Biotite Schist (likely)
Biotite Schist (rock), Biotite (mineral)
Metamorphic
Category
Sedimentary And Igneous (Mixed)
Browse sedimentary and igneous (mixed) specimens identified by the Rock Identifier community.
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Banded Gneiss (River Cobble)
Gneiss (a high-grade metamorphic rock)
metamorphic
Pebble (likely Sandstone or Granitic Pebble)
Clastic Sediment (or specific rock type, e.g., Arenite, Granitoid Pebble)
Rock (likely Sedimentary)
Quartz
Silicon Dioxide (SiO₂)
Mineral
Quartz
Silicon Dioxide (SiO2)
Mineral
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral, often found as detrital grains in sedimentary rocks
Quartz (likely macrocrystalline variety)
Quartz (SiO₂)
Mineral
Pumice
Pumice (volcanic rock)
Igneous
Nephrite Jade
Nephrite (a variety of the mineral actinolite within the amphibole group); Chemical Formula: Ca2(Mg,Fe)5Si8O22(OH)2
Mineral
Quartzite
Quartzite (primarily SiO₂)
metamorphic
Epidote in Quartz
Quartz with Epidote inclusions (SiO2 with Ca2(Al,Fe)3(SiO4)3(OH) inclusions)
Mineral
Apatite
Apatite group mineral (e.g., Fluorapatite - Ca5(PO4)3F, Chlorapatite - Ca5(PO4)3Cl, Hydroxylapatite - Ca5(PO4)3(OH))
mineral
Quartz Geode/Cluster
Quartz (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Mineral / Sedimentary occurrence
Sapphire (Corundum)
Corundum (Al2O3), variety Sapphire
Mineral
Quartz (likely milky quartz or a stained variety)
Silicon Dioxide (SiO₂)
Mineral
Quartz Vein in Host Rock (Breccia/Rhyolite)
Silicon Dioxide (SiO2) with matrix
Mineral in Igneous/Sedimentary host
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
River Pebbles (Sandstone and Quartzite)
SiO2 (Quartz) dominated clastic rocks
sedimentary and metamorphic
Sandstone, Quartzite, and River Pebbles
Silicon Dioxide (SiO2) based Sedimentary/Metamorphic structures
Sedimentary and Metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
Mineral / Sedimentary component
Quartz
Quartz (SiO₂)
Mineral
Pyrite-bearing rock (likely pyrite in a quartz or sulfide-rich matrix)
Pyrite, FeS₂; the gray host may be quartz, carbonate, or another sulfide-bearing rock
mineral
Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Schist
N/A (a rock type, not a mineral formula)
metamorphic
Banded Chert / Banded Jasper (likely a variety of Chert/Chalcedony)
Chert (microcrystalline quartz)
Metamorphic Rock
Granite
Granite (a plutonic igneous rock composed of quartz, feldspar, and mica)
igneous
Hematite
Hematite (Fe2O3)
Mineral
Quartzite / Sandstone / Chert Mix
Silicon Dioxide (SiO2)
sedimentary and metamorphic
Quartz
Silicon Dioxide (SiO2)
Mineral
Citrine
Quartz (SiO₂)
mineral
Marble
Metamorphosed Limestone/Dolomite
metamorphic
Limonite (Iron Ore/Hydrated Iron Oxide)
Limonite (mixture of FeO(OH)·nH₂O minerals, mainly Goethite, FeO(OH) and Lepidocrocite, FeO(OH))
Mineral
Quartz (likely a macrocrystalline variety like milky quartz or smoky quartz, given the appearance in the image)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Jasper in Basalt Matrix
Silicon Dioxide (SiO2) with impurities; Chalcedony
sedimentary (secondary mineral) within igneous
Banded Gneiss
Gneiss (variable mineral composition)
metamorphic
Chalcopyrite
Chalcopyrite (CuFeS2)
Mineral
Quartz (Rock Crystal) with minor impurities
Quartz (SiO2)
Mineral
Blue Quartz
Quartz (SiO2) with inclusions
Mineral
Orthoclase Feldspar (or K-Feldspar)
Orthoclase (KAlSi3O8)
Mineral
Quartz Pebble (Iron-stained)
Silicon Dioxide (SiO2)
Mineral / Sedimentary setting
Quartz Geode
Silicon Dioxide (SiO2) in a Geode body
sedimentary or igneous (host environment)