Hydrated Collection

Opal gem with opal rock
The polished gem is from an unknown locality while the rough specimen of opal rock comes from Baracoo River, Queensland, Australia

Limonite, also known as ironstone, is comprised of (hydrated iron oxide) and is characterized by its rusty colour and banded appearance

Turquoise variety Henwoodite
A specimen of the turquoise variety called Henwoodite, named after William Jory Henwood (1805-1875) from West Phoenix Mine, Linkinhorne, Cornwall

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

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

Opals are not truely crystalline and are therefore mineraloids. They comprise of (hydrated silica glass). Specimen from Queensland, Australia

Opal
A cut stone and crystal of opal. Opals are not truely crystalline and are therefore mineraloids. They comprise of (hydrated silica glass)

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

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

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

Opal

Goethite comprises of hydrated iron oxide. Picture shows radiating bands within the disc-shaped crystals. This specimen is displayed at the Natural History Museum, London

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

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

Kernite is composed of hydrated sodium borate hydroxide with transparent crystals. Kernite is also an important ore of borax. Specimen from the Natural History Museum, London

Erythrite
Erithrite comprises of (hydrated cobalt arsenate) and is characterized by its striking red-purple colouration and needle-like fibrous crystals

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

Opal
Play of colour in opal (opalescence). Opals are not truely crystalline and are therefore mineraloids. They comprise of (hydrated silica glass)

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

Precious opal
A Cameo representing the dawn, on a limonitic matrix from Australia. Opals are not truely crystalline and are therefore mineraloids. They comprise of (hydrated silica glass)

Torbernite

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

Opal
Fire opal in a matrix slab of alunite from Guatemala. Opals are not truely crystalline and are therefore mineraloids. They comprise of (hydrated silica glass)

Opal
Boulder or nodular opal in a sandstone matrix from Queensland, Australia. Opals are not truely crystalline and are therefore mineraloids. They comprise of (hydrated silica glass)

Liroconite comprises of (hydrated copper aluminum arsenate hydroxide). It is blue in colour and forms from the oxidation of copper ores. Specimen from the collections of the Truro Museum, Cornwall

Mesolite is comprised of (hydrated sodium calcium aluminum silicate). Its needle-like crystals formed inside a gas bubble in cooling volcanic rock

Hemimorphite crystals enclosed in rock crystal
Hemimorphite, formerly known as calamine is comprised of (hydrated zinc silicate hydroxide). Magnification = x1.2

Turquoise vein in shale
Turquoise (hydrated copper aluminum phosphate) vein in shale, from Victoria, Australia. Turquoise is perhaps the most valuable non-transparent mineral

A collection of turquoise specimens
Rough, polished and worked specimens of turquoise (Hydrated Copper Aluminum Phosphate). Turquoise is perhaps the most valuable of the non-transparent minerals

Turquoise
Four different examples of worked turquoise. Turquoise (hydrated copper aluminum phosphate) is perhaps one of the most valuable non-transparent minerals

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