Sedimentary Rock (Possibly A Conglomerate Or Coarse Grained Sandstone)

Gneiss

Gneiss

Greywacke

Lithic Wacke

Weathered brown rock fragment

Indeterminate; possibly ferruginous sandstone or weathered volcanic rock

Concrete / Conglomerate (Man-made)

Artificial Conglomerate (Cementitious Composite)

Yellow Quartzite

Silicon Dioxide (SiO2)

Brown quartz-rich pebble (likely chert or weathered quartzite)

Quartz (SiO₂), possibly microcrystalline quartz/chert or quartzite

Weathered granite pebble

Granite, mainly quartz, feldspar, and mica; approximate composition SiO₂-rich continental crust

Weathered sandstone or volcanic rock fragment

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

Weathered sandstone or arkosic sandstone

Clastic sandstone, likely quartz–feldspar-rich (arkose)

River Pebbles (Chert and Quartzite)

Sedimentary Clastic Rock (Silica-rich)

Banded metamorphic rock, likely gneiss

Biotite–quartz–feldspar gneiss, possibly amphibolite-bearing

Breccia

Sedimentary Breccia

Unidentified brown rock fragment

Likely iron-stained sandstone or weathered conglomeratic rock; species cannot be confirmed from the image

Conglomerate

Conglomerate

Rounded granite or granitic gneiss cobble

Granite; primarily quartz, feldspar, and mica (exact identification requires a fresh surface and testing)

Jasper Conglomerate

Polymictic Conglomerate with Jasper and Quartz

Granite (likely weathered quartz-bearing granite)

Granite; primarily quartz, feldspar, and mica/amphibole

Biotite-rich gneiss (possibly mica schist)

Quartz–feldspar–biotite gneiss; mica-rich metamorphic rock

Weathered quartz-rich rock, possibly quartzite or iron-stained quartz

Quartzite (mostly SiO₂), with possible iron-oxide staining and minor feldspar/mica

Red Granite

Phaneritic Felsic Igneous Rock (Granite)

Weathered granite or granitic gneiss

Granite: quartz, feldspar, and mica; possibly gneiss if the dark minerals are banded

Conglomeratic breccia

Clast-supported polymictic conglomerate/breccia, cemented by silica- or carbonate-rich matrix

Weathered granite or granitic gneiss fragment

Quartz–feldspar–mica granite; possibly foliated granitic gneiss

Conglomerate (Pebble Conglomerate)

Conglomerate

River Cobble (Quartzite/Granite mix)

Quartzite-rich river stone

André's Landing Rock (Sandstone Boulder)

Newark Supergroup Sandstone (likely Stockton Formation)

River Pebble (Granite/Sandstone Pebble)

Rounded Quartz/Feldspar Gravel Clast

Fossiliferous limestone

Bioclastic limestone, primarily calcite (CaCO₃)

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Veined Pebble (likely a Quartz-Veined Pebble)

Pebble with Mineral Vein (e.g., Quartz Vein in a Chert/Mudstone Pebble)

Banded Gneiss

Gneiss (Felsic to Mafic Metamorphic Rock)

Iron-rich sandstone or laterite fragment

Ferruginous sandstone; possibly laterite/goethite-rich ironstone

Tumbled pegmatitic granite

Coarse-grained granite/pegmatite, chiefly quartz, feldspar, and biotite or amphibole

Brick fragment (Man-made material)

N/A (Fired clay)

Fossiliferous Siltstone

Clastic Sedimentary Rock with Fossil Inclusions

Gneiss

Gneiss (High-grade Metamorphic Rock)

Banded gneiss (likely biotite-bearing)

Gneiss; quartz–feldspar–mica assemblage, with possible iron-oxide staining

Conglomerate

Clastic Sedimentary Rock

Mixed sandstone and iron-rich sedimentary rock fragments

Quartz arenite/subarkose, with ferruginous cement and possible iron-oxide staining

Sedimentary Breccia

Breccia (Clastic Sedimentary Rock)

Orange Quartzite (River Pebble)

Quartzite (SiO2 with iron oxide inclusions)

Biotite-rich granite or granitic gneiss

Quartz–feldspar–biotite granite; possibly foliated granitic gneiss