Banded Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Category
Sedimentary And Igneous
Browse sedimentary and igneous specimens identified by the Rock Identifier community.
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Clear Quartz (beads in a bracelet)
Quartz (SiO2)
Mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
River Pebble (Basalt/Greywacke)
Weathered Basalt or Fine-Grained Greywacke
igneous/sedimentary
Granite
Granite
igneous
White Topaz
Al2SiO4(F,OH)2
mineral
Quartz (likely Milky Quartz or Chalcedony)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Quartz
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Quartz (likely a clear or rock crystal variety)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Quartz
Quartz (Silicon Dioxide - SiO2)
Mineral
Granite
Intrusive Igneous Rock
igneous
Greenstone or Epidote-rich rock
Epidote or Chlorite schist/greenstone
metamorphic
Gneiss
Gneiss
metamorphic
Green Aventurine and Clear Quartz
Aventurine (variety of Quartz - SiO2) and Quartz (SiO2)
Mineral
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Biotite Mica
Biotite, K(Mg,Fe)3AlSi3O10(F,OH)2
mineral
Quartz (vein quartz)
SiO2 (Silicon Dioxide)
Mineral
Quartz with Host Rock Matrix
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO₂)
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).
Mineral
Crushed Granite / Landscaping Gravel
Granitoid
igneous
Granite
Felsic intrusive igneous rock
igneous
Quartz (likely) or a Quartzite Pebble
Silicon dioxide (SiO2) for quartz. If it's quartzite, it's a metamorphic rock primarily composed of quartz.
Mineral, specifically a detrital grain
Milky Quartz
Quartz (SiO2)
Mineral
Black Chert
Chert (microcrystalline quartz)
Mineral
Graphite
Graphite (Carbon, C)
Mineral
Pink Opal / Peruvian Opal
Hydrated amorphous silicon dioxide (SiO2·nH2O)
Mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Pyrite
Pyrite (Iron Disulfide), FeS2
Mineral
Quartz
Silicon dioxide (SiO₂)
Mineral
Biotite Mica
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)
mineral
Quartz (likely Clear Quartz or Rock Crystal)
Quartz (SiO2)
Mineral
Dark-colored Igneous Rock (likely Basalt or Diabase)
Basalt (extrusive igneous) or Diabase (intrusive igneous)
Igneous Rock
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
River Cobble (likely Basalt or Chert)
Siliceous River Rock / Microcrystalline Quartz / Mafic Igneous
igneous/sedimentary
River Pebbles and Quartz
Mixed Igneous, Sedimentary, and Metamorphic Rocks (Silicon Dioxide SiO2 dominant)
mixed
Granite River Rock
Intrusive igneous rock (composed mainly of quartz, alkali feldspar, and plagioclase)
igneous
Granite Pebble
Phaneritic Igneous Rock
igneous
Granite Boulder
Intrusive Igneous Rock
igneous
Granite Pebble
Intrusive Igneous Rock (Quartz, Feldspar, Mica)
igneous
Granite Pebble
Intrusive Igneous Rock
igneous