Metamorphic (Likely Gneiss Or Schist Based On Texture)

Polished dark green stone, likely nephrite jade or serpentine

Nephrite jade: tremolite–actinolite amphibole, Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂; possible serpentine: Mg₃Si₂O₅(OH)₄

Greenish Feldspathic Rock / Epidote Granite (Unakite-type or Epidote-bearing rock)

Epidotized Metamorphic/Igneous Rock

Orange cabochon gemstone, likely amber or amber-like resin

Natural amber: fossilized plant resin (organic mineraloid), commonly succinite; exact identification requires testing

Garnet-bearing gneiss

Quartz–feldspar–mica gneiss with iron-rich garnet (commonly almandine)

Likely weathered basalt or basaltic rock

Basalt; primarily plagioclase feldspar, pyroxene, and commonly olivine

Quartz-rich rock, possibly milky quartz or quartzite

Quartz (SiO₂), potentially quartzite if the grainy texture is rock-wide

Fuchsite on Quartzite

Muscovite (Chromium-bearing) K(Al,Cr)2(AlSi3O10)(OH)2

Green Aventurine

Quartz (Silicon Dioxide, SiO2) with fuchsite inclusions

Raw green aventurine (likely quartzite)

Quartz-rich quartzite, chiefly microcrystalline SiO₂ with green mica/fuchsite or chlorite

River Rocks (Polished River Pebbles)

Stream-rounded clastic sediments

Weathered pegmatite or feldspar-rich granite fragment

Granitic pegmatite, composed mainly of potassium feldspar and quartz, with minor mica; exact identification is uncertain from the photograph

Blue Sapphire (Ceylon)

Corundum (Al2O3) with traces of Iron and Titanium

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Green Aventurine

Aventurine Quartz (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Emerald

Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities

Sandstone

Quartz arenite / Lithic sandstone

Polished orbicular jasper (likely kambaba jasper)

Silicified microcrystalline quartz/chalcedony, commonly with chlorite- or amphibole-rich orbicules; composition varies

Nuummite

Nuummite (Orthoamphibole rock composed of Anthophyllite and Gedrite, (Mg,Fe)7Si8O22(OH)2)

Red Quartzite (Ferruginous Quartz)

Quartzite (SiO2 with Fe2O3 inclusions)

Apatite

Fluorapatite (Ca5(PO4)3F)

Quartzite

Quartzite (primarily composed of SiO O₂)

Glacial Cobbles (predominantly Granite and Gneiss)

Mixed lithologies (Quartz, Feldspar, Mica assemblage)

Black Tourmaline

Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)

Iron Slag

Ferrous slag (primarily silicates and oxides of calcium, iron, and magnesium)

Black Tourmaline

Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)

Aquamarine

Beryl (Be3Al2Si6O18)

Polished green-and-white stone, likely serpentine or nephrite jade

Serpentine-group minerals, commonly antigorite/lizardite; possible nephrite (interlocking actinolite–tremolite)

Weathered quartz-rich rock, likely sandstone or quartzite

Quartz arenite (sandstone) or quartzite; predominantly SiO₂

Rounded granite cobble

Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, potassium feldspar, plagioclase, and minor mica or amphibole

Quartzite with Mica

Metamorphic Quartzite (SiO2 + Mica phyllosilicates)

Conglomerate (or Breccia / Porphyry)

Clastic Sedimentary Rock (Conglomerate / Sandstone)

Conglomerate

Conglomerate (clastic sedimentary rock)

Banded Agate

Sedimentary Cryptocrystalline Quartz (SiO2)

White quartz-rich pebble

Likely quartzite or milky-quartz pebble (SiO₂)

Iron-stained quartz-rich rock, possibly jasper/quartzite

Quartz (SiO₂) with iron-oxide staining; likely ferruginous quartzite or jasper

Banded Basalt / Lave Stone or Gneiss Pebble

Igneous/Metamorphic banded pebble

Unakite (likely epidote–feldspar rock)

Epidote–K-feldspar–quartz aggregate; commonly approximated as pink orthoclase/microcline + green epidote + quartz

Mixed Mineral Collection

Multi-mineral Assemblage (Quartz, Jasper, Obsidian, Pyrite, etc.)

Ring with an Orange Inlay

N/A (Man-made object)

Marble

Crystalline Limestone (mostly CaCO3 / Calcium Carbonate)

Aquamarine

Beryl (Be3Al2Si6O18 with iron impurities)

Green Aventurine

SiO2 (Silicon Dioxide) with Fuchsite inclusions