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Six cuprian liddicoatite tourmalines
Cuprian Liddicoatite Tourmaline

Identifies 13 copper-bearing tourmalines, which have traditionally been assumed to be elbaite species, as liddicoatite.

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15 ct tanzanite
Pleochroism in Faceted Gems: An Introduction

Describes the phenomenon of pleochroism and its complex effect on the appearance of coloured stones.

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Mt. Mica: a renaissance in Maine’s gem tourmaline production

The Mt. Mica area in southwestern Maine has been mined for tourmaline and other pegmatite gems since the 1820s.

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Liddicoatite Tourmaline from Anjanabonoina, Madagascar

Liddicoatite, a calcium-rich lithium tourmaline, was recognised as a separate mineral species in 1977, and named in honour of Richard T. Liddicoat.

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An Update on “Paraíba” Tourmaline from Brazil

“Paraíba” tourmalines continue to be recovered in small amounts from north-eastern Brazil.

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Multicoloured Bismuth-bearing Tourmaline from Lundazi, Zambia

Tourmalines from an alluvial deposit near Lundazi in Zambia consist of colour-zoned pink/colourless/yellow-green “watermelon” nodules.

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Copper and tenorite inclusions in cuprian-elbaite tourmaline from Paraíba, Brazil

Inclusions of native copper and tenorite (CuO) were found in greyish-green elbaite from São José da Batalha, Paraíba, Brazil.

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Gem-quality cuprian-elbaite tourmalines from São José Da Batalha, Paraíba, Brazil

Unusually vivid tourmalines from the state of Paraiba, in north-eastern Brazil, have attracted great interest since they first appeared on the international gem market in 1989.

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Gemstone Durability: Design to Display

A treatise on the design, display, care and repair of fine gemstones.

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"Modern" Jewellery: Retro to Abstract

A review of mid-20th century jewellery styles.

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