Sedimentary And Igneous (Mixed)

Mixed gravel and stone fragments

Unidentified lithic clasts; individual rock types cannot be determined from the image

Mixed gravel and small stones

Unsorted gravel; individual clasts are not identifiable from the image

Mixed collection of small rounded pebbles

Unidentified river- or beach-worn lithic clasts; individual rock types cannot be determined confidently from the image

Mixed rounded river gravel

Polymictic alluvial gravel; likely mixtures of quartzite, granite, basalt, sandstone, and other silicate rocks

River Cobble (Mixed Lithology)

Clastic Sedimentary Rock (Silicified Siltstone or Wacke)

Mixed River Pebbles and Jasper

Siliciclastic sediment and microcrystalline quartz

Pink Granite (Crystalline Granite)

Igneous Intrusive Rock (Felsic Plutonic)

Polished labradorite-bearing rock

Labradorite, a calcium-rich plagioclase feldspar; likely mixed with quartz and mafic minerals

Likely quartz-bearing metamorphic pebble

Indeterminate; probable quartzite or quartz-rich gneiss with dark mica/amphibole

Mixed polished rock/mineral specimens

Indeterminate from image; likely quartz-bearing material with iron-oxide staining and possibly mica-rich schist

Peacock Ore

Bornite (Cu5FeS4)

Tumbled milky quartz

Quartz, SiO₂; trigonal crystal system

Quartz (likely milky or iron-stained quartz)

Quartz, silicon dioxide (SiO₂)

Milky quartz cluster

Quartz (silicon dioxide, SiO₂)

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Milky quartz crystal cluster

Quartz (silicon dioxide, SiO₂)

Mixed Gemstone Beaded Jewelry

Various minerals (e.g., Quartz varieties like Rose Quartz, Amethyst; Peridot; Garnet; etc.)

Mixed tumbled stones, likely rose quartz and purple quartz/amethyst

Quartz (SiO₂), including amethyst and probable rose quartz; exact identification is uncertain from the blurred image

Pink Granite

Phaneritic intrusive igneous rock with dominant Alkali Feldspar

Weathered metallic sulfide-bearing rock, possibly pyrite-rich ore

Tentatively pyrite (FeS₂) with iron oxides and host rock; exact identification requires testing

Mixed polished and tumbled mineral specimens, prominently amethyst

Amethyst: purple quartz, SiO₂; accompanying pieces may include jasper, agate, aventurine, tiger’s eye, and other lapidary stones

Tumbled yellow-brown jasper

Jasper, microcrystalline quartz (SiO₂) with iron-oxide impurities

Tumbled jasper or chalcedony pebble

Microcrystalline quartz (SiO₂), likely jasper/chalcedony with iron-oxide staining

Mixed mineral and gemstone specimens

Likely amethyst (quartz), malachite, blue calcite or dyed chalcedony, red jasper, and green aventurine/serpentine

Granite (Pink/Red Granite)

Phaneritic Felsic Igneous Rock

Quartz-rich conglomeratic sandstone

Lithic arkose/conglomerate, dominated by quartz and feldspar grains

Polished mahogany obsidian (likely) pendant

Obsidian, natural volcanic glass; compositionally rhyolitic, chiefly silica-rich glass

Tumbled hematite (likely hematite-rich ironstone)

Hematite, Fe₂O₃; possibly mixed with magnetite or goethite

Polished granite or granitic gneiss pebble

Granite; chiefly quartz, feldspar, and mica/amphibole

River Pebbles and Cobbles

Mixed Siliciclastic Sediments (Quartzite, Chert, and Sandstone clasts)

Banded Iron Formation (BIF) / Iron Ore

Hematite-Magnetite BIF (Fe2O3 / Fe3O4 mixed with SiO2)

Rounded, foliated metamorphic pebble (likely schist)

Mica schist, composition uncertain from the image

Fuchsite Schist

Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2) in Schist

Weathered conglomerate pebble

Polymictic conglomerate, likely quartz- and feldspar-rich clasts in a cemented matrix

Banded Iron Formation (Jaspilite / Hematite Jasper)

SiO2 + Fe2O3 (Quartz with Hematite/Magnetite)

Weathered, foliated metamorphic rock (likely schist)

Mica schist, composition uncertain from the photograph

Granodiorite

Granodiorite (phaneritic intrusive igneous rock)

Lapis Lazuli

Lapis Lazuli (Complex rock primarily composed of Lazurite (Na,Ca)8[(SO4,S,Cl)2|(AlSiO4)6], Calcite, and Pyrite)

Mixed polished gemstone and mineral collection

Primarily quartz varieties (SiO₂), plus probable aventurine, rose quartz, amethyst, agate, jasper, serpentine, feldspar, and possibly dyed or man-made glass pieces

Mixed tumbled stone collection

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

Rounded mixed-grain river pebble, likely granitic rock

Granite (tentative; exact rock type cannot be confirmed from the photograph)

Raw tourmaline crystal (probable schorl)

Tourmaline group; likely schorl, NaFe3+Al6(BO3)3Si6O18(OH)4