Mixed

Mixed limestone and sandstone specimens

Mostly calcitic limestone (CaCO₃), with possible quartz-rich sandstone and iron-oxide staining

Mixed mineral and rock specimen collection with an obsidian-like centerpiece

Likely black obsidian (volcanic glass), alongside quartz, amethyst, agate/jasper, and other tumbled minerals

Mixed rock and mineral specimen collection

Varied silicate, carbonate, and oxide minerals; individual identification is not possible from this group photograph

Mixed landscaping gravel and mineral specimens

Mixed silicate and carbonate rocks; likely quartz, chert, jasper, basalt, granite, and limestone

Mixed rounded rock pebbles

Likely granitic gneiss, basaltic rock, and quartz-rich granitic material; exact identification is uncertain from the image

Mixed gravelly conglomeratic road aggregate

Polymictic clast-supported conglomerate or fill; composition varies, commonly quartz, feldspar, basalt, and weathered rock fragments

Mixed mineral and rock specimen collection

Assorted silicates, carbonates, oxides, and sulfides; individual species cannot be reliably identified from this image

Mixed sandstone and iron-rich sedimentary rock fragments

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

Mixed river gravel, prominently iron-stained chert/jasper

Microcrystalline quartz (SiO₂), chiefly chert/jasper with iron-oxide staining; mixed clasts may include quartzite and other silicates

Mixed River Stones and Minerals

Mixed Silica-rich Stones (Quartz, Agate, Jasper, Sandstone, Dalmation Stone)

Mixed Mineral Collection (with Titanium Aura Quartz)

Silicon Dioxide (SiO2) with metallic coatings and various silicates

Mixed Gemstone and Mineral Collection

Silicon Dioxide (SiO2) based minerals and others

Jasper and Mixed River Pebbles

Microcrystalline Quartz (Chalcedony / Jasper)

Mixed Mineral Assortment (Pyrite, Kyanite, Agate, Jasper)

FeS2 (Pyrite), Al2SiO5 (Kyanite), SiO2 (Agate/Jasper)

Sandstone and Mixed Rock Assemblage

Clastic Sedimentary Rock / Quartz Arenite

Petrified Wood and Mixed Rocks

Silicified Wood (SiO2)

Mixed gemstone jewelry collection

Various gemstone minerals, including likely amethyst (quartz), sapphire or iolite, garnet, pearl, turquoise, and colored beryl or tourmaline

Mixed rock and mineral specimen collection

Mostly undetermined from the photograph; apparent quartz-rich rocks, sandstone, granite/gneiss, and possibly iron-oxide-bearing specimens

Mixed rounded fieldstones, likely granite and gneiss

Granite (quartz–feldspar–mica) and gneiss; exact identification is uncertain from the photograph

Mixed polished river stones

Likely quartz, quartzite, chert/jasper, and possibly limestone or marble

Mixed rock and mineral gravel

Predominantly granite/granodiorite, basaltic rocks, quartz, and possible gneiss; exact identification is uncertain from the image

Mixed pebble collection, including likely flint, quartzite, and fossil material

Varied silicate rocks; visible specimen may include chert (microcrystalline SiO₂), quartzite, and a possible fossil

Mixed rock and mineral specimen collection

Multiple species, likely quartz (SiO₂), calcite (CaCO₃), feldspar, chert, and assorted volcanic/sedimentary rocks

Mixed tumbled gemstone collection

Varied minerals, likely including amethyst, sodalite/lapis lazuli, quartzite or aventurine, jasper, and agate/chalcedony

Granite and Mixed Landscape Gravel

Plutonic Igneous Rock / Weathered Alluvium

Mixed Pebbles and Shell Fragments

Polylithic sedimentary aggregate and biogenic calcium carbonate

Mixed Mineral and Crystal Assortment

Various silicate and oxide minerals

Mixed Quartz and Mineral Gravel

Silicon Dioxide (SiO2) and assorted silicate minerals

Mixed gravel and stone fragments

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

Mixed mineral and rock specimens

Unidentified assortment; visible pieces may include rose quartz, green aventurine, quartz, and a gray crystalline rock, but the image is insufficient for exact identification.

Mixed collection of polished geological specimens; central specimen is likely diorite

Diorite (probable; plagioclase feldspar and dark amphibole/biotite)

Mixed mineral specimens, prominently chalcopyrite and amethyst

Chalcopyrite (CuFeS₂) with secondary copper minerals; amethyst, purple quartz (SiO₂)

Mixed rock and mineral collection

Unidentified assortment of geological specimens; individual species 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 mineral and gemstone specimens

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

Amethyst and mixed gemstone bracelet

Amethyst: purple quartz, silicon dioxide (SiO₂); likely accompanied by other quartz or decorative mineral beads

Mixed garnet crystal specimens

Garnet-group silicates, likely almandine–spessartine with possible grossular/pyrope varieties; general formula X₃Y₂(SiO₄)₃

Mixed collection of tumbled minerals and rough specimens

Multiple species visible; likely fluorite, quartz/chalcedony, pyrite, tiger’s eye, rose quartz, and possibly labradorite or agate

Mixed Mineral Bead Bracelet

Polycrystalline and Monocrystalline Silicates/Oxides (Quartz, Howlite, Hematite)

Mixed Quartz and Aventurine Chips

Silicon Dioxide (SiO2) with various inclusions

Mixed quartz specimens, including amethyst

Quartz (SiO₂), with purple amethyst variety; possible milky or included quartz