Mixed: Igneous And Sedimentary

Unidentified polished stone fragments

Indeterminate; likely mixed lapidary specimens, possibly jasper, agate, or quartz-bearing rock

Granite (Pink/Potassium Feldspar rich)

Granite (K-feldspar rich intrusive igneous rock)

Pink Granite

Phaneritic Felsic Igneous Rock

Pink Granite

Phaneritic Felsic Igneous Rock (Rich in K-Feldspar)

Granite / Feldspar gravel

Granite (felsic intrusive igneous rock)

Granite pebble

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

Granodiorite

Intermediate Phaneritic Plutonic Rock

Granite

Granite (Felsic Plutonic Rock)

Purple Lepidolite with Quartz

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

Concrete rubble

Anthropogenic conglomerate

Quartz with Iron Staining

Silicon Dioxide (SiO2) with Hematite/Limonite inclusions

Gravelly, weathered sediment (likely glacial till)

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

Breccia

Breccia (Clastic sedimentary rock)

Blue Apatite

Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)

Mookaite Jasper

Silicified Radiolarite (SiO2)

Gravel or Pebble

Clastic Sedimentary Grain (typically composed of Quartz or Silicate minerals)

Mahogany Obsidian

Volcanic Glass (SiO2 with Hematite/Magnetite inclusions)

Weathered brown sandstone or quartzite cobble

Indeterminate sandstone; possibly quartz-rich quartzite

Greenstone or Epidote-rich rock

Epidote or Chlorite schist/greenstone

Mixed collection of common river stones

Varied lithologies, visibly including quartz-rich rock, dark mafic rock, sandstone, and purple quartz-bearing material

Granite Pebble (Pegmatitic Quartz-Feldspar River Rock)

Granite / Quartz-Feldspar-Mica Aggregate

Red Granite

Granite (Felsic Plutonic Rock)

Granite Pebble

Intrusive Igneous Rock (Granite)

Greenstone / Diorite

Intermediate plutonic igneous rock

Conglomerate

Conglomeratic Sandstone

Granite

Granitic plutonic rock, chiefly quartz, alkali feldspar, plagioclase, and mica/amphibole

Granite Pebble

Granite (composed primarily of Quartz, Potassium Feldspar, Plagioclase, and Biotite/Amphibole)

Granite Pebble

Intrusive Igneous Rock (Quartz, Feldspar, Mica)

Pink Granite

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

Granodiorite (Weathered)

Granodiorite

Granodiorite (containing Biotite and Quartz)

Granodiorite (Plagioclase-rich phaneritic intrusive rock)

Gravel and Pavement Aggregates

Unconsolidated rock fragments / detrital sediments

Granite

Intrusive Igneous Rock

Yellow Jasper

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

Quartz-rich granitic cobble

Granite or granitic gneiss; primarily quartz, feldspar, and mica

Mixed rock and mineral collection

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

Glacial Cobbles (predominantly Granite and Gneiss)

Mixed lithologies (Quartz, Feldspar, Mica assemblage)

Granite Pebble

Granite

Conglomerate

Conglomerate

Amazonite with Smoky Quartz and Feldspar

Microcline (KAlSi3O8) with Quartz (SiO2)

Conglomerate

Conglomerate

Kaolin (China Clay)

Kaolinite [Al2Si2O5(OH)4]