Greenstone
Greenschist / Meta-basalt
metamorphic
Category
Sedimentary And Igneous (Mixed)
Browse sedimentary and igneous (mixed) specimens identified by the Rock Identifier community.
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Weathered granite pebble
Granite, mainly quartz, feldspar, and mica; approximate composition SiO₂-rich continental crust
igneous
Weathered sandstone
Quartz-rich clastic sandstone, likely iron-oxide-stained
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Vein in Host Rock
Quartz (SiO2) in Mafic or Sedimentary Matrix
igneous
Sandstone (Micaceous Sandstone)
Arenite (SiO2 with KAl2(AlSi3O10)(OH)2 inclusions)
sedimentary
Orbicular rhyolite (likely)
Rhyolite, a silica-rich volcanic rock; commonly quartz, alkali feldspar, plagioclase, and iron-rich alteration minerals
igneous
Epidote-bearing Granite (Unakite-like)
Epidotized Granite
igneous
Rounded granite or granitic gneiss cobble
Granite; primarily quartz, feldspar, and mica (exact identification requires a fresh surface and testing)
igneous
Granite (likely biotite granite)
Coarse-grained felsic plutonic rock: quartz + feldspar + biotite; approximate composition SiO₂-rich
igneous
Chinese Writing Stone
Porphyritic Basalt or Andesite with Feldspar phenocrysts (likely Orthoclase or Plagioclase)
igneous
Wonderstone
Rhyolite (Silicon Dioxide with Iron Oxide impurities)
igneous
River Pebble (Quartz-rich)
Silicon Dioxide (SiO2) with impurities
sedimentary
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Rhyolite
Rhyolite (Extrusive Igneous Rock)
igneous
Calcite
Calcite (CaCO₃)
Mineral
Banded Gneiss River Pebble
Gneiss
metamorphic
Gneiss (Metamorphic Rock Pebble)
Foliated Metamorphic Rock (Quartz-Feldspar Gneiss / Granitic Gneiss)
metamorphic
Quartz (Tumbled/Water-worn pebble)
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Gneiss (Cobble)
Gneiss
metamorphic
Gneiss
High-grade Metamorphic Gneiss
metamorphic
Gneiss (with Quartz-Feldspar vein)
Gneiss (high-grade metamorphic rock) containing Quartz (SiO2) and Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8)
metamorphic
Black Tourmaline (Schorl)
Schorl (Na(Fe^2+)3Al6(Si6O18)(BO3)3(OH)4)
Mineral
Gneiss
Metamorphic Gneiss
metamorphic
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Carnelian
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Gneiss
Gneiss
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Banded Agate (with small Geode cavity)
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Milky Quartz
Quartz (Silica / Silicon Dioxide), SiO2
mineral
Milky Quartz
Quartz (Silica / Silicon Dioxide, SiO2)
mineral
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Gneiss
Foliated Metamorphic Rock (Gneiss)
metamorphic
Smoky Quartz and Chalcedony Geode Fragment
Silicon Dioxide (SiO2)
mineral
Banded Chalcedony (Agate)
Chalcedony (SiO2) - Cryptocrystalline Quartz
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Green Fluorite
Fluorite (Calcium Fluoride - CaF2)
mineral