Organic Material (Likely A Fruit Or Berry)

Tumbled serpentinite (likely antigorite-rich serpentine)

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnetite, chromite, or brucite

Greenstone, likely serpentinite

Serpentinite; predominantly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), possibly with chlorite, talc, magnetite, or antigorite

Tumbled carnelian (likely)

Orange-red chalcedony, microcrystalline quartz (SiO₂)

Fossil Shell (Bivalve)

Class Bivalvia (Likely a member of the Ostreidae or Gryphaeidae family), CaCO3

Sandstone (likely Quartzite-rich)

Arenite (primarily SiO2)

Sandstone (likely Quartzose Sandstone)

Arenite

Sandstone with Quartz Vein

Arenite with Quartz (SiO2) protrusion

Garnet-bearing metamorphic rock, likely mica schist

Biotite–garnet schist; commonly includes quartz, feldspar, biotite, and almandine garnet

Tumbled green-and-white stone, likely serpentine

Serpentinite; mainly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnesite or talc

Likely weathered gray-green stone, possibly serpentinite

Serpentinite (predominantly serpentine-group minerals; identification uncertain from image)

Dark vesicular volcanic rock, likely basaltic scoria

Scoria (vesicular basalt; composition commonly plagioclase, pyroxene, and iron-rich glass)

Weathered iron-rich sandstone or laterite

Ferruginous sandstone; chiefly quartz (SiO₂) cemented or stained by iron oxides such as hematite and goethite

Weathered greenstone (likely serpentinite or altered basalt)

Serpentinite-group rock, commonly dominated by serpentine minerals (antigorite/lizardite); exact identification requires testing

Likely rose quartz-bearing pegmatite

Quartz (SiO₂), probably with feldspar and iron-oxide staining

Porphyritic Basalt (or Andesite) containing Augite

Porphyritic Mafic Volcanic Rock

Weathered granite or granitic gneiss

Granite: quartz, feldspar, and mica; possibly gneiss if the dark minerals are banded

Turquoise, Pearl, and Coral Necklace

CuAl6(PO4)4(OH)8·4H2O (Turquoise) / CaCO3 (Pearl and Coral)

Chert / Flint

Chert (varietal name for microcrystalline quartz). Chemical formula: SiO₂

Tumbled blue-green stone, likely chrysocolla-bearing jasper

Chrysocolla-rich chalcedony/jasper; commonly a mixture of chrysocolla (hydrated copper silicate, variable formula) and quartz (SiO₂)

Green copper-mineral specimen, likely chrysocolla or copper-bearing serpentine

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

Yellow chalcedony (likely lemon quartz or citrine)

Cryptocrystalline silica, SiO₂; possible quartz variety

Orbicular jasper (likely ocean jasper)

Silica-rich microcrystalline quartz/chalcedony with iron-oxide and other mineral inclusions; commonly classified as orbicular jasper

Rough Agate/Chert Nodules

Cryptocrystalline Quartz (SiO2)

Granite (Weathered)

Phaneritic Plutonic Rock (primarily Quartz, Feldspar, and Mica)

Chert (Flint)

Chert (Silicon Dioxide, SiO2)

Chert (often called Flint)

Chert (SiO2)

Tumbled pegmatitic granite

Granite, chiefly quartz–feldspar–mica; likely altered pegmatite

Green aventurine cabochon (likely)

Quartzite/aventurine quartz, predominantly SiO₂ with possible fuchsite mica

Likely granite or granitic gneiss

Quartz–feldspar–mica aggregate; possibly foliated granitic gneiss

Foliated metamorphic rock, likely biotite schist

Mica schist, chiefly quartz, feldspar, and biotite mica

Serpentinite (likely brecciated serpentinite)

Serpentinite; primarily serpentine-group minerals (antigorite, lizardite, chrysotile), commonly with magnetite, brucite, and relict olivine/pyroxene

Chert (Brown Variety)

Silicon dioxide (SiO2)

Tumbled epidote or epidote-rich stone

Epidote, Ca₂(Al,Fe)₃(SiO₄)₃(OH); possibly a green jasper or prehnite-epidote aggregate

Chert (variations include Flint or Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Tumbled dark banded stone, possibly indigo gabbro or banded basalt

Indeterminate; likely fine-grained mafic rock composed mainly of plagioclase and pyroxene, with possible amphibole or alteration minerals

Chert (Arrowhead/Tool variety)

Microcrystalline Quartz (SiO2)

Likely vertebra fossil or bone fragment

Indeterminate fossilized vertebra; mineralized hydroxyapatite, commonly Ca₅(PO₄)₃(OH)

Tumbled green-and-white stone, likely serpentine

Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, or chrysotile), commonly with magnetite and carbonate veins

Quartz Pebble

Silicon Dioxide (SiO2)

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Granite Cobble

Granite (Phaneritic igneous rock composed of Quartz, Feldspar, and Mica)

Tumbled quartz-rich pebble, possibly quartzite

Quartzite (mostly SiO₂), or quartz-bearing chert; exact identification requires testing