Gemstone Collection (page 7)

Carved nephrite
A tiki from New Zealand (left), a seal from British Colombia, and a Chinese vase all carved from nephrite. Nephrite is actually not a mineral outright, but is a variety of the mineral actinolite

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

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

Demantoid garnet cut stone
Demantoid is a variety of andradite garnet. It is green in colour, sometimes with yellow shading

Faceted chrysoberyl
Two cut stones of the gemstone chrysoberyl (beryllium aluminum oxide). This stone is also known as cats eyes

Brown and blue zircons
Natural brown and heat-treated blue zircons. Zircon comprises of (zirconium silicate) and is not the same as the artificial gem cubic zircona

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

Zircon crystal
Zircon comprises of (zirconium silicate) and is not the same as the artificial gem cubic zircona. Specimen is from Norway

Garnet cut stones
Grossular (calcium aluminum silicate) and demantoid cut gems resting on andradite (calcium iron silicate) crystals. All of which are types of garnet

Quartz box and carved lizard
An ornamental box set with different quartz stones (silicon dioxide) including a large central citrine together with a carved lizard in cat s-eye quartz

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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