Mineralogical Simulant

Small tumbled blue-green stone, possibly chrysocolla or turquoise

Indeterminate copper-bearing mineral; possible chrysocolla (Cu₂H₂Si₂O₅(OH)₄·nH₂O) or turquoise (CuAl₆(PO₄)₄(OH)₈·4H₂O)

Diamond (or Cubic Zirconia simulant)

Carbon (C) or Zirconium Dioxide (ZrO2)

Blue glass-like gemstone, likely synthetic spinel or glass

Uncertain; possibilities include synthetic cobalt-blue spinel (MgAl₂O₄) or cobalt-colored glass

Red gemstone ring, likely ruby or synthetic ruby

Corundum (Al₂O₃), chromium-colored; natural versus synthetic cannot be determined from the photo

Cubic Zirconia (Diamond Simulant)

Zirconium Dioxide (ZrO2)

Mixed River Pebbles

Clastic Sedimentary Alluvial Deposit / Polymictic Conglomerate Clasts

Moonstone cabochon ring

Adularia moonstone, potassium feldspar (orthoclase, KAlSi₃O₈), possibly imitation or another white translucent gemstone

Rounded greenstone cobble

Likely greenschist or altered basalt; composition commonly chlorite, epidote, actinolite, albite, and quartz

Unakite (likely, rough specimen)

Epidote–feldspar–quartz rock; commonly approximated as pink orthoclase + green epidote + quartz

Yellow serpentine (likely lemon chrysoprase/serpentine breccia)

Serpentine-group minerals, chiefly antigorite/lizardite; commonly mixed with magnesite and iron oxides

Dark gray fine-grained rock, likely basalt

Basalt; chiefly plagioclase feldspar and pyroxene, often with minor olivine and magnetite

Weathered iron-rich rock (probable laterite or limonite-bearing stone)

Goethite–limonite mixture, commonly written FeO(OH)·nH₂O, with possible quartz and clay minerals

Biotite-rich schist

Mica schist; predominantly biotite mica with quartz and feldspar

Tumbled yellow-green stone, likely serpentine

Serpentine-group minerals, commonly antigorite/lizardite (Mg₃Si₂O₅(OH)₄)

Gossan with Copper Carbonate (Chrysocolla/Malachite)

Ferruginous Oxide (Gossan) with Cu2CO3(OH)2 (Malachite) or (Cu,Al)2H2Si2O5(OH)4 (Chrysocolla)

Tumbled greenstone (probable serpentinite)

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

Tumbled green-brown stone, likely serpentine

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

Tiny rounded brown mineral grain

Indeterminate; possibly iron oxide, garnet, or a weathered sulfide grain

Veined metamorphic cobble, likely serpentinite

Serpentinite, commonly dominated by antigorite/lizardite with magnetite and cross-cutting quartz or calcite veins

Blue-gray tumbled stone, likely labradorite or blue-gray feldspar

Plagioclase feldspar, possibly labradorite (NaAlSi₃O₈–CaAl₂Si₂O₈)

Iron-rich laterite or weathered ironstone pebble

Goethite–hematite-rich ferruginous duricrust; commonly approximated as FeO(OH) and Fe₂O₃

Weathered greenstone (metabasalt)

Chlorite–actinolite metabasalt; composition varies, commonly plagioclase with chlorite, actinolite, epidote, and amphibole

Cut gemstone, likely diamond

Diamond (crystalline carbon, C)

Serpentine

Serpentinite (group of hydrous magnesium iron phyllosilicate minerals)

Small polished pebble, likely quartz or quartzite

Undetermined; possibly quartzite (quartz, SiO₂)

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Reddish-brown crystalline rock, possibly weathered granite or garnet-bearing schist

Indeterminate; likely quartz–feldspar–mica rock with iron oxides, potentially garnet-bearing

Greenstone / River Jadeite pebble

Metavolcanic rock / Chlorite or Actinolite-rich schist

Cut gemstone ring, likely diamond

Diamond (carbon, C), faceted gemstone; exact stone identification is uncertain from the image

Gemstone ring (stones not reliably identifiable from the image)

Likely faceted yellow stones and clear stones set in a metal band; species and treatments are indeterminate visually

Diamond

Carbon (C)

Black tourmaline (schorl)

Schorl, NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

Osumilite in Granite Matrix

(K,Na)(Fe,Mg)2(Al,Fe)3(Si,Al)12O30

Granite Cobble

Plutonic Granite

Brecciated jasper with quartz vein

Jasper (microcrystalline quartz, SiO₂) with quartz/chalcedony cement; brecciated silica-rich rock

Tumbled brown chert or flint

Microcrystalline quartz (SiO₂), commonly with chalcedony

Painted Garden Rock

Coated Siltstone or Mudstone

Tumbled chert or flint pebble

Microcrystalline quartz (SiO₂), likely chert

Fossilized bivalve shell

Fossil mollusk, likely an oyster or similar bivalve; original shell composed of calcium carbonate (aragonite/calcite)

Polished brown flint/chert nodule

Microcrystalline quartz (SiO₂), commonly called flint or chert

Weathered iron-rich volcanic rock

Likely altered basalt or andesite with iron-oxide staining

Sandstone Concretion

Ferruginous Sandstone Concretion (Primarily SiO2 with Iron Oxide cement)