Biotite Schist (likely)
Biotite Schist (rock), Biotite (mineral)
Metamorphic
Category
Sedimentary Or Igneous Fragment
Browse sedimentary or igneous fragment specimens identified by the Rock Identifier community.
Banded Gneiss (River Cobble)
Gneiss (a high-grade metamorphic rock)
metamorphic
Quartz (likely macrocrystalline variety)
Quartz (SiO₂)
Mineral
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral, often found as detrital grains in sedimentary rocks
Quartz Geode/Cluster
Quartz (SiO2)
mineral
Nephrite Jade
Nephrite (a variety of the mineral actinolite within the amphibole group); Chemical Formula: Ca2(Mg,Fe)5Si8O22(OH)2
Mineral
Banded Metamorphic Rock (likely Quartzite or Serpentinite/Soapstone)
Metamorphic Rock (possibly a banded Quartzite or a foliated Serpentinite/Talc Schist based on appearance, general term for such a rock is 'Banded Metamorphic Rock' or 'Gneiss' if pronounced banding of different minerals)
Metamorphic
Quartzite
Quartzite (primarily SiO₂)
metamorphic
Epidote in Quartz
Quartz with Epidote inclusions (SiO2 with Ca2(Al,Fe)3(SiO4)3(OH) inclusions)
Mineral
Black Tourmaline
Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)
Mineral
Apatite
Apatite group mineral (e.g., Fluorapatite - Ca5(PO4)3F, Chlorapatite - Ca5(PO4)3Cl, Hydroxylapatite - Ca5(PO4)3(OH))
mineral
Quartz (likely milky quartz or a stained variety)
Silicon Dioxide (SiO₂)
Mineral
Jasper (specifically Polychrome or Desert Jasper)
Silicon Dioxide (SiO2) with impurities
sedimentary or igneous-associated mineral
Quartz
Quartz (SiO₂)
Mineral
Pumice
Pumice (volcanic rock)
Igneous
Quartz Vein in Host Rock (Breccia/Rhyolite)
Silicon Dioxide (SiO2) with matrix
Mineral in Igneous/Sedimentary host
Quartz Geode
Silicon Dioxide (SiO2) in a Geode body
sedimentary or igneous (host environment)
Quartz Pebble
Silicon Dioxide (SiO2)
Mineral / Sedimentary occurrence
Hematite
Hematite (Fe2O3)
Mineral
Sapphire (Corundum variety)
Sapphire (Al₂O₃)
Mineral
Rutilated Quartz
SiO2 with TiO2 inclusions (Rutile)
Mineral
Quartz
Silicon Dioxide (SiO2)
Mineral
Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Schist
N/A (a rock type, not a mineral formula)
metamorphic
Geode with Quartz and possibly Jasper/Hematite
Quartz (SiO2) and Chalcedony (cryptocrystalline SiO2), possibly stained by iron oxides
Mineral/Sedimentary Geode
Quartz Pebble
Silicon Dioxide (SiO2)
Mineral / Sedimentary component
Quartz (chalcedony variety) or Limestone with Quartz Veins
SiO2 (for Quartz/Chalcedony); CaCO3 (for Limestone)
Mineral or Sedimentary Rock (with mineral inclusions)
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
Granite
Granite (a plutonic igneous rock composed of quartz, feldspar, and mica)
igneous
Orthoclase Feldspar (or K-Feldspar)
Orthoclase (KAlSi3O8)
Mineral
Banded Gneiss
Gneiss (variable mineral composition)
metamorphic
Quartz (Rock Crystal) with minor impurities
Quartz (SiO2)
Mineral
Chalcopyrite
Chalcopyrite (CuFeS2)
Mineral
Blue Quartz
Quartz (SiO2) with inclusions
Mineral
Jasper in Basalt Matrix
Silicon Dioxide (SiO2) with impurities; Chalcedony
sedimentary (secondary mineral) within igneous
Quartz (on matrix)
Quartz (Silicon Dioxide, SiO₂)
Mineral
Leopardskin Jasper
Jasper (a variety of microcrystalline Quartz)
Sedimentary
Quartz Pebble (Iron-stained)
Silicon Dioxide (SiO2)
Mineral / Sedimentary setting
Schist
Schist (various mineralogical compositions including mica, chlorite, talc, etc.)
Metamorphic
Pyrite
Iron Pyrite (FeS2)
mineral