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

Picture No. 11091688
Chrysocolla hydrated copper cyclosilicate mineral with formula: Cu2-xAlx(H2-xSi2O5)(OH)42O (x <1), minor ore of copper Date:

Topaz C016 / 6141
Topaz. This 2982-carat topaz is the largest cut gem at the Natural History Museum, London, UK

Morganite C016 / 6142
Morganite. This gemstone is 600 carats and one of the worlds largest Morganite specimens. Natural History Museum, London, UK

Axinite C016 / 6082
Axinite. Specimen number BM 1969, 286 from Stamps and Jowl Zawn, Roscommon Cliff, Cornwall, UK. Natural History Museum, London, UK

Tourmaline specimen C016 / 5991
Tourmaline. A composite, doubly-terminated crystal of schorlite, with a little limonite and crystal of apatite. From Minerals of Cornwall and Devon (1987) by P.G. Embrey and R.F. Symes

Watermelon tourmaline C016 / 6140
Watermelon tourmaline gemstone. Natural History Museum, London, UK

Axinite C016 / 6090
Axinite. Specimen number BM 1969, 286 from Stamps and Jowl Zawn, Roscommon Cliff, Cornwall, UK. Natural History Museum, London, UK

Banded gneiss C016 / 6208
Cordierite-biotite-gneiss. Geological specimen collected by Scotts British Antarctic Expedition 1910-1913, also known as the Terra Nova expedition

Axinite C016 / 6084
Axinite. Specimen number BM 1969, 286 from Stamps and Jowl Zawn, Roscommon Cliff, Cornwall, UK. Natural History Museum, London, UK

Tourmaline C016 / 5653
Specimen of Tourmaline from Antsirabe, Madagascar. Section of a crystal showing colour zoning. Tourmaline is a hexagonal mineral, vertically striated

Beryl C016 / 5624
Beryl (beryllium aluminum silicate). There are several varieties of beryl, aquamarine (blue), emerald (green), goshenite, heliodor and morganite. This specimen is from Taleovaya River, Russia

Benitoite C016 / 5625
Benitoite (barium titanium silicate). Benitoite was discovered in 1906 near the San Benito river in California which remains the only known locality for this mineral

Tourmaline C016 / 5622
Tourmaline. Specimen from Itambacury Theophilo Ottoni, Minas Gerais, Brazil. Natural History Museum, London, UK

Tourmaline schorl specimen C016 / 4993
Tourmaline schorl specimen. Tourmaline has a very complex and variable composition. The most common form is schorl or schorlite, shown here

Tourmaline crystal specimens C016 / 4929
Tourmaline crystal specimens. Tourmaline has a very complex and variable composition. Clear and pure crystals of green and red tourmaline, such as these bi-coloured crystals

Tourmaline crystal specimen C016 / 4862
Tourmaline crystal specimen. Tourmaline has a very complex and variable composition. Clear and pure crystals of green and red tourmaline are highly prized gemstones

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

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"Cyclosilicate: A Fascinating World of Gemstones and Minerals" Step into the mesmerizing world of cyclosilicates, where nature's artistic prowess is on full display. From the deep blue hues of Benitoite to the vibrant green shades of Beryl, these gemstones captivate with their stunning colors and unique structures. Picture No. 11091688 unveils a breathtaking Verdite head, showcasing the intricate patterns formed by cyclosilicates. As you delve deeper into this realm, Topaz C016 / 6141 enthralls with its golden radiance while Morganite C016 / 6142 exudes a delicate pink allure. Axinite C016 / 6082 reveals an enchanting blend of brown and purple tones, reminiscent of earthy landscapes. Meanwhile, Tourmaline specimen C016 / 5991 dazzles with its rainbow-like spectrum that never fails to amaze. Watermelon tourmaline C016 / 6140 steals the show with its captivating fusion of green and pink hues - a true natural wonder. Axinite C016 / 6090 boasts a rich brown coloration that adds warmth to any collection. Amongst this treasure trove lies Banded gneiss C016 / 6208 - an exquisite rock formation displaying alternating layers in various shades and textures; truly a testament to Earth's geological wonders. Intriguingly beautiful and diverse in form, cyclosilicates offer endless possibilities for both collectors and admirers alike. Whether it be their striking colors or intricate patterns, these gems never fail to leave us in awe at nature's remarkable creations.