Native Metal Collection (page 4)

Millerite comprises of (nickel sulphide) and is characterized by hair-like fibrous crystals arranged into sprays. Specimen from the collections of the Natural History Museum, London

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

Heulandite crystal group on matrix, from Kilpatrick, Dumbartonshire. One of the group of Zeolites. Zeolites are microporous crystalline solids containing silicon, aluminium and oxygen

Spinel crystal and cut stone
Spinel (magnesium aluminium oxide) crystal from Ruby Mines, Mogok, Burma with spinel cut stone from Sri Lanka. Spinel is found in a red colour and has been previously mistaken for ruby

Anatase
A brown to black single tetragonal crystal of anatase (titanium oxide). Anatase is a polymorph of rutile and brookite, meaning they carry the same chemistry, but with a different structure

Lycoptera, bony fish fossil
Fossil of a bony fish found in jurassic China, 206-142 million years ago

Sphalerite or zinc blende
Dark crystals of sphalerite or zinc blende comprised of (zinc iron sulphide). Specimen from the collections of The Natural History Museum, London

Dillenia alata, red beech tree
Copper plate from the original drawing by Sydney Parkinson made during Captain James Cooks first voyage across the Pacific, 1768-1771

Bornite
A specimen of the mineral Bornite. This specimen is from the collections held at the Natural History Museum, London

Descloizite is comprised of (lead zinc vanadate hydroxide) and is characterized by platy crystals with a rounded triangualr shape. Specimen from the Natural History Museum, London

Caledonite comprises of (copper lead carbonate sulphate hydroxide) and is characterized by small, well-formed intricate crystals. This specimen is from the Natural History Museum, London

Jamesonite comprises of lead iron antimony sulphide, and is characterized by hair-like fibrous crystals. This specimen is from the collections held at the Natural History Museum, London

Andradite is variety dementoid, garnet and comprises of (calcium iron silicate). These crystals are in a matrix from Lanzada, Valtellina, Italy and the cut stone is from an unknown locality

Cobaltite

Diagram showing the Earths interior
Crust - continents 35km, oceans 6km. Mantle - peridotite 2900km. Outer core - iron (liquid) 2000km. Inner core - iron (solid) 1370km

A selection of topaz cut stones
Topaz is the hardest silicate mineral and comprises of (aluminum silicate fluoride hydroxide)

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

Olivine comprises of (magnesium iron silicate) and is a common source of magnesium. Peridot is the gemstone variety of olivine. Specimen from the Natural History Museum, London

Gold can be rediposited during the processes taking place in the earths crust underneath volcanoes. Water traveling through cooled magma can collect minerals from igneous rock and move them elsewhere

Chondrodite
Chondrolite comprises of (magnesium iron silicate fluoride hydroxide) and often occurs in a granular form in crystalline limestones. Specimen from the Natural History Museum, London

Chalcophyllite
Chalcopyrite or copper pyrite comprises of (copper iron sulphide). Its a common mineral and found in almost all sulphide deposits

Rubies and sapphires
Crystals of ruby from Burma which is the red variety of corundum (aluminium oxide). The other variety is sapphire, this specimen is from Kashmir. The lower left specimen is the Edwardes Ruby

Native Iron
Native iron is a heavy, magnetic element (Fe). Specimen from the collections of the Natural History Museum, London

Peridot cut stone 146. 1 ct
Peridot is gem variety of the mineral olivine (Magnesium Iron Silicate). It is also the birthstone of August

Jade and gold casket (Lid shut)
This casket was given to the Duchess of Cornwall and York in 1901 inscribed From many Loyal Women of the Province of Aukland

Topaz
A crystal and a cut topaz stone from the collections of the Natural History Museum, London. Topaz comprises of (aluminum silicate fluoride hydroxide)

Ruby and sapphire gravel
Ruby and sapphire fragments from gem gravels seen on a background of slate. Ruby and sapphire are both varieties of the mineral corundum (aluminium oxide)

Jadeite crystal and cut stone
Jadeite comprises of (sodium aluminum iron silicate) and is actually not a mineral outright, but is a variety of the mineral actinolite. Specimens from the Natural History Museum, London

Tiger s-eye and Hawk s-eye
Formed when blue crocidolite asbestos is replaced by quartz. Hawk s-eye retains the original colour while tiger s-eye contains a residue of iron oxide

Zincite comprises of (zinc oxide). It is an important ore of zinc, and almost exclusive to one mining locality in New Jersey, U.S.A. Specimen from the Natural History Museum, London

Hemimorphite
A specimen of the mineral hemimorphite (hydrated zinc silicate hydroxide). This mineral was formerly known as calamine

Tenorite is comprised of (copper oxide). It is found as grey to black metallic crystals and as a by-product of lava flows. Fibrous specimen from the Natural History Museum, London

Franklinite, fluorescing
Ore of zinc fluorescing under ultra violet radiation: calcite - pink; willemite - green; zincite - blue; franklinite - black. See image number 388 for white light view

Phosphophyllite comprises of (hydrated zinc iron manganese phosphate). Blue-green specimen from the collections of the Natural History Museum, London

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

Augelite comprises of (aluminum phosphate hydroxide). This specimen has well developed semi-transparent crystals and is from the Natural History Museum, London

Cancrinite comprises of (sodium calcium aluminum silicate carbonate) and is one of the rarer members of the feldspathoid group. Specimen from the Natural History Museum, London

Spodumene
A specimen of the mineral spodumene (lithium aluminium silicate). This mineral comes in two varieties, Kunzite and Hiddenite

Chlorargyrite is a mineral consisting of silver chloride

Stilbite comprises of (hydrated sodium calcium aluminum silicate) and derives from the Zeolite group. Specimen from the collections of The Natural History Museum, London

Thomsonite

Thryomanes bewickii, Bewicks wren
Plate 18 from John James Audubons Birds of America, original double elephant folio (1827-30), hand-coloured aquatint. Engraved, printed and coloured by R. Havell (& Son), London

Olivenite comprises of (copper arsenate hydroxide). It is a rare copper mineral normally deep olive green in coluor. Specimen from Wheal Jewel, Gwennap, Cornwall

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

Lazulite comprises of (magnesium iron aluminum phosphate hydroxide) not to be confused with lazurite - as it looks and sounds the same is a rare ornamental and gemstone

Boulangerite comprises of (lead antimony sulphide) and is characterized by fine, fibrous crystals. This specimen is from the Natural History Museum, London

Stephanite

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

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