Rock Identifier

Category

Mineral (Processed Alloy)

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

Dolomite on Prehnite (Saddle-shaped Dolomite) (Dolomite [CaMg(CO3)2] on Prehnite [Ca2Al(AlSi3O10)(OH)2]) — mineral

Dolomite on Prehnite (Saddle-shaped Dolomite)

Dolomite [CaMg(CO3)2] on Prehnite [Ca2Al(AlSi3O10)(OH)2]

Mixed rock and mineral gravel (Predominantly granite/granodiorite, basaltic rocks, quartz, and possible gneiss; exact identification is uncertain from the image) — igneous

Mixed rock and mineral gravel

Predominantly granite/granodiorite, basaltic rocks, quartz, and possible gneiss; exact identification is uncertain from the image

Aventurine (Silicon Dioxide (SiO2) with Fuchsite inclusions) — metamorphic

Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Petrified Wood (Silicified Wood (SiO2)) — fossil

Petrified Wood

Silicified Wood (SiO2)

Amber (Succinite (C10H16O)) — Mineraloid

Amber

Succinite (C10H16O)

Banded Agate / Lace Agate (Agate (Silica/Quartz) - SiO2) — mineral

Banded Agate / Lace Agate

Agate (Silica/Quartz) - SiO2

Greenstone (metamorphosed basalt) (Greenschist / Meta-basalt) — metamorphic

Greenstone (metamorphosed basalt)

Greenschist / Meta-basalt

Mahogany Obsidian (Obsidian (Volcanic Glass with Hematite/Magnetite inclusions), SiO2) — igneous

Mahogany Obsidian

Obsidian (Volcanic Glass with Hematite/Magnetite inclusions), SiO2

Dyed Quartz / Rose Quartz Imitation (Silicon Dioxide (SiO2) with artificial pigment) — mineral

Dyed Quartz / Rose Quartz Imitation

Silicon Dioxide (SiO2) with artificial pigment

Quartz Vein in Schist (Quartz (SiO2) in Pelitic Schist) — metamorphic

Quartz Vein in Schist

Quartz (SiO2) in Pelitic Schist

Mica Schist (Mica Schist (Intermediate-grade Metamorphic Rock)) — metamorphic

Mica Schist

Mica Schist (Intermediate-grade Metamorphic Rock)

Iron-stained quartz-rich rock, possibly quartzite or hydrothermal quartz (Quartz (SiO₂), likely with iron oxides; exact host rock uncertain from the photograph) — metamorphic

Iron-stained quartz-rich rock, possibly quartzite or hydrothermal quartz

Quartz (SiO₂), likely with iron oxides; exact host rock uncertain from the photograph

Ferruginous Sandstone (Gozzan-like) (Ferruginous Sandstone (SiO2 with FeO(OH) inclusions)) — sedimentary

Ferruginous Sandstone (Gozzan-like)

Ferruginous Sandstone (SiO2 with FeO(OH) inclusions)

Magnetite / Ironstone (Magnetite (Fe3O4)) — mineral

Magnetite / Ironstone

Magnetite (Fe3O4)

Banded Gneiss (Gneiss (Metamorphic high-grade rock)) — metamorphic

Banded Gneiss

Gneiss (Metamorphic high-grade rock)

Snowflake Obsidian (Tumbled) (Obsidian with Cristobalite inclusions) — igneous

Snowflake Obsidian (Tumbled)

Obsidian with Cristobalite inclusions

Brick (Fired clay or Ceramic material (no specific mineralogical scientific name as it's a composite)) — Man-made material (constructed)

Brick

Fired clay or Ceramic material (no specific mineralogical scientific name as it's a composite)

Man-made material (constructed)

Zirconia (Ceramic) & Ion-X Glass (Zirconium Dioxide (ZrO2) and Ion-strengthened Aluminosilicate Glass) — Synthetic Mineral / Glass

Zirconia (Ceramic) & Ion-X Glass

Zirconium Dioxide (ZrO2) and Ion-strengthened Aluminosilicate Glass

Synthetic Mineral / Glass

Serpentinite (Serpentinite (complex silicate mineral group (Mg,Fe)3Si2O5(OH)4)) — metamorphic

Serpentinite

Serpentinite (complex silicate mineral group (Mg,Fe)3Si2O5(OH)4)

Pitted Limestone with Honeycomb Weathering (Karst-weathered fossiliferous limestone (CaCO3)) — sedimentary

Pitted Limestone with Honeycomb Weathering

Karst-weathered fossiliferous limestone (CaCO3)

Quartz Druze on Matrix (Silicon Dioxide (SiO2)) — mineral

Quartz Druze on Matrix

Silicon Dioxide (SiO2)

Quartz on Host Rock (Silicon Dioxide (SiO2)) — Mineral Specimen

Quartz on Host Rock

Silicon Dioxide (SiO2)

Mineral Specimen

Gabbro (Gabbro) — igneous

Gabbro

Gabbro

Milky quartz (Quartz (silicon dioxide, SiO₂)) — mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

Quartz Vein in Granite (Crystalline Silicon Dioxide (SiO2) in Granitic Matrix) — mineral/igneous

Quartz Vein in Granite

Crystalline Silicon Dioxide (SiO2) in Granitic Matrix

mineral/igneous

Sea Glass (Frosted Quartz/Glass) (Amorphous Silicon Dioxide (SiO2)) — Mineraloid

Sea Glass (Frosted Quartz/Glass)

Amorphous Silicon Dioxide (SiO2)

Goldstone (Red) (Aventurine Glass (Cupriferous glass)) — Synthetic Glass (Man-made)

Goldstone (Red)

Aventurine Glass (Cupriferous glass)

Synthetic Glass (Man-made)

Opalite (Man-made Glass (Synthetic Opalized Glass)) — mineral

Opalite

Man-made Glass (Synthetic Opalized Glass)

Mixed polished river stones (Likely quartz, quartzite, chert/jasper, and possibly limestone or marble) — mineral

Mixed polished river stones

Likely quartz, quartzite, chert/jasper, and possibly limestone or marble

Goldstone (blue-goldstone–style glass) beads (Artificial aventurine glass, typically silica glass with copper inclusions; not a natural mineral) — mineral

Goldstone (blue-goldstone–style glass) beads

Artificial aventurine glass, typically silica glass with copper inclusions; not a natural mineral

Blue magnesite beads (Magnesite (MgCO₃), likely stabilized or dyed; brown veining may reflect matrix or iron oxides) — mineral

Blue magnesite beads

Magnesite (MgCO₃), likely stabilized or dyed; brown veining may reflect matrix or iron oxides

Silicon Carbide (Carborundum) (Silicon Carbide (SiC)) — mineral

Silicon Carbide (Carborundum)

Silicon Carbide (SiC)

Blue Dyed Agate (Cryptocrystalline Quartz (SiO2)) — mineral

Blue Dyed Agate

Cryptocrystalline Quartz (SiO2)

Milky Quartz (Quartz (Silicon Dioxide, SiO2)) — mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Blue Chalcedony (likely dyed) (Silicon Dioxide (SiO2) - Cryptocrystalline Quartz) — mineral

Blue Chalcedony (likely dyed)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Amethyst Lace Agate / Banded Amethyst (Silicon Dioxide (SiO2) with Fe3+ impurities) — mineral

Amethyst Lace Agate / Banded Amethyst

Silicon Dioxide (SiO2) with Fe3+ impurities

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Green Aventurine (Double-Terminated Wand) (Silicon Dioxide (SiO2) containing Fuchsite (Chromium-rich Muscovite Mica)) — mineral

Green Aventurine (Double-Terminated Wand)

Silicon Dioxide (SiO2) containing Fuchsite (Chromium-rich Muscovite Mica)

Blue Calcite (Calcium Carbonate (CaCO3)) — mineral

Blue Calcite

Calcium Carbonate (CaCO3)

Carnelian (Carnelian (variety of Chalcedony, SiO2)) — mineral

Carnelian

Carnelian (variety of Chalcedony, SiO2)

Yellow Quartz (Citrine/Lemon Quartz) (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz (Citrine/Lemon Quartz)

Silicon Dioxide (SiO2)

Opalite (Man-made Synthetic Glass (Silicon Dioxide with metal additives)) — mineral

Opalite

Man-made Synthetic Glass (Silicon Dioxide with metal additives)