Mixed (Sedimentary, Igneous, And Metamorphic)

Quartz-rich rock, possibly milky quartz or quartzite

Quartz (SiO₂); if quartzite, recrystallized quartz sandstone

Likely quartz-rich stone (possibly milky quartz or quartzite)

Quartz, silicon dioxide (SiO₂), or quartzite if interlocking grains are present

Pink Granite (Crystalline Granite)

Igneous Intrusive Rock (Felsic Plutonic)

Botryoidal chalcedony (possibly agate/geode material)

Chalcedony, microcrystalline quartz (SiO₂)

Polished pink-and-gray stone, likely rhodonite

Rhodonite (manganese inosilicate, MnSiO₃), possibly mixed with quartz or feldspar

Raw tourmaline crystal (probable schorl)

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

Tiger’s eye

Quartz (SiO₂) with fibrous crocidolite pseudomorphs and iron oxides

Jasper and Basalt (Mixed Breccia or Chert)

Silicon Dioxide (SiO2) with Ferromagnesian silicates

Iron-rich concretion (likely limonite/goethite)

Limonite–goethite aggregate; commonly hydrated iron oxides, approximately FeO(OH)·nH₂O

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Quartz (Engineered Stone Countertop)

Silicon Dioxide (SiO2) with polymer resins

Hematite

Iron Oxide (Fe2O3)

Quartz pebble

Silicon dioxide (SiO2)

Blue Apatite

Apatite (Ca5(PO4)3(F,Cl,OH))

Green Aventurine

SiO2

Mixed rock and mineral collection

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

Milky Quartz

Quartz (SiO2)

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)

Quartz-rich conglomeratic sandstone

Lithic arkose/conglomerate, dominated by quartz and feldspar grains

Paving-concrete aggregate with a rounded stone

Polymictic gravel aggregate; the central clast appears to be weathered sandstone or volcanic rock

Polished granite or granitic gneiss pebble

Granite; chiefly quartz, feldspar, and mica/amphibole

Mixed gemstone bead bracelet, likely lava rock and aventurine/jade-look beads

Basaltic scoria (vesicular basalt), plus probable serpentine, aventurine, or dyed quartzite beads

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Pink Granite

Phaneritic intrusive igneous rock with dominant Alkali Feldspar

Serpentinite (likely serpentinized ultramafic rock)

Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), with possible magnetite, olivine, pyroxene, and talc

Magnetite

Magnetite (Fe3O4)

Pyrite

Iron Sulfide (FeS2)

Polished agate or jasper cabochon

Cryptocrystalline quartz, SiO₂, possibly iron-rich jasper inclusions

Mixed gravel and small stones

Unsorted gravel; individual clasts are not identifiable 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

Quartz (Rose Quartz or Jasper variety)

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Tumbled chert or flint

Microcrystalline quartz (SiO₂), commonly chalcedony with possible iron-oxide inclusions

Zoisite with Ruby (Anyolite)

Zoisite – Ca2Al3(SiO4)3(OH) with inclusions of Ruby (Al2O3:Cr)

Likely galena-bearing ore

Galena (lead sulfide, PbS), possibly mixed with sulfide minerals

Pyrite

Iron Sulfide (FeS2)

Tumbled tiger’s-eye-rich metamorphic stone

Tiger’s eye: fibrous quartz (SiO₂), commonly intergrown with crocidolite pseudomorphs; possibly mixed with dark iron-rich matrix

Iron-rich sandstone or ferruginous conglomeratic sandstone

Ferruginous sandstone, primarily quartz (SiO₂) cemented or stained by iron oxides/hydroxides

Blue Apatite

Fluorapatite (Ca5(PO4)3F)