Mixed (Sedimentary, Igneous, And Metamorphic)

River Pebble

Polished Quartzite or Mixed Lithology

Polished amethyst bead fragments

Amethyst, purple quartz (SiO₂)

Pyrite

Iron Sulfide (FeS2)

Granite

Granite (Plutonic Igneous Rock)

Pink Granite

Phaneritic Felsic Igneous Rock

Tumbled green jasper (probable serpentine-rich stone)

Jasper, microcrystalline quartz (SiO₂), possibly mixed with serpentine or chlorite

Weathered quartz-rich pebble, possibly quartzite or granite fragment

Quartzite (mostly SiO₂), though the specimen may contain feldspar and other silicates

Jasper and Quartz

Silicon Dioxide (SiO2)

Asphalt Concrete

Bituminous conglomerate

Dalmatian Stone (Dalmatian Jasper)

Peralkaline Quartz-Feldspar Porphyry with Arfvedsonite

Mixed rounded fieldstones, likely granite and gneiss

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

Polymictic conglomerate or breccia (possibly concrete-like aggregate)

Lithified polymictic gravel; clasts may include basalt, granite, quartzite, and other silicates

Iron-rich concretion or weathered ironstone

Goethite–hematite-rich limonite (FeO(OH)·nH₂O / Fe₂O₃)

Rounded river gravel (mixed alluvial pebbles)

Polymictic alluvial gravel; commonly composed of quartzite, granite, basalt, sandstone, and quartz

Fulgarite

Fulgurite (Lechatelierite / Vitrified Sand)

Fuchsite

Chromium-rich Muscovite Mica

Magnetite sand (black iron-oxide sand)

Magnetite, Fe₃O₄; commonly mixed with ilmenite and other heavy minerals

Pyrite-bearing sulfide ore (likely pyrite with iron oxides)

Pyrite, FeS₂, possibly mixed with limonite/goethite and other sulfides

Granite fragment

Granite; predominantly quartz (SiO₂), feldspar, and mica

Black Tourmaline

Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)

Tourmaline (Mixed colors)

Boron silicate mineral (Na,Ca)(Li,Mg,Al,Fe,Mn,Ti,V,Cr)3Al6(BO3)3Si6O18(OH,F)4

Lapis lazuli bead bracelet

Lazurite-bearing calcite–pyrite rock; lazurite formula (Na,Ca)₈(AlSiO₄)₆(S,SO)₂

Coarse-grained granite

Granite, composed chiefly of quartz, potassium feldspar, plagioclase, and biotite/hornblende

Pink Granite

Phaneritic Plutonic Felsic Igneous Rock (Granite)

Green Spot Jasper (Kiwi Jasper / Sesame Jasper)

Partially altered granitic rock rich in quartz, microcline feldspar, and tourmaline or amphibole inclusions

Mica-bearing metamorphic rock, likely schist

Muscovite–biotite schist, possibly phyllite

Unakite

Epidotized Granite

Weathered granitic gneiss (probable)

Gneiss, chiefly quartz–feldspar–biotite; compositionally granitic

Pink Granite

Phaneritic intrusive igneous rock (Granite)

Pink Granite

Phaneritic intrusive igneous rock (Granite)

Yellow Ochre (Limonite)

Limonite (FeO(OH)qnH2O)

Lapis Lazuli

Lapis Lazuli (Rock containing lazurite, calcite, and pyrite)

Mookaite Jasper

Silicified Radiolarite (SiO2 with iron impurities)

Concrete rubble

Anthropogenic conglomerate

Pink Granite (Gneissic Granite)

Granite (composed primarily of Quartz, K-Feldspar, and Plagioclase)

Granodiorite

Granodiorite (containing Plagioclase, Quartz, K-Feldspar, and Hornblende or Biotite)

Pink Granite

Granite (rich in Potassium Feldspar/Orthoclase)

Jasper / Agate with Petrified Wood Inclusion

SiO2

Jasper containing Agate (Jaspagate)

Silicon Dioxide (SiO2)

Polymictic conglomerate

Clast-supported conglomerate, typically quartz- and feldspar-rich in a dark matrix

Puddingstone

Conglomerate

Natural gemstone and mineral collection

Mixed specimens, including turquoise, tiger’s eye, amethyst, fluorite, pyrite, garnet, rose quartz, lapis lazuli, obsidian, rhodonite, red corundum, labradorite, calcite, lepidolite, sodalite, apatite, and others