Metamorphic (Altered Igneous Rock)

Unakite cabochon

Unakite: epidote–K-feldspar–quartz aggregate

Tumbled jadeite or nephrite jade bead bracelet

Jade: jadeite (NaAlSi₂O₆) or nephrite, a tremolite–actinolite amphibole aggregate

Tumbled serpentinite

Serpentinite, composed chiefly of serpentine-group minerals (lizardite, antigorite, chrysotile), commonly with magnetite and chlorite

Tumbled unakite

Unakite (epidote + pink K-feldspar + quartz)

Aventurine (Green Quartz)

Silicon dioxide with inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Rounded river pebble, likely weathered basalt or andesite

Fine-grained mafic volcanic rock; probable basalt (plagioclase + pyroxene ± olivine, altered by weathering)

Wonderstone Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Mixed Rock Collection (Pebbles and Stones)

Various geological specimens

Gneiss

Gneiss

Copper-bearing rock, likely chrysocolla–malachite with limonite

Chrysocolla (hydrated copper aluminosilicate) and malachite (Cu₂CO₃(OH)₂), with iron oxides and possible native copper

Weathered granite or granitic gneiss

Granite; primarily quartz, feldspar, and mica (exact identification is uncertain from the photograph)

Banded Gneiss

Gneiss (Metamorphic Rock)

Lapis Lazuli

Lapis lazuli (primary component: Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Garnetiferous Pegmatite

Pegmatite with Almandine Garnet and Muscovite

Turquoise

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

Blue schist (likely glaucophane schist)

Glaucophane schist; chiefly glaucophane amphibole with mica, quartz, and possible lawsonite/epidote

Fuchsite

K(Al,Cr)2(AlSi3O10)(OH)2

Weathered serpentinite (likely)

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

Amphibolite

Amphibolite

Green Opal (Prase Opal)

SiO2 · nH2O (Hydrated Silicon Dioxide)

Red-gray metamorphic pebble, likely jasper-bearing quartzite

Ferruginous quartzite/jasper; predominantly microcrystalline SiO₂ with iron oxides

Charoite

Charoite (K(Ca,Na)2Si4O10(OH,F)·H2O)

Pumice (likely)

Pumice (extrusive igneous rock)

Coarse-grained granite or granitic gneiss

Granite; mainly quartz (SiO₂), feldspar, and mica; possible gneissic deformation

Weathered granite (feldspathic, iron-stained granite)

Granite; primarily quartz, potassium feldspar, plagioclase feldspar, and minor mica/amphibole. Exact identification is uncertain from a single photograph.

Red-and-green jasper

Jasper, microcrystalline quartz (SiO₂), colored mainly by iron oxides and possibly chlorite/epidote

Schist

Schist (metamorphic rock)

Unakite

Epidote-Feldspar rock

Unakite

Metamorphosed Granite (Epidotized Feldspar and Quartz)

Quartz Heart or Arrowhead Shape

Silicon Dioxide (SiO2)

Tumbled jasper pebble

Microcrystalline quartz (SiO₂), commonly with iron-oxide inclusions

Weathered iron-rich quartzite or ironstone cobble

Quartzite, likely limonite/goethite-stained (SiO₂ with FeO(OH)·nH₂O)

Tumbled black-and-white stone, likely dalmatian jasper

Quartz-rich porphyritic rhyolite (commercially called dalmatian jasper), with black aegirine/arfvedsonite-like inclusions

Rough Apatite in Matrix

Fluorapatite / Chlorapatite / Hydroxylapatite (Ca5(PO4)3(F,Cl,OH))

Polished tiger iron (likely)

Tiger iron: banded quartzite composed mainly of quartz, hematite, and crocidolite/amphibole; visual identification is provisional

Unakite

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

Clear Quartz (Faceted Crystal)

Silicon Dioxide (SiO2)

Unidentified dark reddish-brown rock or mineral specimen

Indeterminate from the blurred image; possibly iron-stained quartz, jasper, or a metallic sulfide-bearing rock

Agate

SiO2 (Chalcedony/Quartz)

Yellow-green jasper or serpentine-rich rock

Likely microcrystalline quartz (SiO₂) with iron-bearing and/or serpentine minerals; exact identification requires testing

Dzi Bead (Agate)

Chalcedony (cryptocrystalline variety of Quartz), SiO2

Hypersthene

Hypersthene ((Mg,Fe)SiO₃)