Metamorphic

Green jade-like cabochon pendant

Unidentified green gem; possibly jadeite (NaAlSi₂O₆) or nephrite (Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂)

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Black tourmaline (likely schorl)

Schorl, NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

Tumbled quartz-rich pebble

Quartz (SiO₂), likely with iron-oxide staining and minor inclusions

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)

Specular Hematite (Specularite)

Iron(III) oxide (Fe2O3)

Green Aventurine

Silicon Dioxide (Quartz with Fuchsite inclusions) - SiO2

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Almandine Garnet

Almandine, Fe3Al2(SiO4)3

Faceted red gemstone, likely synthetic ruby or red spinel

Possibly corundum (Al₂O₃, ruby) or spinel (MgAl₂O₄); identity cannot be confirmed from the image

Tumbled green aventurine

Quartz (SiO₂) with fuchsite or other green mica inclusions

Tumbled green aventurine (probable)

Quartzite composed chiefly of quartz (SiO₂), with green fuchsite or other mica inclusions

Magnetite-rich ironstone (probable magnetite ore)

Magnetite, Fe₃O₄, likely in a fine-grained ironstone matrix

Pyrite

Iron Pyrite (FeS2)

Tumbled rhodonite

Rhodonite, manganese inosilicate (MnSiO₃), commonly mixed with quartz and manganese oxides

Ruby in Zoisite

Anyolite

Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Pyrite (on the right) and Magnetite or Hematite (on the left)

Iron Sulfide (FeS2) and Iron Oxide (Fe3O4 or Fe2O3)

Green Aventurine

Silicon dioxide (SiO2) with inclusions of Fuchsite mica

Rhodonite

Manganese Silicate (Mn, Fe, Mg, Ca)SiO3

Greenstone / altered mafic rock

Likely chlorite–epidote–actinolite schist or altered basalt (greenstone); exact identification requires thin-section or chemical testing.

Quartzite (iron-stained, possibly metaconglomeratic)

Quartzite; predominantly recrystallized quartz (SiO₂) with iron-oxide accessory minerals

Epidote

Epidote (Ca2(Al2,Fe3+)AlSi3O12(OH))

Greenstone (likely chlorite-rich metamorphic rock)

Greenschist; commonly composed of chlorite, actinolite, epidote, and albite

Tumbled quartz-rich pebble, possibly milky quartz or quartzite

Quartz (SiO₂), potentially quartzite if metamorphically recrystallized

Quartz-rich rock fragment

Likely milky quartz (SiO₂), possibly a pale quartzite fragment

Spessartine Garnet

Manganese aluminum silicate, Mn3Al2(SiO4)3

Kyanite

Kyanite (Al2SiO5)

Lapis Lazuli

Lapis Lazuli (Rock composed mainly of lazurite, calcite, and pyrite)

Nephrite Jade

Ca2(Mg,Fe)5Si8O22(OH)2 (Actinolite-Tremolite series)

Lapis Lazuli

Lapis Lazuli (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2

Phyllite

Phyllite (Intermediate grade metamorphic rock)

Slate

Slate; fine-grained metamorphosed shale, commonly composed of quartz, illite/muscovite, and chlorite

Epidote Water-Worn Pebble

Epidote {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)

Sandstone or Quartzite

Arenite (if sedimentary) / Quartzite (if metamorphic)

Sugilite

KNa2(Fe,Mn,Al)2Li3Si12O30

Fuchsite

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

Tiger's Eye

Silicon dioxide with crocidolite inclusions (SiO2)

Quartz

Silicon Dioxide (SiO2)

Yellow Calcite

Calcium Carbonate (CaCO3)

Blue Apatite

Fluorapatite (Ca5(PO4)3(F,Cl,OH))

Rhodonite

Rhodonite (MnSiO3)