled Greenish-Yellow Crystal/Glass Object (Unknown; possibly a form of quartz (chalcedony/jadeite/nephrite) or glass/resin.) — Man-made Object/Uncertain Mineral

Carved Mottled Greenish-Yellow Crystal/Glass Object

Unknown; possibly a form of quartz (chalcedony/jadeite/nephrite) or glass/resin.

Man-made Object/Uncertain Mineral

Fossilized Shark Tooth (Selachimorpha fossil) — fossil

Fossilized Shark Tooth

Selachimorpha fossil

Epidote (Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)) — mineral

Epidote

Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)

Raw Sapphire / Corundum (Corundum (Al2O3 - Aluminium oxide)) — mineral

Raw Sapphire / Corundum

Corundum (Al2O3 - Aluminium oxide)

Yellow Topaz (Aluminum silicate fluoride hydroxide, Al2SiO4(F,OH)2) — gemstone

Yellow Topaz

Aluminum silicate fluoride hydroxide, Al2SiO4(F,OH)2

Asphalt Chunk (Asphalt concrete) — man-made composite

Asphalt Chunk

Asphalt concrete

man-made composite

Polished banded calcite (often sold as “onyx marble” or Mexican onyx) (Banded calcite; predominantly CaCO₃, usually microcrystalline to fibrous calcite) — sedimentary

Polished banded calcite (often sold as “onyx marble” or Mexican onyx)

Banded calcite; predominantly CaCO₃, usually microcrystalline to fibrous calcite

Fossilized Shark Tooth (Elasmobranchii (various species, possibly Carcharias or Odontaspis)) — fossil

Fossilized Shark Tooth

Elasmobranchii (various species, possibly Carcharias or Odontaspis)

Basalt with Xenolith (Extrusive Igneous Rock containing Mantle Xenolith) — igneous

Basalt with Xenolith

Extrusive Igneous Rock containing Mantle Xenolith

Polished turquoise cabochon jewelry (likely composite or stabilized turquoise) (Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O) — mineral

Polished turquoise cabochon jewelry (likely composite or stabilized turquoise)

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O

Green Aura Quartz (Titanium treated Kyanite or Quartz) (Silicon Dioxide (SiO2) or Aluminum Silicate (Al2SiO5) with Titanium/Metal Oxide coating) — mineral (man-made aura treatment)

Green Aura Quartz (Titanium treated Kyanite or Quartz)

Silicon Dioxide (SiO2) or Aluminum Silicate (Al2SiO5) with Titanium/Metal Oxide coating

mineral (man-made aura treatment)

Schist (Oxidized) (Mica Schist with Iron Oxide staining) — metamorphic

Schist (Oxidized)

Mica Schist with Iron Oxide staining

Porphyritic Basalt (Porphyritic Extrusive Igneous Rock) — igneous

Porphyritic Basalt

Porphyritic Extrusive Igneous Rock

Aura Quartz (Anomalously Coated Quartz) (Silicon Dioxide (SiO2) treated with vaporized metals) — mineral

Aura Quartz (Anomalously Coated Quartz)

Silicon Dioxide (SiO2) treated with vaporized metals

Conglomerate (Clastic Sedimentary Conglomerate (SiO2 primarily)) — sedimentary

Conglomerate

Clastic Sedimentary Conglomerate (SiO2 primarily)

Basalt with Amygdaloidal Infilling (Porphyritic or Amygdaloidal Basalt) — igneous

Basalt with Amygdaloidal Infilling

Porphyritic or Amygdaloidal Basalt

Basalt Porphyry (Porphyritic Basalt) — igneous

Basalt Porphyry

Porphyritic Basalt

Epidote on Matrix (Epidote (Ca2(Al, Fe)3(SiO4)3(OH))) — mineral

Epidote on Matrix

Epidote (Ca2(Al, Fe)3(SiO4)3(OH))

Quartz (Iron-Stained or Milky) (Silicon Dioxide (SiO2)) — mineral

Quartz (Iron-Stained or Milky)

Silicon Dioxide (SiO2)

Polished labradorite cabochon (Labradorite, a plagioclase feldspar: (Ca,Na)(Al,Si)₄O₈) — mineral

Polished labradorite cabochon

Labradorite, a plagioclase feldspar: (Ca,Na)(Al,Si)₄O₈

Blue Chalcedony and Picture Jasper Beads (Blue Chalcedony (SiO2), Picture Jasper (SiO2)) — Mineral

Blue Chalcedony and Picture Jasper Beads

Blue Chalcedony (SiO2), Picture Jasper (SiO2)

Schist (Mica Schist (Metamorphic rock)) — metamorphic

Schist

Mica Schist (Metamorphic rock)

Amethyst or Smoky Quartz Geode Slice (Crystalline Silicon Dioxide (SiO2) with iron impurities) — mineral

Amethyst or Smoky Quartz Geode Slice

Crystalline Silicon Dioxide (SiO2) with iron impurities

Chalcedony or Chert/Jasper with secondary mineral staining (SiO2 (for chalcedony/quartz) with possible secondary copper minerals (e.g., CuSiO3·nH2O for chrysocolla, Cu2(CO3)(OH)2 for malachite) or iron oxides/hydroxides.) — Mineral, potentially a rock with chalcedony/jasper.

Chalcedony or Chert/Jasper with secondary mineral staining

SiO2 (for chalcedony/quartz) with possible secondary copper minerals (e.g., CuSiO3·nH2O for chrysocolla, Cu2(CO3)(OH)2 for malachite) or iron oxides/hydroxides.

Mineral, potentially a rock with chalcedony/jasper.

Polished brown gemstone, likely smoky quartz (Smoky quartz (quartz, SiO₂), possibly brown chalcedony or tiger’s-eye based on the photograph) — gemstone

Polished brown gemstone, likely smoky quartz

Smoky quartz (quartz, SiO₂), possibly brown chalcedony or tiger’s-eye based on the photograph

Porphyritic Basalt (Extrusive igneous rock with plagioclase phenocrysts) — igneous

Porphyritic Basalt

Extrusive igneous rock with plagioclase phenocrysts

Mica Schist (Mica Schist (primarily Muscovite or Biotite sheet silicates)) — metamorphic

Mica Schist

Mica Schist (primarily Muscovite or Biotite sheet silicates)

Porphyritic Basalt (Basalt (porphyritic texture)) — igneous

Porphyritic Basalt

Basalt (porphyritic texture)