Mixed: Igneous And Sedimentary

Browse mixed: igneous and sedimentary specimens identified by the Rock Identifier community.

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

Sandstone (Quartzose Sandstone)

Clastic sedimentary rock (SiO2 primary composition)

sedimentary

Banded Chert or Agate

Silicon Dioxide (SiO2)

sedimentary

Shale (or Mudstone)

Siltstone/Argillite (composed mainly of clay and silt-sized particles)

sedimentary

Chert (also known as Flint or Common Chalcedony)

Cryptocrystalline Silica (SiO2)

sedimentary

Banded Sandstone

Arenite with Liesegang banding (primarily SiO2 with FeO(OH) impurities)

sedimentary

Sandstone

Arenite (primarily SiO2)

sedimentary

Quartz (vein quartz)

SiO2 (Silicon Dioxide)

Mineral

Galena

Lead Sulfide (PbS)

mineral

Yellow Jasper

Silicon Dioxide (SiO2) with iron inclusions

sedimentary

Quartz (River Pebble)

Quartz (Silicon Dioxide - SiO2)

mineral

Quartz Pebble

Silicon Dioxide (SiO2)

mineral

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

mineral

Quartz (River Pebble)

Silicon Dioxide (SiO2)

mineral

Milky Quartz

Crystalline Silicon Dioxide (SiO2)

mineral

Peach Moonstone

Orthoclase Feldspar (KAlSi3O8)

mineral

River Pebble (Basalt/Greywacke)

Weathered Basalt or Fine-Grained Greywacke

igneous/sedimentary

Pyrite

Pyrite (Iron Disulfide), FeS2

Mineral

Quartz

Silicon dioxide (SiO₂)

Mineral

Yellow Quartz

Silicon Dioxide (SiO2)

mineral

Quartz (Water-worn pebble)

Silicon Dioxide (SiO2)

mineral

Smoky Quartz

Silicon Dioxide (SiO2)

mineral

Milky Quartz

Quartz (SiO2)

mineral

Amethyst

Amethyst (Silicon Dioxide, SiO2 with Iron impurities)

mineral

Citrine

Silicon Dioxide (SiO2) - Yellow Quartz variety

mineral

Quartz Pebble (Sea Glass-like Quartz)

Quartz (Silicon Dioxide - SiO2)

mineral

Pebble (Likely Basalt or Siltstone)

Clastic sedimentary rock or mafic volcanic rock

Igneous or Sedimentary

Milky Quartz (with trace inclusions)

Silicon Dioxide (SiO2)

mineral

Chert (Jasper variety)

Silicon Dioxide (SiO2)

sedimentary

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)

Mineral

Carnelian

Carnelian (variety of Chalcedony, 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