Metamorphic Or Sedimentary Depending On Local Grade

Likely tumbled greenstone (identity uncertain)

Greenstone: metamorphosed mafic volcanic rock, commonly composed of chlorite, actinolite, and epidote

Amphibolite

Hornblende–plagioclase amphibolite

Likely slate fragment

Slate; fine-grained foliated metamorphic rock composed mainly of clay minerals, quartz, and mica

Weathered gray metamorphic rock, likely phyllite or slate

Micaceous quartz–phyllosilicate rock; commonly quartz + muscovite/illite ± chlorite

Quartz crystal cluster

Quartz (silicon dioxide, SiO₂), likely milky or included quartz

Copper-Bearing Sulfide Ore (likely Chalcopyrite or Bornite)

Chalcopyrite (CuFeS2) or Bornite (Cu5FeS4) in host rock

Blue cabochon gemstone, likely synthetic glass or dyed stone

Indeterminate from image; possible glass, synthetic spinel, sodalite, or lapis lazuli

Gneiss

High-grade Metamorphic Gneiss

Greenstone or Chlorite Schist

Greenschist / Chlorite schist

Pebbles

Polymictic rock fragments

Tumbled greenstone pebble

Greenstone (metamorphosed mafic volcanic rock; commonly chlorite, actinolite, epidote, and albite)

Weathered quartz-rich rock, likely granite or granitic gneiss

Granite–gneiss assemblage; mainly quartz (SiO₂), feldspar, and minor mica/amphibole

Emerald In Matrix

Beryl (Be3Al2Si6O18) with trace Chromium/Vanadium

Quartzite pebble (likely)

Quartzite; predominantly microcrystalline quartz (SiO₂)

Charoite

Charoite (K(Ca,Na)2Si4O10(OH,F)·H2O)

Libyan Desert Glass

Libyan Desert Glass (SiO2 with trace elements)

Kyanite (Blue and Green varieties)

Kyanite (Al₂SiO₅)

Pale greenish-yellow spodumene crystal (likely hiddenite or kunzite-family material)

Spodumene, LiAlSi₂O₆

Sugilite

KNa2(Fe,Mn,Al)2Li3Si12O30

Fine-grained dark metamorphic rock, likely slate or phyllite

Slate/phyllite; chiefly quartz, mica, and chlorite

Likely raw garnet crystal

Garnet-group silicate, probably almandine (Fe₃Al₂Si₃O₁₂)

Bivalve Fossil (Clam/Mollusk)

Class: Bivalvia (Order: Veneroida), Calcium Carbonate (CaCO3)

Libyan Desert Glass

Libyan Desert Glass (Impactite)

Libyan Desert Glass

Natural Silica Glass (SiO2 with minor iron and titanium)

Almandine Garnet

Fe3Al2(SiO4)3

Sandstone

Arenite

Green Slag Glass

Amorphous Silica Glass (Anthropogenic)

Amphibolite

Amphibolite, composed mainly of amphibole and plagioclase feldspar

Blue-gray foliated metamorphic rock, likely slate or phyllite

Slate (fine-grained metamorphosed shale), possibly phyllite; mineral proportions cannot be confirmed from the image

Quartz-mica schist (likely garnet-bearing)

Schist dominated by quartz and mica; possible biotite/muscovite and garnet

Garnet crystals

Garnet-group silicates, likely almandine (Fe₃Al₂Si₃O₁₂)

Slate

Slate, a fine-grained metamorphic rock composed mainly of mica-group minerals and quartz

Landscaping stones

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

Milky quartz

Quartz (silicon dioxide, SiO₂)

Iron-stained quartz-bearing rock, possibly weathered granite or gneiss

Quartz–feldspar rock with iron-oxide staining; exact identification requires testing

Gneiss

Gneiss (High-grade metamorphic rock)

Likely red jasper or iron-rich chert fragments

Microcrystalline quartz (SiO₂), colored by hematite/goethite; exact identification requires testing

Gold Ore in Quartz/Schist

Auriferous Quartz and Sulfide-bearing Schist

Shale or Slate

Shale (Sedimentary) or Slate (Metamorphic)

Gneiss with Quartz Veining

Gneiss (High-grade Regional Metamorphic Rock)

Schist

Mica Schist

Red jasper (likely tumbled or naturally worn)

Jasper, microcrystalline quartz/chalcedony (SiO₂), colored mainly by iron oxides