Sedimentary Rock (Possibly A Conglomerate Or Coarse Grained Sandstone)

Weathered sandstone or quartzite cobble

Quartz-rich sandstone; possibly weakly metamorphosed quartzite

Quartz Pebble

Silicon dioxide (SiO2)

Sandstone

Arenite (specifically sublithic or quartz arenite)

Sandstone (likely Ferruginous)

Sandstone (SiO2 with iron oxides)

Sandstone (lithic wacke)

Arenite / Lithic Wacke (mostly SiO2 with rock fragments)

Quartz-rich rock, likely milky quartz or quartzite

Quartz (SiO₂), possibly quartzite with iron-oxide staining

Brown Sandstone (River Rock)

Arenite

Sandstone

Arenite

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone Pebble

Sedimentary Rock (Quartzose Sandstone)

Sandstone

Arenite (primarily SiO2)

Weathered quartz-bearing metamorphic rock

Likely quartz–feldspar schist or gneiss, possibly with iron-oxide alteration

Weathered feldspar-rich granite fragment

Granite, primarily quartz (SiO₂), feldspar, and mica

Weathered quartz-rich rock, possibly quartzite or silicified sandstone

Quartzite (predominantly microcrystalline quartz, SiO₂); precise identification requires testing

Polished granite pebble

Granite, a quartz–feldspar plutonic rock

Sandstone

Sandstone (Arenite)

Sandstone (Quartzose)

Arenite (composed primarily of SiO2)

Sandstone

Arenite (Sedimentary rock)

Sandstone (likely Quartz Sandstone)

Arenite (SiO2 based)

Coarse-grained Granite

Granitoid (Felsic Plutonic Rock)

Rounded gray-green stone, likely fine-grained sandstone or siltstone

Indeterminate clastic sedimentary rock; exact identification requires closer examination

Gabbro (likely with Pyrite/Sulfide mineralization)

Mafic Intrusive Igneous Rock

Weathered granitic rock

Granite or granodiorite; chiefly quartz, feldspar, and mica/amphibole

Sandstone

Arenite (primarily SiO2)

Weathered sandstone or iron-stained quartzite

Quartz-rich sandstone; possibly weakly metamorphosed quartzite (SiO₂ with iron-oxide coatings)

Sandstone (likely Arkosic or Lithic Sandstone)

Arenite (composed primarily of SiO2 with various lithic fragments)

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly crystalline SiO₂, possibly with mica or feldspar

Sandstone (Quartzose)

Arenite (primarily SiO2)

Sandstone

Arenite (SiO2 based with mineral cement)

Sandstone (likely Quartzose Sandstone)

Arenite (SiO2 principal composition)

Sandstone

Sedimentary Rock (Quartz Sandstone)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Weathered quartz-bearing sandstone

Quartz arenite or feldspathic sandstone (tentative)

Unidentified brown rock fragment

Not identifiable from the image; possibly iron-stained sandstone or another common weathered rock

Sandstone

Arenite (clastic sedimentary rock)

Granite-like gneiss

Foliated quartz–feldspar–mica gneiss, possibly granitic protolith

Sandstone

Sedimentary Rock (Quartz Sandstone)

Sandstone

Arenite

Red granite or granitic gneiss cobble

Quartz–feldspar–mica rock; likely granite, possibly gneiss

Quartz-rich rock fragment, possibly milky quartz or quartzite

Quartz (SiO₂), or quartzite if the grains are fused

Limestone

Calcite-rich limestone (primarily CaCO₃)

Lichen-covered granite or granitic gneiss

Granite: quartz + feldspar + mica; possibly gneiss if foliation is confirmed