Mixed

Weathered granite

Granite, a coarse-grained felsic intrusive igneous rock

Weathered granite pebble

Granite, a quartz–feldspar–mica plutonic rock

Blue-gray granite or granitic gneiss pebble

Granite, chiefly quartz, feldspar, and biotite/amphibole

Weathered polymictic gravel/conglomeratic rock

Polymictic conglomerate or poorly lithified alluvial gravel; chiefly quartz, feldspar, mica, and dark lithic fragments

Tumbled granite pebble

Granite, primarily quartz–feldspar–mica aggregate

Polished granite cobble

Granite, typically quartz–feldspar–biotite granite

Tumbled granite or granitic gneiss

Granite; primarily quartz, alkali feldspar, plagioclase, and mica

Coarse-grained igneous rock, likely granitic pegmatite or weathered granite

Granite/pegmatitic granite; chiefly quartz (SiO₂), feldspar, and dark mica or amphibole

Tumbled polymictic stone, likely jasper-bearing conglomerate

Siliciclastic conglomerate with microcrystalline quartz (jasper/chert) and altered volcanic or feldspathic clasts

Granite

Granite (Phaneritic intrusive igneous rock)

Sodalite

Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2)

Ferrous Slag

Fused calcium-iron silicates (Industrial Slag)

Granite

Intrusive Igneous Rock

Sugilite

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

Granodiorite

Phaneritic-textured Intrusive Granodiorite

Red jasper (polished/cut rough)

Jasper, microcrystalline quartz (SiO₂), colored mainly by iron oxides

Tumbled banded stone, likely gneiss or granite

Quartz–feldspar rock, possibly banded gneiss; exact identification requires testing

Garnet, likely almandine–spessartine

Garnet-group nesosilicate; commonly almandine Fe₃Al₂(SiO₄)₃ or spessartine Mn₃Al₂(SiO₄)₃

Iron-rich breccia, possibly hematite/goethite-bearing

Hematite (Fe₂O₃) and goethite (FeO(OH)) in a silica-rich breccia matrix

Rounded gravel / river pebbles

Polymictic alluvial gravel, commonly quartz-, feldspar-, and lithic-rich clasts

Polished quartz-rich feldspar rock, possibly orbicular granite

Granite or granitic pegmatite; chiefly quartz (SiO₂), feldspar, and dark biotite/amphibole

Fuchsite

Chromium-rich Muscovite Mica

Chrysocolla-bearing copper ore

Chrysocolla (hydrated copper aluminosilicate, approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O), likely with malachite and copper sulfides

Weathered granitic rock fragment

Likely granite or granodiorite, composed mainly of quartz, feldspar, and mica

Conglomeratic volcanic breccia

Lithic volcanic breccia, likely andesitic or basaltic

Polished/tumbled chalcedony (likely agate or jasper)

Microcrystalline quartz, SiO₂; possibly quartz-rich silicified material

Mixed river-worn landscaping stones, mostly likely quartzite and other silicate rocks

Indeterminate mixed lithologies; the pale gray pieces may be quartzite (quartz-rich rock, SiO₂)

Composite Turquoise or Reconstituted Turquoise with Copper inclusions

CuAl6(PO4)4(OH)8·4H2O (Turquoise) mixed with matrix and copper/bronze flakes

Banded Chert / Jasper

Silicon Dioxide (SiO2)

Polished gemstone beads, likely brown tiger’s eye with an orange bead and a green bead

Tiger’s eye: fibrous quartz (SiO₂) with iron-oxide inclusions; the orange and green beads cannot be identified confidently from the image

Tumbled green aventurine and/or serpentine

Quartz variety aventurine (SiO₂) and possibly serpentine-group minerals

Mixed small mineral specimens

Likely quartz varieties with possible rose quartz and iron-stained quartz; exact identification is uncertain from the blurred image

Garnet crystals

Garnet-group silicates, likely almandine (Fe₃Al₂Si₃O₁₂)

Mixed rounded river pebbles

Polymictic alluvial gravel; likely quartz/quartzite, chert, and weathered feldspathic rocks

Gemstone bead necklace, likely mixed tourmaline and quartz

Probable schorl/dravite tourmaline with quartz or smoky quartz; exact identification requires testing

Mixed tumbled stone collection

Assorted minerals, likely including quartz, jasper, agate, and possibly obsidian or hematite

Decorative polished pebbles

Likely mixed quartz-rich lithologies, including quartzite, jasper, and/or basalt

Mixed landscaping gravel and rounded fieldstones

Lithologically mixed aggregate; likely quartzite, basalt, granite, and weathered sedimentary rocks

Mixed rock and mineral collection

Multiple specimens; visible examples may include quartz (SiO₂), amethyst (quartz), calcite (CaCO₃), and dark mafic rocks

Mixed mineral and rock specimen collection

Mixed assemblage, visibly including quartz, chalcedony/agate, feldspar, mica, dark mafic rocks, and possibly calcite or gypsum

Conglomerate (pebble conglomerate)

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

Unidentified fine mineral/rock powder

Indeterminate from image; possibly crushed quartz-rich sand or finely milled rock