Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Category
Sedimentary Or Metamorphic (Base Substrate)
Browse sedimentary or metamorphic (base substrate) specimens identified by the Rock Identifier community.
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Pyrite (on Quartz/Host Rock)
Iron Sulfide (FeS₂)
mineral
Copper-bearing Mica Schist
Mica Schist with Native Copper inclusions
metamorphic
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Biotite Gneiss
Gneiss (complex mixture including Biotite K(Mg,Fe)3AlSi3O10(F,OH)2 and Quartz/Feldspar)
metamorphic
Pyrite-bearing sulfide specimen
Pyrite (FeS₂), possibly with chalcopyrite and weathered sulfides
mineral
Jasper Conglomerate (Puddingstone)
Siliceous Conglomerate (Quartz and Jasper clasts in a fine-grained matrix)
sedimentary
Mica-rich metamorphic rock, likely schist
Muscovite–biotite schist; principally muscovite mica, biotite, quartz, and feldspar
metamorphic
Polished pink quartzite or jasper
Quartzite, predominantly SiO₂; possibly iron-stained jasper/chalcedony
metamorphic
Small metallic-gold mineral fragment, possibly pyrite
Pyrite (FeS₂), if confirmed
mineral
Carved red coral bead (likely coral or coral-colored resin)
Corallium spp. (precious coral; calcium carbonate, CaCO₃)
gemstone
Muscovite Mica Schist
Metamorphic rock rich in muscovite mica (KAl2(AlSi3O10)(F,OH)2)
metamorphic
Biotite (Black Mica)
Biotite (K(Mg,Fe)3AlSi3O10(OH)2)
mineral
Mica Schist
Schist (muscovite-biotite rich)
metamorphic
Milky Quartz (Water-worn Pebble)
Silicon Dioxide (SiO2)
mineral
Mica Schist with Pyrite
Muscovite/Biotite Schist (Complex Silicate)
metamorphic
Muscovite Mica
Muscovite - KAl2(AlSi3O10)(OH)2
mineral
Schist (specifically Mica Schist)
Mica Schist (primarily composed of Muscovite KAl2(AlSi3O10)(OH)2 and Biotite)
metamorphic
Banded Slate or Siltstone with Quartz/Calcite Veins
Protolith-derived Siltstone or Slate (varies based on degree of metamorphism)
metamorphic
Metallic sulfide mineral fragment, likely galena
Galena (lead sulfide, PbS), tentative identification
mineral
Unidentified Rock
Unknown
sedimentary
Biotite-rich schist (likely mica schist)
Mica schist; predominantly quartz, biotite mica, and feldspar
metamorphic
Graphite
Graphite (Native Carbon, C)
metamorphic
Mica Schist
Mica Schist (predominantly Muscovite or Biotite sheet silicates)
metamorphic
Pyrite
Iron Disulfide (FeS2)
mineral
Biotite schist (mica schist), possibly garnet-bearing
Mica schist; chiefly quartz (SiO₂), feldspar, and biotite mica, with possible garnet
metamorphic
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium and/or Vanadium impurities
mineral
Fossil shark tooth
Likely fossilized shark tooth, possibly Carcharhinus or Otodus species
fossil
Muscovite Schist
KAl2(AlSi3O10)(OH)2 (Muscovite) in Schist Matrix
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Goethite pseudomorph after Pyrite
Goethite (FeO(OH)) pseudomorph after Pyrite (FeS2)
mineral
Sandstone (Micaceous Sandstone)
Arenite (SiO2 with KAl2(AlSi3O10)(OH)2 inclusions)
sedimentary
Pearl
Nacre (aragonite, CaCO₃, in an organic conchiolin matrix)
gemstone
Mica Schist
Mica Schist (Quartz-Mica Metamorphic Rock)
metamorphic
Mica-rich Sandstone or Micaceous Schist Weathering
Micaceous Schist (Muscovite-Quartz composition)
Metamorphic or Sedimentary depending on local grade
Fossil shark tooth
Likely fossilized shark tooth, possibly *Carcharocles* or *Otodus* species
fossil
Unidentified Rock Fragment
Unknown
Rock
Mica Schist with Iron Staining
Muscovite/Biotite Schist
metamorphic
Garnet-Bearing Gneiss
Almandine-Garnet Gneiss
metamorphic
Muscovite Mica
Muscovite (Potassium Aluminum Silicate Hydroxide Fluoride), KAl2(AlSi3O10)(OH,F)2
mineral
Pyrite-bearing rock, possibly pyrite schist or sulfide ore
Pyrite (iron disulfide, FeS₂), likely intergrown with dark metamorphic host minerals
mineral
Black Spinel
Magnesium Aluminum Oxide (MgAl2O4)
mineral