Metamorphic (Altered Igneous Rock)

Turquoise

Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Unakite

Altered Granite (Epidotized Feldspar with Quartz)

Polished brecciated jasper (likely ocean jasper or orbicular jasper)

Silica-rich chalcedony/microcrystalline quartz (SiO₂), with iron-oxide and other mineral inclusions

Tumbled Chalcedony

Quartz (Silicon Dioxide - SiO2)

Polished brecciated jasper

Jasper, microcrystalline quartz (SiO₂), with iron-oxide and pale silica-rich fragments

Banded jasper (likely red jasper with dark matrix)

Microcrystalline quartz, SiO₂, colored mainly by iron oxides; dark bands may contain manganese oxides or fine silicate minerals

Quartz with Sericite and Cinnabar

Silicon Dioxide (SiO2) with muscovite/sericite and mercury sulfide (HgS)

Probable amber fragment

Amber (fossilized plant resin; chiefly amorphous organic resin, commonly dominated by succinite)

Turquoise

Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O

Tumbled sodalite

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂; likely a sodalite-rich nepheline-syenite fragment

Likely weathered iron-rich breccia or jasper

Silicified iron-oxide breccia; exact identification requires testing

Unakite

Altered Granite (composed of pink orthoclase feldspar, green epidote, and colorless quartz)

Jasper

Microcrystalline Quartz (SiO2)

Gravel / Crushed Stone

Aggregate (mixed mineral rock fragments)

Red jasper (likely brecciated or iron-stained jasper)

Jasper, microcrystalline quartz (SiO₂), colored chiefly by iron oxides

Polished serpentine (likely bowenite)

Serpentine-group minerals, chiefly antigorite, Mg₃Si₂O₅(OH)₄; may contain magnetite and carbonate veins

Weathered basalt (possibly iron-stained volcanic rock)

Basalt; primarily plagioclase feldspar and pyroxene, commonly with olivine and iron oxides

Granite with Epidote

Granite, containing quartz, feldspar, and epidote

Likely serpentine (serpentinite) pebbles

Serpentine-group minerals, chiefly antigorite, lizardite, and/or chrysotile; commonly Mg₃Si₂O₅(OH)₄, sometimes containing magnetite, chromite, and minor carbonate minerals

Weathered mineralized rock fragment

Indeterminate; likely quartz–feldspar-rich lithic material with iron-oxide staining

Possible weathered sandstone or iron-rich sedimentary rock

Indeterminate; likely quartz-rich sandstone with iron-oxide cement

Tumbled Tiger's Eye

Silicon dioxide with crocidolite inclusions (SiO2)

Hawk's Eye / Pietersite (Tiger's Eye variant)

Pseudomorph of Quartz after Crocidolite (SiO2)

Rhyolite (possibly porphyritic and altered)

Volcanic felsic rock; primarily quartz, alkali feldspar, plagioclase, and volcanic glass, with iron-oxide alteration

Rounded granitic cobble

Granite or granitic gneiss; primarily quartz, feldspar, and mica

Unakite

Altered Granite (composed of orthoclase feldspar, epidote, and quartz)

Unakite (Granite)

Altered Granite (Orthoclase, Epidote, Quartz)

Tiger's Eye

SiO2 (Quartz with inclusions of altered crocidolite)

Turquoise

CuAl6(PO4)4(OH)8·4H2O

Unidentified weathered mineral/rock fragment

Indeterminate; likely a weathered iron-rich silicate or sulfide-bearing specimen

Nephrite Jade

Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2)

Unakite

Epidotized Granite

Quartz-veined breccia

Hydrothermal quartz–carbonate breccia; chiefly SiO₂ quartz with calcite/dolomite and altered host rock

Pyrite in Quartz Matrix

Iron Sulfide (FeS2) embedded in Silicon Dioxide (SiO2)

Fossil bivalve shell

Fossilized or partially mineralized bivalve; exact genus cannot be determined from the image

Weathered granite or granitic gneiss

Granite; primarily quartz, feldspar, and mica

Biotite Mica Schist

Metamorphic Rock containing Biotite K(Mg,Fe)3AlSi3O10(OH)2

Smoky Quartz

Silicon Dioxide (SiO2)

Iron-stained quartz vein rock

Milky quartz (SiO₂) with limonite/goethite iron oxides, possibly in altered host rock

Lapis Lazuli

Lapis Lazuli (a rock, not a single mineral; primary mineral is Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2

Charoite

(K,Sr,Ba,Ca)15-16(Na,Ca)8(Si,Al)24O60(OH,F)4 · nH2O (Hydrated silicate of potassium, calcium, and sodium)

Turquoise

CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)