Sedimentary And Igneous (Mixed)

Tumbled granite or granitic gneiss

Granite/granitic gneiss, chiefly quartz, feldspar, and dark mica or amphibole

Pink Granite

Phaneritic Felsic Igneous Rock (Rich in K-Feldspar)

Mixed sandstone and iron-rich sedimentary rock fragments

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

Granite Pebble

Intrusive Igneous Rock (Granite)

Greenstone / Diorite

Intermediate plutonic igneous rock

Weathered quartz-bearing rock fragment

Indeterminate; likely quartz-rich granite, gneiss, or pegmatitic rock

Concrete rubble

Anthropogenic conglomerate

Diorite

Diorite (plutonic igneous rock)

Mixed beach gravel and sand

Unsorted siliciclastic sediment, chiefly quartz and rock fragments

River Pebbles (White Quartz and Basalt mix)

Mixed Clastic Sedimentary Assemblage (SiO2 and Mafic Volcanics)

Granite (Pink/Potassium Feldspar rich)

Granite (K-feldspar rich intrusive igneous rock)

Mixed river gravel (likely alluvial sediment)

Unconsolidated polymictic gravel; rock fragments of varied composition

Mixed Tumbled Gemstones and River Rocks

Mixed Decorative Stones (predominantly Silicon Dioxide - SiO2 variants)

Conglomerate

Sedimentary Conglomerate

Yellow Jasper

Jasper (Silicon Dioxide with Iron Hydroxide impurities, SiO2 + FeO(OH))

Weathered quartz-rich rock, likely vein quartz

Mostly silicon dioxide (SiO₂); exact rock type cannot be confirmed from the photograph

Quartz geode

Microcrystalline and crystalline quartz, SiO₂, likely with chalcedony and iron-oxide staining

Black Tourmaline

Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)4)

Likely weathered granite or granitic rock

Granite; quartz + feldspar + mica, compositionally variable

Granite pebble

Coarse-grained granitic rock, primarily quartz–feldspar–biotite

Granodiorite

Intermediate Phaneritic Plutonic Rock

Granite

Granite (Felsic Plutonic Rock)

Granite

Intrusive Igneous Rock

Mixed Quartz Bracelet (Rose Quartz and Larimar-colored beads)

Silicon Dioxide (SiO2) with various inclusions

Mixed gemstone specimens

Likely pink sapphire or tourmaline, red garnet, blue sapphire, precious opal, and green tourmaline/emerald; exact identities cannot be confirmed from the collage

Quartz with Iron Staining

Silicon Dioxide (SiO2) with Hematite/Limonite inclusions

Greenstone or Epidote-rich rock

Epidote or Chlorite schist/greenstone

Conglomerate

Conglomeratic Sandstone

Granite / Feldspar gravel

Granite (felsic intrusive igneous rock)

Conglomerate (pebble-rich rock)

Clastic sedimentary rock composed of rounded pebble- to gravel-sized clasts cemented in a finer matrix

Conglomerate

Conglomerate

Granite

Felsic intrusive igneous rock

Fluorite

Calcium Fluoride (CaF2)

Polygenetic Conglomerate (Puddingstone)

Conglomerate (SiO2 matrix with mixed clasts)

Gossan (Iron Cap)

Limonitic Gossan (Fe2O3·nH2O mixed)

Gravelly, weathered sediment (likely glacial till)

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

Pegmatite fragment

Granitic pegmatite, composed mainly of quartz, feldspar, and mica

Likely gabbro or diabase

Mafic igneous rock, chiefly plagioclase feldspar and pyroxene; possible olivine and amphibole

Likely weathered granite or granitic gneiss

Granite: quartz + feldspar + mica; possibly gneiss if the faint banding is structural

Granite Pebble (Pegmatitic Quartz-Feldspar River Rock)

Granite / Quartz-Feldspar-Mica Aggregate

Red Granite

Granite (Felsic Plutonic Rock)

Weathered brown sandstone or quartzite cobble

Indeterminate sandstone; possibly quartz-rich quartzite