Metamorphic Or Sedimentary Depending On Local Grade

Garnet-Mica Schist

Garnetiferous Porphyroblastic Schist

Quartzite

Quartzite (SiO2)

Polygenetic Conglomerate (Puddingstone)

Conglomerate (SiO2 matrix with mixed clasts)

Fossilized Bone Fragment

Permineralized Skeletal Element (Likely Vertebrate)

Chert (Quartz Variety)

Microcrystalline Silica (SiO2)

Limestone (Concretionary or Tufa)

Calcium Carbonate (CaCO3)

Gneiss

High-grade metamorphic rock (Gneiss)

Banded Gneiss (River Cobble)

Gneiss (a high-grade metamorphic rock)

Fossilized Bone Fragment

Permineralized Vertebrate Bone (Hydrox yapatite replaced by Silica or Calcite)

Calcite with iron staining

Calcium Carbonate (CaCO3)

Greywacke (River Pebble)

Greywacke sandstone with quartz veining

Fossiliferous Sedimentary Rock (Coquina/Limestone)

Fossiliferous Calcarenite / Bioclastic Limestone

Kyanite (in Schist Matrix)

Kyanite (Al2SiO5)

Chert (Jasper variety)

Microcrystalline quartz (SiO2)

Jasper

Agate/Jasper (Microcrystalline Quartz, SiO2)

Jasper

Jasper (Silica/Quartz) - SiO2

Green Fluorite

Calcium Fluoride (CaF2)

Charoite

Charoite (Hydrated potassium sodium calcium barium strontium silicate hydroxyfluoride)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Seraphinite (Clinochlore)

Clinochlore (Mg,Fe2+)5Al(Si3Al)O10(OH)8

Sandstone (Weathered Cobble)

Clastic Sedimentary Rock (primarily SiO2)

Gneiss

High-grade foliated metamorphic rock

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxides

Milky Quartz with Mica inclusions

Silicon Dioxide (SiO2) with Muscovite/Biotite

Greywacke (Briarcliff Schist/Gneiss)

Manhattan Schist / Fordham Gneiss complex

Banded Calcite (often sold as Onyx)

Calcite (Calcium Carbonate, CaCO3)

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement

Grey River Pebble (Likely Quartz-rich or Limestone)

Clastic Sedimentary Rock (typically SiO2 or CaCO3 based)

Kyanite

Kyanite (Al2SiO5)

Kyanite

Kyanite (Al2SiO5)

Schist

Schist (various mineral compositions)

Diorite

Diorite (Intermediate intrusive igneous rock)

Greenstone / Glauconitic Siltstone

Metabasalt or Glauconite-rich Sedimentary Rock

White Howlite

Howlite (Calcium borosilicate hydroxide, Ca2B5SiO9(OH)5)

Chert (specifically Yellow Jasper)

Sedimentary Cryptocrystalline Quartz (SiO2)

Sandstone Beach Pebble

Clastic Sandstone (SiO2 - Quartz-dominant)

Quartz (Smoky/Milky variety with matrix)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Granitic Pegmatite with Tourmaline and Sphalerite

Pegmatite containing Schorl (NaFe3Al6(BO3)3Si6O18(OH)4) and Sphalerite ((Zn,Fe)S)

Pebble (likely Quartz or Chert)

SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)