Weathered Gabbro or Diorite (Igneous Cobble)
Phaneritic Basic/Intermediate Igneous Rock
igneous
Category
Metamorphic Or Sedimentary Depending On Local Grade
Browse metamorphic or sedimentary depending on local grade specimens identified by the Rock Identifier community.
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Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Charoite
Charoite (Hydrated potassium sodium calcium barium strontium silicate hydroxyfluoride)
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Milky Quartz with Mica inclusions
Silicon Dioxide (SiO2) with Muscovite/Biotite
mineral
Seraphinite (Clinochlore)
Clinochlore (Mg,Fe2+)5Al(Si3Al)O10(OH)8
mineral
Sandstone (Weathered Cobble)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides
sedimentary
Blue Sapphire and Diamond (Set in Metal)
Corundum (Al2O3) and Diamond (C)
mineral
Banded Calcite (often sold as Onyx)
Calcite (Calcium Carbonate, CaCO3)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron-Oxide Cement
sedimentary
Gneiss
High-grade foliated metamorphic rock
metamorphic
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Gemstones (Emerald and Yellow Topaz or Citrine)
Beryl (Be3Al2Si6O18) and Quartz (SiO2) or Topaz (Al2SiO4(F,OH)2)
mineral
Grey River Pebble (Likely Quartz-rich or Limestone)
Clastic Sedimentary Rock (typically SiO2 or CaCO3 based)
sedimentary
Garnet Gneiss
Gneiss containing almandine-pyrope garnet
metamorphic
White Marble
Recrystallized Calcite Rock (CaCO3)
metamorphic
Granitic Pegmatite with Tourmaline and Sphalerite
Pegmatite containing Schorl (NaFe3Al6(BO3)3Si6O18(OH)4) and Sphalerite ((Zn,Fe)S)
igneous
Quartz (Smoky/Milky variety with matrix)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Greenstone / Glauconitic Siltstone
Metabasalt or Glauconite-rich Sedimentary Rock
metamorphic or sedimentary
Greywacke (Briarcliff Schist/Gneiss)
Manhattan Schist / Fordham Gneiss complex
metamorphic
White Howlite
Howlite (Calcium borosilicate hydroxide, Ca2B5SiO9(OH)5)
mineral
Chert (specifically Yellow Jasper)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Granite Gneiss
Granitic Gneiss
Metamorphic
Sandstone Beach Pebble
Clastic Sandstone (SiO2 - Quartz-dominant)
sedimentary
Kyanite
Kyanite (Al2SiO5)
mineral
Schist
Schist (various mineral compositions)
metamorphic
Green Schist
Greenschist (Chlorite Schist)
metamorphic
Kyanite
Kyanite (Al2SiO5)
Mineral
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Dragon Blood Jasper
Epidote with Red Jasper (Quartz-rich aggregate)
sedimentary
Quartz (Smoky/Milky variety with inclusion)
Silicon Dioxide (SiO2)
mineral
Milky Quartz with Matrix
Quartz (Silicon Dioxide, SiO2)
mineral
Greenschist
Greenschist facies metamorphic rock
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic Plutonic Felsic Rock (Granite)
igneous
Pyrite
Iron Sulfide (FeS2)
mineral
Granite Glacial Erratic
Granite (Phaneritic Quartz-Feldspar Plutonic Rock)
igneous
Clear Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Pumice
Vesicular volcanic glass
igneous
Quartz (specifically a water-worn river pebble)
Silicon Dioxide (SiO2)
Mineral