Mineral Collection (page 11)

Included diamond gemstone
A two-carat rectangular step-cut diamond with a large violet-red garnet inclusion visible in the table facet

Precious opal in ironside nodule
Opals are not truely crystalline and are therefore mineraloids. They comprise of (hydrated silica glass). Specimen found in Queensland, Australia. On display at the Natural History Museum, London

Sulphur springs, St. Michael, Azores 1873
A photograph taken during the voyage of H.M.S. Challenger (1872-1876), funded by the British Government for scientific purposes

Birthstone Series: Opal
Opal is a form of silica and it is the birthstone (along with Tourmaline) for the month of October. Natural History Museum specimen number: 1908, 235. Photographed by Harry Taylor

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

Pyrite, Fools Gold
Regular, cube-shaped crystals look as if they ve been polished but are formed like this within rock cavities. Pyrite comprises of (iron sulphide)

Columbite
Specimen used by Charles Hatchett when he discovered niobium (then called columbium) and now called columbite in 1801. Mineral collection, the Natural History Museum

Gobbinsite comprises of (hydrated sodium potassium calcium aluminum silicate) and derives from the zeolite group. Specimen found nr. Black Cave, Island Magee, Co. Antrim

Orthoclase (potassium aluminum silicate) is a major granite forming mineral. Specimen from Brevik, Norway

Gypsum is comprised of (hydrated calcium sulphate). It forms from the evaporation of highly saline waters producing massive beds

Rhodonite
A pink specimen of rhodonite (manganese iron magnesium calcium silicate). Rhodon is greek for rose. Specimen from the Natural History Museum, London

The discovery of Niobium
Paper by Charles Hatchett, read at the Royal Society London 1801, describing how he discovered niobium (then called columbium). This mineral is now known as Columbite

Spessartine comprises of (manganese aluminum silicate) and is found in metamorphic environments

Gold in unspecified mineral
Scanning electron microscope image of an elemental map showing the distribution of gold (Au) in mineral samples

Psilomelane
A bright black botryoidal mass of psilomelane. Psilomelane comprises of (barium manganese oxide hydroxide). Specimen from Monkstone mine, Brent Tor, Devon

Marcasite comprises of (iron sulphide). It is similar in appearance to pyrite, but has a different structural composition

Phenakite is comprised of (beryllium silicate). Visually it closely resembles quartz, but chemically it is closer to gemstones such as topaz and beryl

Wavellite
Aggregates of honey-coloured wavellite forming radiating needles on slate. Wavellite comprises of (hydrated aluminum phosphate hydroxide). Specimen from Filleigh, Devon

Fluorite, pale green octahedron
With calcite, galena and pyrite. Its properties include fluorescence and cubed crystals. Specimen from Glengowla East mine, Oughterard, Co. Galway, Eire

Tanzanite crystal and cut stone
This is a blue variety of the mineral zoisite. Strongly pleochroic, it displays rich blue, magenta and yellowish-grey colours when viewed from different angles

Pyrochlore
Scanning electron microscope images of elemental maps showing thorium, uranium, tantalum and silicon in the mineral pyrochlore from Sokli, Finland

Goyazite
Scanning electron microscope image of the energy-dispersive X-ray spectrum of the mineral goyazite, obtained using Link AN10000 analysis system

Topaz comprises of (aluminum silicate fluoride hydroxide). This is a specimen from the collections of the Natural History Museum, London

Amethyst crystals

Interstellar diamonds
This specimen is known as the Allende meteorite. When viewed under a transmission electron microscope it shows formations of tiny interstellar diamonds

Tarnowitzite, a variety of aragonite
Pale yellowish radiating prisms of aragonite on a matrix. Aragonite comprises of (calcium carbonate). Part of specimen from Tsumeb, Namibia

Scorodite comprises of (hydrated zinc arsenate) and is characterized by brownish-green crystals. Specimen from the collections of the Natural History Museum, London

Russian topaz
Topaz comprises of (aluminum silicate fluoride hydroxide) and is the birthstone of November. Brown topaz specimens from the collections of the Natural History Museum, London

Lazurite comprises of (sodium calcium aluminum silicate sulphur sulphate). Due to its unique rich colour, it is a semi-precious stone and is often used in jewellery making

Cerussite
Aggregates of white crystals on globular crystalline baryte. Cerussite comprises of (lead carbonate). Specimen from Frank Mills mine, Christow, Devon

Libethenite
Wedge-shaped, dark green crystals of libethenite (copper phosphate hydroxide) with pale brown duftite. Specimen from the Phoenix mine, Lnkinhorne, Cornwall

Brownfield (1973) H3. 7 ordinary chondrite
This meteorite fell in Texas in 1937. It has very small chondrules, plus highly-reflective metal and sulphide grains can easily be picked out

Variscite
A rare, bluish green, mineral, found in aluminum-rich rocks. Variscite comprises of (hydrated aluminum phosphate)

Scotlandite comprises of (lead sulphite) and derives from the sulphates group. Specimen from the Natural History Museum, London originally from Leadhills, Lanarkshire, Scotland

Cassiterite
A dark-brown single crystal of cassiterite among quartz. Cassiterite comprises of (tin oxide) and forms ornately faceted crystals with high lustre. Specimen from Turnavore mine, St. Agnes, Cornwall

Volcanic glass, Peles hair
Scanning electron microscope image of a sample of volcanic glass from Mt. Pele, produced to evaluate different types of laser in Laser Ablation Inductively Coupled Plasma Mass Spectrometry

Chalcosine
Dull black twinned crystal with white calcite (schiefer spar). From the Levant mine, St. Just, Cornwall, UK

Diamonds are forever
I m happy

Marble, Africano Sanguigno
Specimen number BM 82628, from the Ruins of Ancient Rome

Cassiterite pseudomorphous after orthoclase
Brown granular cassiterite (tin oxide) have replaced twinned orthoclase crystals. Wheal Coates, St. Agnes, Cornwall

Zircon is the birthstone of December. It comprises of (zirconium silicate) and is not the same as the artificial gem cubic zircona. Crystal specimens are from Nigeria

Pyrope garnet
A cut stone and collection of crystals of pink pyrope garnet (magnesium aluminum silicate). Specimens from the Natural History Museum, London

Gypsum crystals - A desert rose
Gypsum is comprised of (hydrated calcium sulphate). It forms from the evaporation of highly saline waters producing this ornate arrangement of crystals

Metatorbernite
A specimen of the mineral metatorbernite which contains uranium, copper and phosphorus. It is also radioactive

Schultenite comprises of (lead arsenate hydroxide) and derives from the phosphates group. Specimen from the Natural History Museum, London

Schneiderhohnite
A type specimen of Schneiderhohnite, a metallic mineral with thin tabular crystals collected from Tsumeb, Namibia

Copper in unspecified mineral
Scanning electron microscope image of an elemental map showing the distribution of copper (Cu) in mineral samples

All Professionally Made to Order for Quick Shipping