Glassy 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

Benitoite was discovered in 1906 near the San Benito river in California which remains the only known locality for this (barium titanium silicate) mineral

Clouded bemastistes, glassy acraea and white
Clouded bemastistes, Bematistes umbra 1, 2, common glassy acraea, Acraea quirina 3, 4, and white acraea, Acraea circeis 5, 6. Handcoloured lithograph from John O

Glazed octagonal tiles. 13th-14th centuries. Tiled Kiosk Museum. Archaeological Museum. Istanbul. Turkey

Opal

Realgar comprises of (arsenic sulphide). It is also known as ruby sulphur and is a rare non-metallic sulphide mineral. Specimen from the Natural History Museum, London

Celestite
A mass of celestite crystals. Celestite is strontium sulphate and is the source of red colours in fireworks

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

Opal
Play of colour in opal (opalescence). 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)

Moodstone cut as cabochons. A cabachon is a highly polished convex-cut gem

Flint nodule
This flint nodule originates from the Cretaceous rocks of the North Downs, England

Chrysoberyl cats eyes
Two stones of Chrysoberyl (beryllium aluminum oxide), illustrating the similarity the gemstone has with a cats eye

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