Mixed

Gold dust/flakes with black sand

Gold (Au) mixed with Magnetite/Hematite

Mixed Mineral Collection (Quartz, Amethyst, Rose Quartz, Pyrite, etc.)

Mixed Silicates and Sulfides (SiO2, FeS2)

Mossy Rock

Mixed lithology rock with Bryophyta (moss)

Migmatite

Migmatite (Mixed metamorphic-igneous rock)

Silver (Sterling Silver Jewelry)

Argentum (Ag) mixed with Copper (Cu)

Fossiliferous limestone with silicified fossil material

Bioclastic limestone; likely marine mollusk/coral fragments, locally replaced by chalcedony or calcite

Pebble with dark mineral inclusion

Likely granitic or gneissic quartz–feldspar pebble with a mafic inclusion; exact identification requires testing

Kaolin (China Clay)

Kaolinite [Al2Si2O5(OH)4]

Quartz-rich metamorphic rock, likely mica schist

Mica schist; chiefly quartz (SiO₂) and mica, likely muscovite/biotite, with possible feldspar

Lapis lazuli bead bracelet

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

Fancy Jasper

Silicon Dioxide (SiO2) with iron and organic inclusions

K-feldspar Granite / Red Granite Fragment

Alkali feldspar granite (Plutonic igneous rock)

Pink Granite

Phaneritic Felsic Igneous Rock (Granite)

Unakite

Epidotized Granite

Asphalt aggregate

Human-made bituminous asphalt containing crushed silicate rock aggregate

Mixed small pebbles and mineral grains

Unidentified detrital sediment; likely quartz-, feldspar-, and lithic fragments

Tumbled granite or granitic gneiss

Granite/granitic gneiss, chiefly quartz, feldspar, and dark mica or amphibole

Iron-rich concretion or weathered limonite/goethite nodule

Limonite (hydrous iron oxides), commonly dominated by goethite (FeO(OH))

Asphalt aggregate pavement

Bituminous asphalt concrete containing crushed stone aggregate

Asphalt Conglomerate

Artificial Bituminous Conglomerate

Pink Granite

Phaneritic Felsic Igneous Rock (Rich in K-Feldspar)

Jasper with Quartz

Silicon Dioxide (SiO2) - Chalcedony variety

Concrete with Exposed Aggregate

Anthropogenic conglomerate (Concrete)

Polished blue-green stone, likely chrysocolla or chrysocolla-bearing chalcedony

Chrysocolla: hydrated copper phyllosilicate, approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O; exact identification requires testing

Unakite

Unakite (Epidotized Granite)

Unakite

Epidotized Granite

Quartz with Iron Staining

Silicon Dioxide (SiO2) with Hematite/Limonite inclusions

Granite (Pink/Potassium Feldspar rich)

Granite (K-feldspar rich intrusive igneous rock)

Agate (Lake Superior Agate variant)

Chalcedony / Silicon Dioxide (SiO2)

Rounded granitic pebble (likely granite or granodiorite)

Granite–granodiorite; chiefly quartz, feldspar, and mica/amphibole

Conglomerate

Polymictic conglomerate, likely carbonate-cemented

Mixed polished gemstone bead bracelet, likely ocean jasper, agate, and quartz varieties

Mostly microcrystalline quartz (SiO₂), with possible chalcedony, jasper, and minor feldspar or other inclusions

Weathered granitic gneiss (probable)

Gneiss, chiefly quartz–feldspar–biotite; compositionally granitic

Tumbled yellow-brown quartzite or jasper

Quartzite, predominantly microcrystalline quartz (SiO₂), possibly iron-stained jasper

Chrysocolla

Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4·nH2O

Chalcedony Agate / Carnelian nodules in Matrix

SiO2 (Silicon Dioxide) with iron oxide inclusions

Chrysocolla on Matrix

Hydrated copper phyllosilicate (Cu,Al)2H2Si2O5(OH)4·nH2O

Unakite

Unakite (Epidotized Granite)

Chrysocolla on Matrix

Hydrated copper silicates ((Cu,Al)2H2Si2O5(OH)4·nH2O)

Polymictic conglomerate

Conglomerate; clast-supported polymictic conglomerate in a dark matrix

Quartz-rich feldspar rock, possibly pegmatitic granite

Granite or granitic pegmatite; mainly quartz (SiO₂) and feldspar, with possible mica

Garnet

Garnet-group silicate, likely almandine–spessartine; general formula X₃Y₂(SiO₄)₃