Metamorphic

Rounded gray river pebble, likely quartzite or fine-grained metamorphic rock

Quartzite (probable; chiefly recrystallized quartz, SiO₂)

Almandine Garnet

Fe3Al2(SiO4)3

Greenschist

Chlorite schist

Red coral (coral beads)

Precious coral, usually Corallium spp.; composed primarily of calcium carbonate (calcite)

Clear quartz (rock crystal)

Quartz, crystalline silicon dioxide (SiO₂)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Greenish Metamorphic Rock (likely containing epidote or chlorite)

Metamorphic rock, possibly epidosite or greenstone

Banded gneissic rock

Gneiss, likely quartz–feldspar–biotite gneiss

Quartz with Epidote

Silicon dioxide (SiO2) with Calcium aluminum iron silicate (Ca2Al2(Fe3+;Al)(SiO4)(Si2O7)O(OH))

Greenschist

Greenschist (Chlorite-actinolite schist)

Quartzite

Quartzite

Rhodonite

Manganese Inosilicate (MnSiO3)

Black Tourmaline

Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)4)

Yellow Sapphire (Pukhraj)

Corundum (Al2O3)

Quartz

Silicon dioxide (SiO2)

Schist

Schist

Veined quartz-bearing metamorphic rock

Likely quartzite or siliceous schist with iron-oxide staining

Spessartine Garnet

Mn3Al2(SiO4)3

Weathered quartz-rich metamorphic rock, likely quartzite

Quartzite (mostly microcrystalline quartz, SiO₂), possibly altered sandstone

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly crystalline SiO₂, possibly with mica or iron-oxide impurities

Iolite (Cordierite)

Cordierite (Magnesium Aluminum Silicate), Mg2Al4Si5O18

Pink-red faceted gemstone, possibly synthetic corundum or spinel

Uncertain; possible ruby (corundum, Al₂O₃) or red spinel (MgAl₂O₄)

White quartz pebble (probable)

Quartz, silicon dioxide (SiO₂)

Ruby in Zoisite (Anyolite)

Ruby-Zoisite

Blue Apatite

Calcium phosphate mineral, Ca5(PO4)3(F,Cl,OH)

Green Aventurine

SiO2 (Silicon Dioxide with inclusions of Fuchsite)

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

Blue Quartz (Dumortierite Quartz)

SiO2 with inclusions of AlAl6BSi3O18

Dumortierite Quartz

Dumortierite (Al7BO3(SiO4)3O3 / inclusion in SiO2)

Emerald in Matrix (Quartz/Schist)

Beryl (Be₃Al₂Si₆O₁₈) with Chromium/Vanadium impurities

Specular Hematite

Specularite (Fe2O3)

Greenstone / Greenschist

Greenschist (containing Chlorite, Epidote, Actinolite)

Carved jade pendant

Likely jadeite (NaAlSi₂O₆) or nephrite (Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂); the image alone cannot distinguish them

Ruby cabochons

Corundum, aluminum oxide (Al₂O₃), colored red by chiefly chromium

Raw Emerald (Emerald Beryl)

Beryl (Be3Al2Si6O18) with chromium/vanadium impurities

Tumbled jade-like stone, likely jadeite or nephrite

Jadeite (NaAlSi₂O₆) or nephrite, a fibrous amphibole aggregate

Polished/tumbled rhodonite-rich stone

Rhodonite (MnSiO₃), likely mixed with quartz and manganese oxides

Green Aventurine

Silicon Dioxide (Quartz) with Fuchsite inclusions (K(Al,Cr)2(AlSi3O10)(OH)2)

Blue Quartz

Silicon Dioxide (SiO2) with microinclusions

Rounded dark metamorphic pebble

Likely mica schist or chlorite-rich greenschist; exact identification requires testing

Tumbled clear quartz

Quartz (SiO₂)

Tumbled clear quartz

Quartz (silicon dioxide, SiO₂)