Cyclosilicate Collection (page 2)

Chrysoberyl
Shown here is a crystal and a cut stone of chrysoberyl (beryllium aluminum oxide). Chrysoberl is a gemstone and is also known as cats eye

Imitation emerald
A faceted teardrop synthetic emerald

Pink rubellite tourmaline
Chinese pendant carving in pink rubellite tourmaline

Emerald on calcite
Well-formed hexagonal crystals of emerald on calcite. Emerald is a variety of beryl (beryllium aluminum silicate). The green colour is attributed to small amounts of chromium

Beryl
Deposits of the green variety of beryl (beryllium aluminum silicate) known as emerald. Specimens oginally from Ekatrinberg, Russia, now at the Natural History Museum, London

Beryl
A specimen of beryl (beryllium aluminum silicate). There are several varieties of beryl, aquamarine (blue), emerald (green), goshenite, heliodor and morganite

Emerald, a variety of beryl
A cut teardrop stone and a prismatic crystal of the green variety of beryl (beryllium aluminum silicate) known as emerald. Specimen from the Natural History Museum, London

Tourmaline
A specimen of the mineral and gemstone tourmaline from Itambacury Theophilo Ottoni, Minas Gerais, Brazil

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

Beryl
From left to right, different varieties of berly (beryllium aluminum silicate) cut stone; emerald, aquamarine, morganite and heliodor

Cordierite variety Iolite
It is famous for its pleochroism, appearing intense blue in one direction but becoming almost colourless as the stone is turned. Cut stone, faceted girdle, 19.69 ct

A group of feldspar specimens
Amazonstone crystals and gems, pin set with sunstone, and moonstones. The feldpars are significant rock building minerals

Tourmaline crystal
A bi-coloured pink and green tourmaline crystal from California

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