Cyclosilicate Collection

Benitoite was discovered in 1906 near the San Benito river in California which remains the only known locality for this (barium titanium silicate) mineral

Beryl
A cut heliodor beryl stone of 135.93 carats. Beryl comprises of beryllium aluminum silicate

Topaz
This 2982-carat topaz is the largest cut gem at the museum

Verdite head
African head carved in verdite by James Tandi. Verdite is also known as Africas Green Gold and is a member of the Silicates mineral group

Aquamarine
This Russian gem is about the size of a peach and weighs 898 carats

Morganite
This gemstone is 600 carats and one of the worlds largest Morganite specimens

Tourmaline cut stones see 666
A group of tourmaline cut stones. Tourmaline is the name given to a group of eleven minerals which all have a general chemical formula

Emerald
Possibly from the collection of Rt Hon Charles Greville in 1810. Emerald is a variety of beryl (beryllium aluminum silicate). The green colour attributed to small amounts of chromium

Cordierite-biotite-gneiss
Geological specimen collected by Scotts British Antarctic Expedition 1910-1913, also known as the Terra Nova expedition. It had a broad scientific programme and collected thousands of geological

Plate 3a from Histoire naturelle? (1789)
Plate 3a, Histoire Naturel Des Mineraux et de Pierres Precieuses, from Histoire naturelle: ou, Exposition des morceaux, les mieux choisis pour servir? (1789) by by Swebach Desfontaines

Plate 10, fig 1 from Mineralienbuch
An illustration of an axinite mineral specimen. Plate 10, fig 1 from Mineralienbuch by F. A. Schmidt, Stuttgart 1855

Plate 102 from Mineralogie
Superbe groupe de grands cristaux d Aigue marine de Siberie. From Recuille complet de Mineralogie Vol.3 (1790) by F. L. Swebach Desfontaines

Sapphire turban button
A rose-cut facetted deep-blue sapphire mounted in a button of quartz, inlaid with gold, rubies & emeralds. No 198 in the collection of Sir Hans Sloane

Uvarovite garnets comprise of (calcium chromium silicate). They are characterized by their green colour and rounded crystals of either 12 or 24 faces

Rubellite (Tourmaline) decoratively carved pendant. Specimen from the collections of the Natural History Museum, London

Birthstone Series: Emerald
A specimen of the gemstone, emerald from the Natural History Museum, London. Emerald is the birthstone for the month of May (along with Chrysoprase). Photographed by Harry Taylor

Pleochroism in an iolite cut stone
This iolite (magnesium aluminium silicate) is displaying pleochroism, a varied colour effect as the gem is turned. See also 3960

Beryl, variety aquamarine
A specimen of the gemstone, Beryl (Beryllium aluminum silicate). This is the aquamarine variety, which is the blue variety. Another variety of beryl is emerald, which is the green variety

Cordierite
A specimen of cordierite (magnesium aluminum silicate), a mineral from the class of silicates. Its gemstone variety called iolite is popular among gemstone collectors

Amethyst, baryte dioptase, rhodochrosite
Amethyst, purple crystals from India. Baryte, long yellow prisms from Cumbria. Dioptase, green lustrous crusts from Namibia. Rhodochrosite, pink crystals on quartz

Emerald crystals and cut stone
Emerald is a variety of beryl (beryllium aluminum silicate). The rich, green colour is attributed to small amounts of chromium which is unmatched by any other mineral species

Beryl crystals
Beautifully formed beryly variety crystals of aquamarine, heliodor, morganite and emerald. Beryl comprises of (beryllium aluminum silicate)

Emeralds
Emerald is a variety of beryl (beryllium aluminum silicate). The green colour is attributed to small amounts of chromium. Specimens from the Natural History Museum, London

Plate 3 from Histoire naturelle? (1789)
Plate 3, Histoire Naturelle ou Mineralogie Complete from Histoire naturelle: ou, Exposition des morceaux, les mieux choisis pour servir (1789) by by Swebach Desfontaines

Plate 4a from Histoire naturelle? (1789)
Plate 4a Mineralogie, [unfinished] from Histoire naturelle: ou, Exposition des morceaux, les mieux choisis pour servir? (1789) by by Swebach Desfontaines

Birthstone Series: Aquamarine
Aquamarine is the blue variety of beryl (beryllium aluminum silicate) and is the birthstone of the month of March. A gemstone from the Natural History Museum collections, in London

Axinite

Verdite
Polished surface of a verdite specimen from Jamestown, Transvaal. Verdite is also known as Africas Green Gold. It is a silicate mineral and often used for decorative carving and sculpture

Beryl specimen

Benitoite crystal and cut stone
Benitoite was discovered in 1906 near the San Benito river in California which remains the only known locality for this (barium titanium silicate) mineral

Chrysoberyl
Shown here is a crystal and a cut stone of chrysoberyl (beryllium aluminum oxide). Chrysoberl is a gemstone and is also known as cats eye

Imitation emerald
A faceted teardrop synthetic emerald

Pink rubellite tourmaline
Chinese pendant carving in pink rubellite tourmaline

Emerald on calcite
Well-formed hexagonal crystals of emerald on calcite. Emerald is a variety of beryl (beryllium aluminum silicate). The green colour is attributed to small amounts of chromium

Beryl
Deposits of the green variety of beryl (beryllium aluminum silicate) known as emerald. Specimens oginally from Ekatrinberg, Russia, now at the Natural History Museum, London

Beryl
A specimen of beryl (beryllium aluminum silicate). There are several varieties of beryl, aquamarine (blue), emerald (green), goshenite, heliodor and morganite

Emerald, a variety of beryl
A cut teardrop stone and a prismatic crystal of the green variety of beryl (beryllium aluminum silicate) known as emerald. Specimen from the Natural History Museum, London

Tourmaline
A specimen of the mineral and gemstone tourmaline from Itambacury Theophilo Ottoni, Minas Gerais, Brazil

Benitoite cut stone
Benitoite was discovered in 1906 near the San Benito river in California which remains the only known locality for this (barium titanium silicate mineral)

Beryl
From left to right, different varieties of berly (beryllium aluminum silicate) cut stone; emerald, aquamarine, morganite and heliodor

Cordierite variety Iolite
It is famous for its pleochroism, appearing intense blue in one direction but becoming almost colourless as the stone is turned. Cut stone, faceted girdle, 19.69 ct

A group of feldspar specimens
Amazonstone crystals and gems, pin set with sunstone, and moonstones. The feldpars are significant rock building minerals

Tourmaline crystal
A bi-coloured pink and green tourmaline crystal from California

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