Rock Identifier

Category

Igneous Or Sedimentary (Anthropogenic Modification)

Browse igneous or sedimentary (anthropogenic modification) specimens identified by the Rock Identifier community.

Mica Group Minerals (There isn't a single scientific name as 'Mica' refers to a group of phyllosilicate minerals. Common scientific names include Muscovite (KAl₂ (AlSi₃O₁₀)(OH)₂), Biotite (K(Mg,Fe)₃AlSi₃O₁₀(OH)₂), Phlogopite (KMg₃AlSi₃O₁₀(OH)₂), and Lepidolite (K(Li,Al)₃(Al,Si,Rb)₄O₁₀(F,OH)₂).) — Mineral

Mica Group Minerals

There isn't a single scientific name as 'Mica' refers to a group of phyllosilicate minerals. Common scientific names include Muscovite (KAl₂ (AlSi₃O₁₀)(OH)₂), Biotite (K(Mg,Fe)₃AlSi₃O₁₀(OH)₂), Phlogopite (KMg₃AlSi₃O₁₀(OH)₂), and Lepidolite (K(Li,Al)₃(Al,Si,Rb)₄O₁₀(F,OH)₂).

River Pebbles and Quartz (Mixed Igneous, Sedimentary, and Metamorphic Rocks (Silicon Dioxide SiO2 dominant)) — mixed

River Pebbles and Quartz

Mixed Igneous, Sedimentary, and Metamorphic Rocks (Silicon Dioxide SiO2 dominant)

Graphite (Graphite (Carbon, C)) — Mineral

Graphite

Graphite (Carbon, C)

Biotite Mica (Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)) — mineral

Biotite Mica

Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)

Orthoclase Feldspar (Orthoclase (KAlSi3O8)) — Mineral

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Apatite (Apatite Group (e.g., Fluorapatite Ca5(PO4)3F, Chlorapatite Ca5(PO4)3Cl, Hydroxylapatite Ca5(PO4)3(OH))) — mineral

Apatite

Apatite Group (e.g., Fluorapatite Ca5(PO4)3F, Chlorapatite Ca5(PO4)3Cl, Hydroxylapatite Ca5(PO4)3(OH))

Rock Crystal Quartz (Quartz (SiO₂)) — Mineral

Rock Crystal Quartz

Quartz (SiO₂)

Nephrite Jade (Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2)) — Mineral

Nephrite Jade

Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2)

Gneiss (specifically a Banded Gneiss pebble) (Gneiss (High-grade Regional Metamorphic Rock)) — metamorphic

Gneiss (specifically a Banded Gneiss pebble)

Gneiss (High-grade Regional Metamorphic Rock)

Jasper and Basalt Mix (Dark Chert/Basalt River Pebble) (Silicon Dioxide (SiO2) or Mafic extrusive igneous rock) — sedimentary or igneous

Jasper and Basalt Mix (Dark Chert/Basalt River Pebble)

Silicon Dioxide (SiO2) or Mafic extrusive igneous rock

sedimentary or igneous

River Cobble (likely Basalt or Chert) (Siliceous River Rock / Microcrystalline Quartz / Mafic Igneous) — igneous/sedimentary

River Cobble (likely Basalt or Chert)

Siliceous River Rock / Microcrystalline Quartz / Mafic Igneous

igneous/sedimentary

Crystal Quartz Beads (likely Clear Quartz) (Quartz (SiO₂)) — Mineral

Crystal Quartz Beads (likely Clear Quartz)

Quartz (SiO₂)

Fluorite in Matrix (Fluorite (CaF2) within a host rock matrix) — Mineral

Fluorite in Matrix

Fluorite (CaF2) within a host rock matrix

Fluorite (Fluorite (Calcium Fluoride, CaF2)) — mineral

Fluorite

Fluorite (Calcium Fluoride, CaF2)

Gneiss (Gneiss (Metamorphic rock of variable composition, typically SiO2 rich)) — metamorphic

Gneiss

Gneiss (Metamorphic rock of variable composition, typically SiO2 rich)

Quartz (Quartz (SiO2 - Silicon Dioxide)) — Mineral

Quartz

Quartz (SiO2 - Silicon Dioxide)

Sodalite (Sodalite - Na8(Al6Si6O24)Cl2) — mineral

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

Pebble (likely a type of sandstone or quartzite pebble) (Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.) — Sedimentary rock

Pebble (likely a type of sandstone or quartzite pebble)

Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.

Sedimentary rock

Sandstone or Siltstone (Arenite (if sandstone)) — Sedimentary

Sandstone or Siltstone

Arenite (if sandstone)

Muscovite Mica (Muscovite (Potassium Aluminum Silicate Hydroxide Fluoride), KAl2(AlSi3O10)(OH,F)2) — mineral

Muscovite Mica

Muscovite (Potassium Aluminum Silicate Hydroxide Fluoride), KAl2(AlSi3O10)(OH,F)2

Laterite (Laterite (no specific mineral formula as it's a rock type)) — Sedimentary

Laterite

Laterite (no specific mineral formula as it's a rock type)

Obsidian and Green Calcite (Volcanic Glass and Calcium Carbonate (CaCO3)) — igneous and sedimentary/mineral

Obsidian and Green Calcite

Volcanic Glass and Calcium Carbonate (CaCO3)

igneous and sedimentary/mineral

Quartz (River Pebble) (Quartz (SiO₂ - Silicon Dioxide)) — Mineral

Quartz (River Pebble)

Quartz (SiO₂ - Silicon Dioxide)

Ferrous Slag (Iron Smelting By-product) (Fused Siliceous Slag) — Anthropogenic Material (Man-made Rock)

Ferrous Slag (Iron Smelting By-product)

Fused Siliceous Slag

Anthropogenic Material (Man-made Rock)

Sea Glass (Kelly Green) (Amorphous Silica (Silicon Dioxide with Iron/Chromium additives)) — Anthropogenic specimen (Man-made material)

Sea Glass (Kelly Green)

Amorphous Silica (Silicon Dioxide with Iron/Chromium additives)

Anthropogenic specimen (Man-made material)

Sea Glass (specifically Frosted White) (Amorphous Silica (substance: Sodium-calcium silicate glass)) — Mineraloid (Anthropogenic/Man-made rock)

Sea Glass (specifically Frosted White)

Amorphous Silica (substance: Sodium-calcium silicate glass)

Mineraloid (Anthropogenic/Man-made rock)

Iron Slag (Vitreous glassy waste (Fe-Si-Al-Ca compounds)) — Mineral byproduct (anthropogenic / techno-fossil)

Iron Slag

Vitreous glassy waste (Fe-Si-Al-Ca compounds)

Mineral byproduct (anthropogenic / techno-fossil)

Sandstone (Pebble/Cobble) (Sandstone (arenite is a more precise term for sandstone with less than 15% matrix; this specimen appears to be a lithic or quartz arenite)) — Sedimentary

Sandstone (Pebble/Cobble)

Sandstone (arenite is a more precise term for sandstone with less than 15% matrix; this specimen appears to be a lithic or quartz arenite)

Green Calcite (Calcite (CaCO3)) — mineral

Green Calcite

Calcite (CaCO3)

Gneiss (Gneiss (High-grade regional metamorphic rock)) — metamorphic

Gneiss

Gneiss (High-grade regional metamorphic rock)

White Topaz (Al2SiO4(F,OH)2) — mineral

White Topaz

Al2SiO4(F,OH)2

Magnetite (Magnetite (Fe3O4)) — Mineral

Magnetite

Magnetite (Fe3O4)

Calcite (Calcite (CaCO3)) — mineral

Calcite

Calcite (CaCO3)

Quartz (Silicon Dioxide (SiO2)) — Mineral

Quartz

Silicon Dioxide (SiO2)

Granite (Granite) — igneous

Granite

Granite

Peridot and Citrine Gemstones (in a ring setting) (Peridot (Olivine: (Mg,Fe)2SiO4), Citrine (Quartz: SiO2)) — mineral

Peridot and Citrine Gemstones (in a ring setting)

Peridot (Olivine: (Mg,Fe)2SiO4), Citrine (Quartz: SiO2)

Granite (Granite (a plutonic igneous rock composed of quartz, feldspar, and mica)) — igneous

Granite

Granite (a plutonic igneous rock composed of quartz, feldspar, and mica)

Quartz (likely milky/gray variety) (Quartz (SiO₂)) — Mineral

Quartz (likely milky/gray variety)

Quartz (SiO₂)

Chalcedony (Banded/Mottled Variety) (Chalcedony (a cryptocrystalline variety of Quartz, SiO2)) — Mineral

Chalcedony (Banded/Mottled Variety)

Chalcedony (a cryptocrystalline variety of Quartz, SiO2)

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

Muscovite Mica

Muscovite (KAl₂(AlSi₃O₁₀)(F,OH)₂))

Dark-colored Igneous Rock (likely Basalt or Diabase) (Basalt (extrusive igneous) or Diabase (intrusive igneous)) — Igneous Rock

Dark-colored Igneous Rock (likely Basalt or Diabase)

Basalt (extrusive igneous) or Diabase (intrusive igneous)

Clear Quartz (Rock Crystal) (Quartz (SiO₂)) — Mineral

Clear Quartz (Rock Crystal)

Quartz (SiO₂)