Chert / Flint
Chert (varieties include Flint)
Sedimentary
Category
Man Made Metamorphic Style Composite
Browse man made metamorphic style composite specimens identified by the Rock Identifier community.
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Obsidian
Obsidian (volcanic glass)
Igneous
Zoisite with Ruby (Anyolite)
Anyolite (Ca2Al3(SiO4)3(OH) + (Hb, Al, Cr)2O3)
metamorphic
Yellow Quartzite River Cobble
Meta-quartzite (SiO2 with iron oxide staining)
metamorphic
Rough Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Pebble (likely a type of sandstone or quartzite pebble)
Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.
Sedimentary rock
Gneiss pebble
Banded gneiss, commonly quartz–feldspar–biotite gneiss
metamorphic
Clear Quartz (Rock Crystal)
Quartz (SiO₂)
Mineral
Soapstone
Steatite (composed primarily of Talc: Mg3Si4O10(OH)2)
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Fluorite-Gedrite in Quartz (Schist)
Fluorite (CaF2) with Gedrite in Quartz/Feldspar Matrix
metamorphic
Granitic Gneiss
Gneiss (Polymetamorphic Granitic Gneiss)
metamorphic
Anthracite Coal
Anthracite (Carbon C)
metamorphic
Quartz
Quartz (SiO₂ - Silicon Dioxide)
mineral
Hypersthene (or Enstatite/Ferrosilite)
Orthopyroxene series (Mg,Fe)SiO3 - specifically, historically hypersthene (intermediate member) now referred to as Enstatite (Mg-rich) or Ferrosilite (Fe-rich)
Mineral
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Milky Quartz
Quartz (SiO2)
Mineral
Jasper (Mookaite style)
Silicon Dioxide (SiO2) with iron and manganese inclusions
sedimentary
Schist
Schist (various mineralogical compositions including mica, chlorite, talc, etc.)
Metamorphic
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
White calcite (likely tumbled calcite or marble fragment)
Calcite, calcium carbonate (CaCO₃); if the specimen is granular and rock-like, it may be marble, a calcite-rich metamorphic rock
mineral
Quartz
Quartz (SiO₂)
Mineral
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Rhodonite
Rhodonite (MnSiO3)
Mineral
Quartz
Quartz (SiO₂)
Mineral
Fossiliferous Limestone
Limestone (composed primarily of calcite with included fossils CaCO3)
Sedimentary
Banded Gneiss
Gneiss (Metamorphic high-grade rock)
metamorphic
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Quartz
Silicon Dioxide (SiO2)
Mineral
Shale or Argillite
Shale (sedimentary) / Argillite (metamorphic)
Sedimentary or Metamorphic (low-grade)
Quartz (possibly milky quartz)
Quartz (Silica; SiO₂)
Mineral
Quartz cluster, possibly druzy quartz on matrix
Quartz (SiO₂), likely microcrystalline to coarse crystalline; associated matrix uncertain
mineral
Note on Image Identification: Textile
N/A (Anthropogenic material)
not a rock
Nephrite Jade
Ca2(Mg, Fe)5Si8O22(OH)2
metamorphic
Orthoclase Feldspar (or K-Feldspar)
Orthoclase (KAlSi3O8)
Mineral
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Mica-rich metamorphic rock, likely schist
Muscovite–biotite schist, possibly with quartz and feldspar
metamorphic
Hematite
Hematite (Fe2O3)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartz
Silicon Dioxide (SiO2)
Mineral
Tumbled metamorphic pebble, likely gneiss
Foliated gneiss; commonly quartz, feldspar, mica, and amphibole
metamorphic
Granite
Granite (a common rock name, not a single mineral species, composed primarily of quartz, feldspar, and mica/amphibole)
igneous