Igneous

Rounded gray granitoid pebble

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

Granite

Granite (Felsic intrusive igneous rock)

Granite

Granite (Mainly Quartz, Feldspar, and Mica/Amphibole)

Granite

Granite

Porphyritic Rhyolite (Birdseye Rhyolite)

Rhyolite (Porphyritic texture)

Granite

Granite (Phaneritic igneous rock)

Porphyritic Igneous Rock / Granite or Rhyolite Porphyry

Porphyritic intrusive/extrusive igneous rock

Granite

Phaneritic Felsic Igneous Rock

Granite

Phaneritic Felsic Igneous Rock

Dalmatian Stone

Peralkaline Feldsphathic Igneous Rock

Pink Granite

Granite (Phaneritic Igneous Rock)

Weathered granite (likely)

Granite, a coarse-grained felsic intrusive igneous rock composed chiefly of quartz, feldspar, and mica

Small dark, speckled stone (likely granite or diorite)

Likely fine-grained granitoid; exact identification is uncertain from the small, blurry view

Rounded granite cobble

Granite, a coarse-grained felsic intrusive igneous rock composed chiefly of quartz, feldspar, and mica

Mixed river stones; foreground likely sandstone

Quartz-rich sandstone, with associated rounded quartzite/chert and other cobbles

Granite Pebble

Granite

Granitoid (Common Granite/Gneiss)

Granitoid (primarily Quartz [SiO2], Feldspar [KAlSi3O8], and Mica)

Weathered quartz-rich rock, possibly granite or pegmatite fragment

Uncertain; likely quartz–feldspar aggregate, potentially granitic pegmatite

Granite with Epidote

Granite, containing quartz, feldspar, and epidote

Granite

Granite (Phaneritic Quartz-Feldspar Plutonic Rock)

Milky Quartz in Epidote Host Rock

Crystalline Silicon Dioxide (SiO2) with Epidote Ca2(Al,Fe)3(SiO4)3(OH)

Granite

Phaneritic plutonic felsic rock (primarily Quartz, Feldspar, and Mica)

Dalmation Stone

Peralkaline Rock (mixed silicate minerals)

Dalmation Stone (often called Dalmatian Jasper)

Peralkaline Rock (Microgranite/Aplite), SiO2 with inclusions of Arfvedsonite

Conglomerate with Quartz Inclusions

Conglomerate (clastic sedimentary rock) with internal Quartz (SiO2)

Granite fragment

Granite (Felsic Plutonic Rock)

Quartz pebble with iron staining

Silicon dioxide (SiO2) with iron oxide inclusions

Blue Apatite

Fluorapatite / Apatite group (Ca5(PO4)3(F,Cl,OH))

Quartz pebble

Silicon dioxide (SiO2)

Blue Apatite

Apatite (Ca5(PO4)3(F,Cl,OH))

Sugilite

Sugilite (KNa2(Fe,Mn,Al)2Li3Si12O30)

Green Aventurine

SiO2

Peacock Ore

Bornite (Cu5FeS4)

Gabbro

Gabbro

Gabbro (Water-worn Pebble)

Gabbro

Likely magnetite-rich rock fragment

Magnetite (Fe₃O₄), possibly in a fine-grained host rock

Granite

Granite (Phaneritic Igneous Rock)

Granite Pebble

Felsic intrusive igneous rock

Milky Quartz with Matrix

Silicon Dioxide (SiO2)

Milky quartz

Quartz (SiO₂), likely massive milky quartz with minor iron-oxide staining and inclusions

Likely clear quartz pebble or glassy quartz fragment

Quartz (silicon dioxide, SiO₂)

Sodalite

Na8(Al6Si6O24)Cl2