Gravelly, weathered sediment (likely glacial till)
Unconsolidated diamicton; mixed lithologies, commonly including quartz, feldspar, and weathered silicate rock fragments
sedimentary
Category
Metamorphic Or Sedimentary Depending On Local Grade
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Diorite
Phaneritic Intermediate Igneous Rock
igneous
Kyanite (in Schist Matrix)
Kyanite (Al2SiO5)
metamorphic
Jasper
Agate/Jasper (Microcrystalline Quartz, SiO2)
sedimentary
Jasper
Jasper (Silica/Quartz) - SiO2
sedimentary
Mica Schist
Mica Schist (contains muscovite/biotite, quartz, plagioclase)
metamorphic
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Weathered gray sandstone or siltstone
Clastic siliciclastic rock, primarily quartz and feldspar grains cemented by silica or carbonate
sedimentary
Milky Quartz with Mica inclusions
Silicon Dioxide (SiO2) with Muscovite/Biotite
mineral
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Sandstone with Quartz Vein
Arenite with Quartz (SiO2) protrusion
sedimentary
Slate
Metamorphic Mudstone / Shale
metamorphic
Sandstone (Weathered Cobble)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Granite Boulder (Glacial Erratic)
Granite
igneous
Milky Quartz with Iron Staining
Crystalline Silicon Dioxide (SiO2)
mineral
Weathered Gabbro or Diorite (Igneous Cobble)
Phaneritic Basic/Intermediate Igneous Rock
igneous
Biotite schist
Mica schist; chiefly quartz, feldspar, and biotite mica
metamorphic
Banded gneiss (likely orthogneiss or paragneiss)
Gneiss; composition commonly quartz + feldspar + mica, with possible amphibole/biotite
metamorphic
Gneiss with Quartz Veining
Gneiss (High-grade Metamorphic Rock)
metamorphic
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides
sedimentary
Seraphinite (Clinochlore)
Clinochlore (Mg,Fe2+)5Al(Si3Al)O10(OH)8
mineral
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Iron-rich quartzite or silicified ironstone
Quartz (SiO₂) with iron oxides/hydroxides, likely limonite/goethite and possibly hematite
metamorphic
Gneiss
High-grade foliated metamorphic rock
metamorphic
Banded Calcite (often sold as Onyx)
Calcite (Calcium Carbonate, CaCO3)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron-Oxide Cement
sedimentary
Schist
Metamorphic Rock (Schist)
metamorphic
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
Green Schist
Greenschist (Chlorite Schist)
metamorphic
Veined Quartzite / Vein-filled Sedimentary Rock
Siliciclastic rock with iron oxide-filled fractures
sedimentary
Slate
Metamorphic Pelitic Rock
metamorphic
Gneiss
Feldspathic biotite gneiss; a high-grade metamorphic rock composed mainly of quartz, feldspar, and mica
metamorphic
Banded gneiss
Gneiss, commonly quartz–feldspar–mica gneiss
metamorphic
Greywacke (Briarcliff Schist/Gneiss)
Manhattan Schist / Fordham Gneiss complex
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Greenschist
Greenschist facies metamorphic rock
metamorphic
Dark gray foliated metamorphic rock, likely slate or phyllite
Slate/phyllite; chiefly quartz, mica, and chlorite
metamorphic
Tiger's Eye
Quartz pseudomorph after crocidolite (SiO2)
gemstone
Blue Sapphire and Diamond (Set in Metal)
Corundum (Al2O3) and Diamond (C)
mineral
Granitic Pegmatite with Tourmaline and Sphalerite
Pegmatite containing Schorl (NaFe3Al6(BO3)3Si6O18(OH)4) and Sphalerite ((Zn,Fe)S)
igneous