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Birthstone Series: AquamarineAquamarine 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
Birthstone Series: GarnetGarnet has a chemical composition of iron aluminium silicate. It is the birthstone of the month of January. Gemstone from the Natural History Museum collections, in London
Axinite
Chalcedony variety of quartzA specimen of the mineral chalcedony, a variety of quarz, from the Haytor mine, Ilsington, Devon
Enstatite comprises of (magnesium silicate) and derives from the pyroxene group. Specimen from the collections of the Natural History Museum, London
VerditePolished 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
NatroliteA specimen of the mineral natrolite (Hydrated sodium aluminum silicate), of the group zeolite, from Neubauerberg, Bohemia
Unakite
ZeoliteA zeloite specimen (apophyllite)
Sodalite specimen
Shergottite Sayh al Uhaymir 008, found in Oman in 1999. Shergottites are silicate rocks that are divided into four subgroups. This specimen is about 10cm long
Slice of the lunar meteorite Northwest Africa 482A slice of lunar meteorite Northwest Africa 482. This meteorite is very rich in the feldspar mineral anorthite, which give it its pale colour
Slab of the Lueders meteoriteA slab of the IAB iron meteorite Lueders showing the size, shapes and distribution of silicate inclusions. The slab is about 10cm wide
Microscope image of the Brachina meteorite, the type specimen of the Brachinite meteorites. Brachinites are composed mostly of olivine with minor amounts of pyroxene and plagioclase
The Parnalle ordinary chondriteThe Parnallee ordinary chondrite, part of the Parnallee meteorite that fell in India in 1857
Porphyritic olivine and pyroxene chondruleMicroscopic image of a porphyritic olivine and pyroxene chondrule from the Palmyra (L3) ordinary chondrite (the chondrule is about 1.8mm across)
Lepidolite
Fuchsite specimen
Carnelian specimen
Citrine specimen
Chrysocolla, (hydrated copper silicate)
Chiastolite
Beryl specimen
Amazonite
Agate moss
Agate dyed
AgateDyed agate
AgateBotswana agate
Diamond with garnetRed garnet crystal in an octagonal, step-cut diamond. Diamond comprises of compacted carbon and is the hardest natural substance known on Earth
Peridot groupFine cut peridot of 146 carats (centre) with crystals and rough mass (right) from Zebirget, and Hawaiian basalt containing olivine crystals (left)
Benitoite crystal and cut stoneBenitoite was discovered in 1906 near the San Benito river in California which remains the only known locality for this (barium titanium silicate) mineral
Spodumene crystal and cut stoneLarge spodumene (Lithium Aluminum Silicate) crystal and cut gemstone from Brazil
AgateA cut and polished section of brown banded agate from Brazil. Agate (silicon dioxide) is a cryptocrystalline quartz
Topaz crystals and faceted topaz showing a diverse colour range. Topaz comprises of (aluminum silicate fluoride hydroxide)
Citrine and amethyst are both varieties of quartz (silicon dioxide)
GarnetsFaceted garnets showing a range of colours. Garnet is the birthstone of January
Kunzite crystal and cut stoneStrongly dichroic pink kunzite crystal and faceted kunzite. Kunzite (lithium aluminum silicate) is the pink variety of spodumene and is pleochroic
Labradorite carving
ZirconsFaceted zircons showing various colours and high lustre, from Sri Lanka. Zircon comprises of (zirconium silicate) and is not the same as the artificial gem cubic zircona
TopazBlue irradiated topaz pebbles and faceted topaz. Topaz is comprised of (aluminum silicate fluoride hydroxide)
LabradoriteA close-up of the surface of a rich blue specimen of the mineral labradorite from labrador. Labradorite (calcium sodium aluminum silicate)
Imitation emeraldA faceted teardrop synthetic emerald
AgateA cut and polished section of blue agate from Idar-Oberstein, Germany. Agate (silicon dioxide) is a cryptocrystalline quartz
Green demantoid garnet in ring from the collection of Sir Arthur Herbert Church. Dementoid is the green variety of andradite garnet
Pink rubellite tourmalineChinese pendant carving in pink rubellite tourmaline
Emerald on calciteWell-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
TopazImage of Queen Victoria carved in topaz. Topaz comprises of (aluminum silicate fluoride hydroxide)
Almandine garnetsBrooch set with almandine garnets. Almandine comprises of (iron aluminum silicate) and is the most common of the garnets