Man Made Rock (Technosol)

Gneiss (Schistose)

Gneiss

Yellow Quartzite (River Pebble)

Quartzite (primarily SiO2)

Chert (Siliceous Mudstone variant)

Microcrystalline quartz (SiO2)

André's Landing Rock (Sandstone Boulder)

Newark Supergroup Sandstone (likely Stockton Formation)

Auriferous Quartz (Gold-bearing Quartz)

Silicon Dioxide (SiO2) with Elemental Gold (Au)

Carnelian Agate

Chalcedony (SiO2 with iron oxide impurities)

Pyrite in Shale

Iron Disulfide (FeS2) in Argillaceous Shale

Porphyry

Porphyritic Basalt or Porphyritic Andesite

Chert / Flint Nodules in Limestone

Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)

Chert (and Flint variant)

Microcrystalline Quartz (SiO2)

Chert (often called Flint or Jasper)

Chert (Microcrystalline or Cryptocrystalline Silica, SiO2)

Amygdaloidal Basalt with Zeolite/Quartz Infill

Amygdaloidal Basalt (Host: (Mg,Fe)2SiO4 / CaAl2Si2O8; Infill: SiO2 or Na2Al2Si3O10·2H2O)

Jasper with Quartz Veining

Silicon Dioxide (SiO2) with iron oxide inclusions

Gossan (Iron Hat)

Limonitic Gossan (predominantly FeO(OH)·nH2O)

Chevron Amethyst

Silicon Dioxide (SiO2) with iron impurities

Granite Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Oolitic Chert

Silicon Dioxide (SiO2) with oolitic texture

Emerald in Matrix (Quartz/Schist)

Beryl (Be₃Al₂Si₆O₁₈) with Chromium/Vanadium impurities

Milky Quartz

Silicon Dioxide (SiO2)

Agate (Moss or Dendritic Agate)

Chalcedony (Silicon Dioxide, SiO2)

Quartz (specifically Milky/Gray Quartz)

Silicon Dioxide (SiO2)

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Basalt

Basalt (Fine-grained extrusive igneous rock)

Basalt

Basalt (containing mainly Plagioclase feldspar and Pyroxene)

Serpentine

Serpentinite (composed mainly of Group Minerals Antigorite, Chrysotile, and Lizardite; Mg3Si2O5(OH)4)

Basalt

Mafic Igneous Rock (composed primarily of Plagioclase and Pyroxene)

Basalt

Basalt (Aphanitic Mafic Volcanic Rock)

Basalt with Epidote/Chlorite

Amygdaloidal Basalt (SiO2 with (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH)))

Basalt (Vesicular and Ropey)

Vesicular Basalt / Pahoehoe Basalt

Quartz on Schist

Silicon Dioxide (SiO2) on Foliated Metamorphic Rock

Agate (Polished Nodule)

Agate (Silicon Dioxide, SiO2)

Sandstone (Quartz Sandstone)

Clastic sedimentary rock (primarily SiO2)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Iron Oxide cement)

Shale

Fissile mudstone (primarily clay minerals and silt-sized quartz)

River Pebble (Quartzite/Sandstone mix)

Quartzite (primarily SiO2)

Shale

Fissile Mudstone

Shale

Fissile Mudrock (Clay-rich Sedimentary Rock)

Pink Granite

Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Plagioclase)

Shale

Mudstone/Shale

Quartzite

Quartzite (primarily SiO2)

Granite

Plutonic felsic rock (Quartz, Feldspar, Mica)