Metamorphic Or Sedimentary Depending On Local Grade

Native Gold (in Jewelry)

Gold (Au)

Micaceous Rock (likely Muscovite Schist/Gneiss or a Muscovite-rich Specimen)

Predominantly Muscovite (KAl2(AlSi3O10)(F,OH)2), often found in rocks like Muscovite Schist or Muscovite Gneiss.

Aventurine (Green)

Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)

Greenstone (Epidote/Chlorite Rich Rock)

Metabasalt (often contains Epidote Ca2Al2(Fe3+;Al)(SiO4)(Si2O7)O(OH))

Mica Schist

Mica Schist (primarily Muscovite or Biotite KAl2(AlSi3O10)(OH)2)

Nuummite

Orthorhombic amphibole (Gedrite and Anthophyllite mixture) - (Mg,Fe)7Si8O22(OH)2

Greenstone

Greenschist (composed of actinolite, chlorite, and epidote)

Schist

Mica Schist (primarily consisting of muscovite KAl2(AlSi3O10)(OH)2 or biotite K(Mg,Fe)3(AlSi3O10)(OH)2)

Mica Schist

Foliated Metamorphic Rock (Schist)

Sandstone

Sandstone (lithified quartz arenite, arkose, graywacke, etc. depending on composition)

Quartz

Silicon Dioxide (SiO2)

Yellow Diamond

Diamond (Carbon, C)

Nephrite Jade

Ca2(Mg, Fe)5Si8O22(OH)2

Magnetite

Magnetite (Fe3O4)

Pyrite

Pyrite (FeS2)

Anthracite Coal

Anthracite (Carbon-based organic sedimentary rock exposed to metamorphic heat/pressure; Chemical composition is approximately 86%–98% Carbon)

Milky Quartz Vein with Iron Staining

Silicon Dioxide (SiO2)

Corundum (Ruby/Sapphire crystal)

Al2O3 (Aluminum Oxide)

Schist

Mica Schist (predominantly Muscovite/Biotite)

Mica Schist

Mica Schist (primarily Muscovite and Biotite KAl2(AlSi3O10)(OH)2)

Limonite (Iron Ore/Hydrated Iron Oxide)

Limonite (mixture of FeO(OH)·nH₂O minerals, mainly Goethite, FeO(OH) and Lepidocrocite, FeO(OH))

Marble

Metamorphosed Limestone/Dolomite

Quartzite (or Milky Quartz pebble)

Quartzite (Metamorphosed Sandstone) / Silicon Dioxide (SiO2)

Rough Corundum (Sapphire/Ruby mixture)

Corundum (Aluminum Oxide, Al2O3)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Tanzanite (Blue Zoisite)

Ca2Al3(SiO4)(Si2O7)O(OH) + (V) - Vanadium-bearing Zoisite

Nuummite

Nuummite (Orthorhombic amphiboles: Anthophyllite and Gedrite)

Blue Apatite

Apatite group (Ca5(PO4)3(F,Cl,OH))

Rhodonite

Rhodonite (Mn,Fe,Mg,Ca)SiO3

Garnet (likely Almandine or a blend)

Garnet group: X3Y2(SiO4)3, where X can be Ca, Mg, Fe2+, Mn2+ and Y can be Al, Fe3+, Cr3+. Given the dark, somewhat reddish-brown appearance in the image, it's likely Almandine (Fe3Al2(SiO4)3) or a mix with other iron-rich garnets.

Greenstone

Metabasalt

Greenstone (Greenstone River Pebble)

Greenschist (metamorphosed mafic igneous rock)

Greenstone (Epidosite or Altered Basalt)

Epidosite (Ca2(Al, Fe)3(SiO4)3(OH))

Epidote in Matrix (likely Amphibolite or Gneiss)

Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH)) in Metamorphic Matrix

Gold Nugget

Native Gold (Au)

Schist

Mica Schist (Medium-grade metamorphic rock)

Amethyst

Silicon Dioxide (SiO2) with Iron impurities

Sapphire (Corundum)

Corundum (Al2O3), variety Sapphire

Schist

Crystalline Metamorphic Rock (Schistose)

Schist

Mica Schist

Stilbite

Stilbite-Ca (NaCa4Mg[Al9Si27O72]·28H2O)

Slate

Slate (Foliated metamorphic rock consisting mainly of quartz and muscovite or illite)