Metamorphic Or Igneous

Quartz Vein on Matrix

Silicon Dioxide (SiO2)

Yellow Calcite

Calcium Carbonate (CaCO3)

Emerald

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

Weathered, iron-stained rock (likely sandstone or breccia)

Indeterminate clastic sedimentary rock; possible ferruginous sandstone or weathered breccia

Gold Ore in Matrix

Native Gold (Au) in Quartz/Host Rock

Gold Ore

Native Gold (Au) in Matrix

Likely black diamond or dark faceted gemstone ring

Uncertain from the photograph; possibly carbon (diamond) or black spinel, set in metal

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Polished garnet bead (likely almandine)

Almandine garnet, Fe₃Al₂(SiO₄)₃ (tentative visual identification)

Blue Quartz (or Blue Aventurine)

Silicon Dioxide (SiO2) with inclusions (typically Crocidolite or Dumortierite)

Labradorite

(Ca,Na)(Al,Si)4O8

Red cut gemstone, likely synthetic ruby

Corundum (Al₂O₃); possibly lab-grown ruby or red glass imitation

Blue faceted gemstone, likely synthetic sapphire or blue spinel

Corundum (Al₂O₃) if sapphire; alternatively magnesium aluminate spinel (MgAl₂O₄)

Ruby (Pink to Red Corundum)

Al2O3 (Corundum with Chromium impurities)

Weathered granite (likely with accessory quartz)

Granite; chiefly quartz, K-feldspar, plagioclase, and biotite/hornblende

Labradorite

Labradorite (Ca, Na)(Al, Si)4O8

Gold

Native Gold (Au)

Calcite

Calcium Carbonate (CaCO3)

Green Aventurine

Silicon Dioxide (Quartz with Fuchsite inclusions) - SiO2

Prasiolite (Green Quartz)

Silicon Dioxide (SiO2) with iron impurities

Black Diamond / Black Sapphire

Carbon (C) or Corundum (Al2O3)

Yellow Calcite

Calcium Carbonate (CaCO3)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) with host rock (often Schist or Basalt)

Milky Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

Emerald

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

Rough Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Sandstone (Micaceous Sandstone)

Arenite (SiO2 with KAl2(AlSi3O10)(OH)2 inclusions)

Blue Quartz

Silicon Dioxide (SiO2) with fibrous inclusions (such as tourmaline, magnesio-riebbeckite, or crocidolite)

Green Aventurine (Tumbled)

Silicon Dioxide (Quartz with inclusions, SiO2)

Agate

Silicon Dioxide (Chalcedony), SiO2

Green beryl gemstone (likely emerald or green beryl)

Beryl, Be₃Al₂Si₆O₁₈; green color from chromium/vanadium or iron

Ruby (Raw Corundum)

Corundum (Al2O3:Cr)

Milky Quartz (with Iron staining)

Silicon Dioxide (SiO2)

Blue faceted gemstone ring, likely synthetic sapphire or blue topaz

Uncertain from image; possible corundum (Al₂O₃) or topaz (Al₂SiO₄(F,OH)₂)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Milky Quartz (Quartz Vein)

Silicon Dioxide (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2) with Iron Oxide impurities

Green Quartz (Prasiolite/Adventurine)

Silicon Dioxide (SiO2) with inclusions

Emerald

Beryl (Be3Al2Si6O18 with chromium and vanadium impurities)

Yellow Aventurine

Quartz with inclusion minerals (SiO2)

Amazonite

Amazonite (Microcline Feldspar) K(AlSi3O8)