Silicate Collection (page 5)

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

Birthstone Series: Garnet
Garnet 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 quartz
A 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

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

Natrolite
A specimen of the mineral natrolite (Hydrated sodium aluminum silicate), of the group zeolite, from Neubauerberg, Bohemia

Unakite

Zeolite
A 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 482
A 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 meteorite
A 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 chondrite
The Parnallee ordinary chondrite, part of the Parnallee meteorite that fell in India in 1857

Porphyritic olivine and pyroxene chondrule
Microscopic 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

Agate
Dyed agate

Agate
Botswana agate

Diamond with garnet
Red garnet crystal in an octagonal, step-cut diamond. Diamond comprises of compacted carbon and is the hardest natural substance known on Earth

Peridot group
Fine 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 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

Spodumene crystal and cut stone
Large spodumene (Lithium Aluminum Silicate) crystal and cut gemstone from Brazil

Agate
A 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)

Garnets
Faceted garnets showing a range of colours. Garnet is the birthstone of January

Kunzite crystal and cut stone
Strongly dichroic pink kunzite crystal and faceted kunzite. Kunzite (lithium aluminum silicate) is the pink variety of spodumene and is pleochroic

Labradorite carving

Zircons
Faceted 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

Topaz
Blue irradiated topaz pebbles and faceted topaz. Topaz is comprised of (aluminum silicate fluoride hydroxide)

Labradorite
A close-up of the surface of a rich blue specimen of the mineral labradorite from labrador. Labradorite (calcium sodium aluminum silicate)

Imitation emerald
A faceted teardrop synthetic emerald

Agate
A 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 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

Topaz
Image of Queen Victoria carved in topaz. Topaz comprises of (aluminum silicate fluoride hydroxide)

Almandine garnets
Brooch set with almandine garnets. Almandine comprises of (iron aluminum silicate) and is the most common of the garnets

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