Mixed: Igneous And Sedimentary

Black Tourmaline

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

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

Weathered brown sandstone or quartzite cobble

Indeterminate sandstone; possibly quartz-rich quartzite

Mixed sandstone and iron-rich sedimentary rock fragments

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

Granite

Felsic intrusive igneous rock

Quartz-rich feldspar rock, possibly pegmatitic granite

Granite or granitic pegmatite; mainly quartz (SiO₂) and feldspar, with possible mica

Conglomerate

Conglomerate

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)

Quartz with Iron Staining

Silicon Dioxide (SiO2) with Hematite/Limonite inclusions

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

Silicon Dioxide (SiO2) with various inclusions

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)

Jasp-Agate

Cryptocrystalline Quartz (SiO2) with Iron Oxide inclusions

Quartz-rich conglomeratic breccia

Polymictic clast-supported conglomerate/breccia, dominated by quartz and feldspar

Granite

Intrusive Igneous Rock

Gravelly, weathered sediment (likely glacial till)

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

Conglomerate

Conglomeratic Sandstone

Weathered sandstone or granitic rock fragment

Indeterminate siliciclastic rock; likely quartz–feldspar–mica aggregate

Likely weathered limestone

Calcite-rich limestone (mostly CaCO₃), possibly dolomitic limestone

Polygenetic Conglomerate (Puddingstone)

Conglomerate (SiO2 matrix with mixed clasts)

Gossan (Iron Cap)

Limonitic Gossan (Fe2O3·nH2O mixed)

Amazonite with Smoky Quartz and Feldspar

Microcline (KAlSi3O8) with Quartz (SiO2)

Mixed river pebbles (gravel)

Polymictic alluvial gravel; diverse clasts, likely including quartz, feldspar-rich granitoids, and metamorphic rocks

Gravel and Pavement Aggregates

Unconsolidated rock fragments / detrital sediments

Mahogany Obsidian

Volcanic Glass (SiO2 with Hematite/Magnetite inclusions)

Jasper with Quartz

Silicon Dioxide (SiO2) - Chalcedony variety

Glacial Cobbles (predominantly Granite and Gneiss)

Mixed lithologies (Quartz, Feldspar, Mica assemblage)

Likely quartz-rich gravel fragment (uncertain identification)

Quartz, silicon dioxide (SiO₂), possibly mixed with feldspar or other light-colored minerals

Conglomerate

Conglomerate

Weathered conglomeratic breccia

Polymictic conglomerate/breccia, likely iron-stained

Mixed rock and mineral collection

Mixed lithologies; likely quartz, feldspar, basalt, granite, chert, sandstone, and metamorphic rocks

Pink granite

Felsic intrusive igneous rock; chiefly quartz, alkali feldspar, plagioclase, and dark biotite/hornblende

Weathered granite (likely biotite granite)

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

Quartz-rich granitic fragment

Granite or granitic pegmatite; chiefly quartz (SiO₂), feldspar, and minor mica

Pink Granite

Intrusive Igneous Rock (high K-feldspar content)

Kaolin (China Clay)

Kaolinite [Al2Si2O5(OH)4]

Small polished gemstone chips, likely mixed quartz varieties

Quartz (SiO₂), possibly including smoky quartz and other varieties; exact identification is uncertain from the image