Mineral (Gemstone)

Tanzanite

Blue Zoisite (Ca2Al3(SiO4)(Si2O7)O(OH))

Garnet (Spessartine / Almandine)

Fe3Al2(SiO4)3 to Mn3Al2(SiO4)3 (Nesosilicate)

Cat's Eye Moonstone (Feldspar)

Orthoclase (KAlSi3O8) with Albite (NaAlSi3O8) inclusions

Tiger's Eye

Quartz pseudomorph after crocidolite (SiO2)

Small unidentified mineral specimen

Indeterminate from image; possibly a quartz-family crystal or sulfide mineral

Carved Gemstone Mushroom

Quartz / Feldspar composite (Carved lapidary art)

Quartz (Smoky Quartz with inclusions)

Silicon Dioxide (SiO2)

Rhodonite

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

Emerald in Matrix

Beryl (Be3Al2Si6O18) with trace amounts of Chromium/Vanadium

Emerald in Host Rock

Beryl (Be3Al2Si6O18) containing Chromium and/or Vanadium

Tumbled quartz-rich stone, possibly blue quartz or granite

Quartz (SiO₂), with probable feldspar and dark accessory minerals

Amethyst (Faceted Gemstone)

Silicon Dioxide (SiO2) with iron impurities

Pale green rough mineral fragment, likely serpentine or chrysoprase

Probable serpentine-group mineral (Mg₃Si₂O₅(OH)₄) or nickeline-free green chalcedony; identification is uncertain from the image

Quartz

Silicon dioxide (SiO2)

Rose Quartz

Silicon Dioxide (SiO2)

Green Tourmaline (Verdelite)

Complex sodium iron aluminum borosilicate (Na(Mg,Fe,Li,Al,Mn)3Al6(BO3)3Si6O18(OH)4)

Polished Mexican “Crazy Lace” agate tower

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide inclusions

Fluorite

Calcium Fluoride (CaF2)

Likely weathered quartz or feldspar grain

Uncertain; possibly quartz (SiO₂) or a feldspar mineral

Amber

Succinate (Fossilized Tree Resin)

Amber / Fossilized Resin

Succinite / Fossilized Tree Resin

Carnelian and White Quartz Bracelet

Silicon Dioxide (SiO2) - specifically Carnelian (Chalcedony) and Rock Crystal/Snow Quartz

Olivine (Peridot)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Olivine (Peridot)

Magnesium Iron Silicate (Mg, Fe)2SiO4

Mixed mineral and gemstone specimens

Likely amethyst (quartz), malachite, blue calcite or dyed chalcedony, red jasper, and green aventurine/serpentine

Clear Quartz

SiO2 (Silicon Dioxide)

Cut red gemstone, likely ruby

Ruby, gem-quality corundum (Al₂O₃) colored by chromium

Malachite / Copper Ore

Cu2CO3(OH)2

Likely lepidolite-bearing mica or purple fluorite

Lepidolite: K(Li,Al)3(Si,Al)4O10(F,OH)2; alternatively fluorite: CaF2

Likely white quartz or quartz-rich pebble

Quartz (silicon dioxide, SiO₂), possibly a small polished/tumbled specimen

Amethyst (Druzy Quartz)

Amethyst (Silicon Dioxide - SiO2 with iron impurities)

Red Jasper

Jasper (Silicate mineral - SiO2)

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Fluorite with Quartz

Fluorite (CaF2) and Quartz (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Sunstone

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

Blue Zircon

Zircon (Zirconium Silicate), ZrSiO4

Precious Coral (Red Coral)

Corallium rubrum (Calcium Carbonate, CaCO3)

Amethyst jewelry centerpiece

Amethyst, purple quartz (SiO₂), likely set with colorless diamonds or other gems

Jasper

Microcrystalline Quartz (SiO2)

Small pale mineral fragment

Indeterminate; possibly quartz or calcite

Green Quartz (Prasiolite variant or Aventurine)

Silicon Dioxide (SiO2)