Mineraloid 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

Opal in its natural form. The boulder has been split open to reveal the shimmering opal inside

Black opal
131-carat black opal found in the Lightning Ridge area of New South Wales, Australia

Opalised snails and clam
Found in the South Australia town of Coober Pedy, these ancient snail and clam shells have been preserved in semi-precious opal

Opal necklace given to the museum in 1958

Birthstone Series: Fire Opal
This specimen is called a fire opal because of its red-orange colour. Many of these specimens originate from Mexico. Opal is the birthstone for the month of October. Photographed by Harry Taylor

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

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

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)

Opal

Petrified conifer trunk
Containing precious opal, width approx. 10 cm, discovered at White Cliffs, New South Wales, Australia. Dates back to the Late Cretaceous period

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

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)

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 in matrix specimen

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)

Labradorite carving

Opal doublets
Opals are not truely crystalline and are therefore mineraloids. They comprise of (hydrated silica glass)

Black Opal cabochon
A specimen of black opal cabochon from Wallangulla, Queensland, Australia. Opal is not a single crystal, but is made up of tiny spheres of silica

Fluorescent group
A group including amber, ruby, ivory, fluorite and opal photographed in ultra violet light. See 179 for the same group in white light

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