Mixed (Predominantly Sedimentary And Igneous)

Browse mixed (predominantly sedimentary and igneous) specimens identified by the Rock Identifier community.

Gneiss with Quartz Veining

Gneiss (High-grade regional metamorphic rock)

metamorphic

Gneiss (Banded Gneiss)

Gneiss

metamorphic

Pyrite

Iron Sulfide (FeS2)

mineral

Biotite (Black Mica)

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

mineral

Banded Agate (Jasper-Agate)

Silicon Dioxide (SiO₂)

Mineral

Hematite

Iron(III) oxide (Fe2O3)

mineral

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

mineral

Magnetite (Lodestone variety)

Magnetite (Iron(II,III) oxide, Fe3O4)

mineral

Quartz (Milky/Common variant)

Silicon Dioxide (SiO2)

mineral

Gneiss

Gneiss (High-grade metamorphic rock)

metamorphic

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

mineral

Schist (specifically Chlorite/Greenschist)

Chlorite Schist

metamorphic

Clear Quartz

Silicon Dioxide (SiO2)

mineral

Epidote with Magnetite/Hematite inclusions

Epidote (Ca2(Al2,Fe3+)(SiO4)3(OH)) with Iron Oxides

mineral

Clear Quartz

Silicon Dioxide (SiO2)

mineral

Milky Quartz

Silicon Dioxide (SiO2)

mineral

Pyrite on Quartz

Iron Sulfide (FeS2) on Silicon Dioxide (SiO2)

mineral

Milky Quartz

Silicon Dioxide (SiO2)

mineral

Carnelian Agate

Chalcedony (SiO2) with iron oxide inclusions

mineral

Agate Geode

Chalcedony (cryptocrystalline SiO2)

mineral

Blue Calcite

Calcium Carbonate (CaCO3)

mineral

Magnetite / Ironstone

Magnetite (Fe3O4)

mineral

Basalt River Stone

Basalt (Aphanitic Mafic Igneous Rock)

igneous

Porphyritic Basalt (Chinese Flower Stone / Chrysanthemum Stone basalt variety)

Porphyritic Basalt containing Plagioclase Feldspar phenocrysts

igneous

Quartz with Iron Stains

Quartz (SiO2) with iron oxide/hydroxide staining

Mineral

Bloodstone Jasper (Heliotrope)

SiO2 (Silicon Dioxide) - Cryptocrystalline Quartz

sedimentary

Quartz

Quartz (SiO₂)

Mineral

Weathered Volcanic Rock (possibly Rhyolite or Andesite Pebble)

Volcanic rock (e.g., Rhyolite or Andesite, specific identification would require thin section analysis or chemical assay). Mineral composition: Primarily feldspars (orthoclase and/or plagioclase), quartz (in rhyolite), micas, amphiboles, and sometimes pyroxenes.

Igneous, specifically volcanic/extrusive (possibly Rhyolite or Andesite)