Mineral (Gemstone)

Quartz

Silicon Dioxide (SiO2)

Amethyst

Quartz (Silicon Dioxide, SiO2)

Rose Quartz and Pegmatite

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

Citrine Quartz

Silicon Dioxide (SiO2) with ferric iron impurities

Emerald in Matrix

Emerald (Beryllium Aluminum Silicate - Be3Al2(SiO3)6)

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Botryoidal Chalcedony

Silicon Dioxide (SiO2)

Amazonite

Microcline (KAlSi3O8) with Pb impurities

Quartz (Citrine variety)

Silicon Dioxide (SiO2)

Sunstone

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

Fire Opal (in Matrix)

Hydrated Silica (SiO2·nH2O)

Turquoise in Matrix

Hydrous phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O

Sunstone

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

Amethyst

Quartz (Silicon Dioxide with Iron impurities), SiO2

Amazonite

KAlSi3O8 (Potassium aluminum silicate - blue-green variety of Microcline)

Jasper

Silicon dioxide (Microcrystalline Quartz, SiO2)

Amazonite

Potassium Aluminum Silicate (KAlSi3O8)

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Prehnite

Prehnite, Ca2Al2Si3O10(OH)2

Green Quartz (Prasiolite)

Crystalline Silicon Dioxide (SiO2)

Quartz Mineral

Silicon Dioxide (SiO2)

Green glassy stone, possibly aventurine or green jade

Unidentifiable from the image; possible quartz-rich aventurine (SiO₂) or jadeite/nephrite

Tumbled smoky quartz

Quartz, silicon dioxide (SiO₂), colored by irradiation and trace aluminum

Amazonite

Potassium Feldspar (KAlSi3O8)

Cabochon gemstone ring, likely smoky quartz or tourmaline

Unconfirmed quartz (SiO₂) or brown tourmaline (dravite); visual identification is inconclusive

Quartz Crystal

Silicon Dioxide (SiO2)

Red garnet cabochon pendant

Likely almandine garnet, iron-rich garnet-group silicate (often approximated as Fe₃Al₂(SiO₄)₃); identification from the image is uncertain.

Blue-green opal, likely polished common or synthetic opal

Opal (hydrated amorphous silica, SiO₂·nH₂O); identification from the image is uncertain

Quartz

SiO2 (Silicon Dioxide)

Amazonite

Microcline (KAlSi3O8)

Rhodochrosite with Quartz

Manganese Carbonate (MnCO3) with Silicon Dioxide (SiO2)

Sunstone

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

Milky Quartz

Silicon Dioxide (SiO2)

Amazonite

Microcline (KAlSi3O8)

Prehnite

Prehnite - Ca2Al(AlSi3O10)(OH)2

Prehnite with Epidote

Prehnite (Ca2Al(AlSi3O10)(OH)2) with Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))

Bicolor or Tricolor Tourmaline

Elbaite (Na(Li,Al)3Al6(BO3)3Si6O18(OH)4)

Emerald in Matrix

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Amazonite

K(AlSi3O8)

Amethyst Geode

Amethyst/Purple Quartz (SiO2)

Amethyst

Silicon dioxide (SiO2) with iron impurities

Amazonite

K(AlSi3O8) - Potassium Aluminum Silicate