Mixed

Azurite Malachite (Mixed)

Azurite-Malachite; Azurite: Cu3(CO3)2(OH)2 / Malachite: Cu2CO3(OH)2

Tumbled carnelian (orange chalcedony)

Chalcedony, microcrystalline quartz (SiO₂), colored by iron oxides

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

Azurite–malachite-bearing quartz or chalcedony

Cu₃(CO₃)₂(OH)₂ azurite with Cu₂CO₃(OH)₂ malachite in SiO₂-rich matrix

Rounded river pebble

Likely lithic sandstone or weathered quartz-rich rock; exact identification requires testing

Mixed rock and mineral collection

Mixed lithologies; likely quartz, feldspar, basalt, granite, chert, sandstone, and metamorphic rocks

Conglomeratic breccia

Clast-supported polymictic conglomerate/breccia, cemented by silica- or carbonate-rich matrix

Polished brown jasper

Jasper (microcrystalline quartz, SiO₂), likely iron-oxide-rich variety

Mixed river gravel (alluvial conglomeratic sediment)

Polymictic alluvium; composition includes quartz, feldspar, chert, granite, basalt, and metamorphic rock fragments

Bauxite

Aluminium ore (Hydrated aluminium oxides AlOx(OH)3-2x)

Jasper and Quartz Breccia

Silica breccia (SiO2)

Sandstone with Desert Varnish

Arenite with Ferromanganese patina

Mixed gemstone bead strand, likely including agate, quartz, turquoise, and sandstone beads

Varied silicate and copper-mineral materials; exact bead identities cannot be confirmed visually

Landscaping stones

Unidentified natural fieldstones, possibly granite, gneiss, quartzite, and limestone

Blue glassy fragment among beach gravel

Likely cobalt-blue man-made glass; not a natural mineral specimen

Fossiliferous Shale Matrix

Clastic Sedimentary Rock with Brachiopod or Mollusk shell fragments

Asphalt (Bituminous pavement)

Bituminous concrete / Asphalt

Likely biotite-rich schist

Mica schist, probably containing biotite and quartz (exact identification requires testing)

Amethyst bead bracelet

Quartz, SiO₂; purple variety colored mainly by iron-related defects and irradiation

River gravel and cobbles

Mixed alluvial clasts, likely including granite, basalt, quartzite, and sandstone

Unakite

Unakite (metamorphosed granite)

Lepidolite in Quartz

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 / SiO2

Purple Lepidolite with Quartz

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

Azurite-Malachite with Limonite

Cu3(CO3)2(OH)2 (Azurite) / Cu2CO3(OH)2 (Malachite)

Chrysocolla in Cuprite / Mixed Copper Ore

Hydrated copper silicate and copper(I) oxide, (Cu,Al)2H2Si2O5(OH)4·nH2O and Cu2O

Rounded river pebbles, likely basalt and sandstone/conglomerate

Probable basalt (dark specimen) and ferruginous sandstone or weathered conglomerate (tan specimen)

Granite

Coarse-grained felsic plutonic rock, chiefly quartz, potassium feldspar, plagioclase, and biotite/hornblende

Granite

Granitic plutonic rock, chiefly quartz, alkali feldspar, plagioclase, and mica/amphibole

Tumbled pink granite

Granite, primarily quartz, feldspar, and mica; likely pink alkali-feldspar granite

Unakite

Unakite Epidosite (composite of Epidote, Orthoclase, and Quartz)

Granite Pebble

Granite (composed primarily of Quartz, Potassium Feldspar, Plagioclase, and Biotite/Amphibole)

Chrysocolla

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

Granite Pebble

Intrusive Igneous Rock (Quartz, Feldspar, Mica)

Pink Granite

Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Mica)

Granodiorite (Weathered)

Granodiorite

Granodiorite (containing Biotite and Quartz)

Granodiorite (Plagioclase-rich phaneritic intrusive rock)

Conglomerate (possibly breccia/conglomeratic rock)

Polymictic conglomerate; composition and exact classification are uncertain from the image

Turquoise

Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O

Tumbled jasper (likely yellow/brecciated jasper)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide and clay inclusions

Tumbled purple-blue corundum, possibly sapphire

Corundum (Al₂O₃); blue-to-purple varieties are sapphire