Rock (Likely Sedimentary)

Druzy Quartz on Matrix (likely Limestone or Sandstone)

Silicon Dioxide (SiO2) with various trace impurities

Weathered limestone

Calcite-rich limestone (CaCO₃), possibly fossiliferous or dolomitic

Chert (Yellow Jasper/Flint)

Silicon Dioxide (SiO2)

Chert (Jasper variation)

Silicon Dioxide (SiO2)

Weathered sandstone or volcanic rock fragment

Indeterminate; likely quartz–feldspar-rich sandstone, possibly altered volcanic rock

Weathered granite or granitic gneiss fragment

Granite; chiefly quartz (SiO₂), feldspar, and mica, with iron-oxide weathering

Sandstone (likely Arkose or Quartz Sandstone)

Arenite (SiO2 + varied clasts)

Dalmatian jasper (likely orbicular rhyolite)

Silica-rich rhyolite, commonly sold as Dalmatian jasper; typically quartz, feldspar, and dark amphibole/biotite inclusions

André's Landing Rock (Sandstone Boulder)

Newark Supergroup Sandstone (likely Stockton Formation)

Weathered quartz-rich rock, likely sandstone or quartzite

Quartz-dominated clastic rock; possibly quartzite (SiO₂-rich)

Banded gneiss cobble

Gneiss, commonly quartz–feldspar–mica gneiss

Rounded sandstone pebble

Quartz-rich sandstone, likely subarkose or lithic sandstone

Paving-concrete aggregate with a rounded stone

Polymictic gravel aggregate; the central clast appears to be weathered sandstone or volcanic rock

Chert (Yellow Jasper/Flint)

Microcrystalline Quartz (SiO2)

Weathered quartz-rich sandstone

Quartz arenite (likely feldspathic sandstone)

Quartz-rich rock, likely milky quartz with iron staining

Quartz (SiO₂), possibly quartzite or quartz vein material

Fossiliferous limestone (likely ammonite/gastropod-bearing)

Bioclastic limestone; predominantly calcite (CaCO₃)

Gray foliated metamorphic rock, likely gneiss or schist

Quartz–feldspar–mica metamorphic rock; exact identification requires a fresh surface and testing

Tumbled jasper or iron-rich chert

Microcrystalline quartz (chalcedony), SiO₂, colored by iron oxides

Rounded sandstone or siltstone cobble

Clastic sedimentary rock, likely quartz-rich sandstone (possibly fine-grained siltstone)

Banded gneiss fragment

Gneiss, likely quartz–feldspar–mica gneiss

Tumbled sandstone pebble

Sandstone, primarily quartz (SiO₂) with feldspar and iron-oxide cement

Brown weathered river pebble

Indeterminate lithology; likely ferruginous sandstone, mudstone, or weathered volcanic rock

Sandstone (likely Graywacke or Arkose variant)

Clastic Sedimentary Rock (Lithic Sandstone)

Weathered quartz-rich river stone

Chert or silicified limestone/quartzite; exact identification requires testing

Fossiliferous limestone / shell hash rock

Bioclastic limestone (calcarenite or coquina), dominantly CaCO₃

Red jasper (likely polished/tumbled)

Jasper, microcrystalline quartz (SiO₂) colored by iron oxides

Dark metamorphic rock, likely schist or slate fragment

Indeterminate; possibly biotite schist, chlorite schist, or slate

Weathered gray metamorphic rock, likely schist or slate

Foliated silicate rock; possibly mica schist or phyllite

Granite fragment

Granite; mainly quartz (SiO₂), feldspar, and mica

Weathered sandstone or quartz-rich sedimentary rock

Likely quartz arenite/subarkose; predominantly quartz (SiO₂) with feldspar and iron-oxide cement

Reddish weathered volcanic rock, probably andesite

Andesite (fine-grained plagioclase–pyroxene volcanic rock), possibly altered basalt

Sandstone (Greywacke)

Arenite / Greywacke Sandstone

Sandstone (River Pebble)

Clastic Sedimentary Rock (primarily Quartzite/Arenite)

Travertine (Ceramic Tile)

Terrestrial Sedimentary Rock / Calcium Carbonate (CaCO3)

Weathered iron-rich sandstone or ferruginous sedimentary rock

Quartz-rich sandstone, locally cemented by iron oxides (primarily hematite/goethite)

River Pebble (Gneiss or Granite)

Metamorphic Rock (likely Gneiss or Granitic composition)

Rounded river pebble (likely weathered sandstone or chert)

Indeterminate clastic sedimentary rock; possible quartz-rich sandstone

Rounded brown river pebble

Indeterminate lithic fragment; likely weathered sandstone, mudstone, or fine-grained volcanic rock

Weathered iron-rich rock (likely ironstone or altered basalt)

Probable limonite/goethite-bearing basalt or ironstone; exact identification requires testing

Gravelly, weathered sediment (likely glacial till)

Unconsolidated diamicton; mixed lithologies, commonly including quartz, feldspar, and weathered silicate rock fragments

Quartz-rich geode or vuggy quartz rock

Quartz (SiO₂), likely with minor iron oxides and possibly calcite or feldspar