Trace Elements in Black Opal

Bruce Dickson asks some questions about the inclusion of Trace Elements in Lightning Ridge Black opal

Featured
Tully Wollaston
Tully Wollaston

An Extract from Len Cram’s a journey with colour

Read more →
Chemistry Techniques used in researching opal - Neville Curtis
Chemistry Techniques used in researching opal - Neville Curtis
Read more →
A discussion on Ethiopian Opal from our french colleagues.
A discussion on Ethiopian Opal from our french colleagues.

AN article written in French from our colleagues in the French Gemmological Association

Read more →
African Opal Unearthed
African Opal Unearthed

Paul Downings article on Ethiopian Opal

Read more →
Play-of-Colour Opal from Wegel Tena, Wollo Province Ethiopia
Play-of-Colour Opal from Wegel Tena, Wollo Province Ethiopia

A journal article from Gems and Gemmology on the occurrence of Precious opal in Ethiopia

Read more →
The Origin of Digit patterns
The Origin of Digit patterns

AN article regarding the special digit patterns in Ethiopian Gem opal

Read more →
Ethiopia: A new source of Precious Opal
Ethiopia: A new source of Precious Opal
Read more →
WHITE CLIFFS-CRAM
WHITE CLIFFS-CRAM

An excerpt of the history of White Cliffs

Read more →
The White Cliffs Royal Commission
The White Cliffs Royal Commission

The White Cliffs Royal Commission

Read more →
White Cliffs Opal Field- A report by NSW Geological Survey
White Cliffs Opal Field- A report by NSW Geological Survey

Quarterly Notes NSW Geological Survey-White CLiffs

Read more →
White Cliffs Opal Fields a commentary by Gwen Rowe
White Cliffs Opal Fields a commentary by Gwen Rowe

A view of the town of White Cliffs

Read more →
OPAL CARVING-DANIELA L'ABBATE
OPAL CARVING-DANIELA L'ABBATE

Daniela L’Abbate, specialist opal carver.

Read more →
EVALUATION OF CARVED LIGHTNING RIDGE BLACK OPAL
EVALUATION OF CARVED LIGHTNING RIDGE BLACK OPAL

Information and procedures for valuing carved opal

Read more →
HISTORICAL FOLKLORE-KOSMINSKI
HISTORICAL FOLKLORE-KOSMINSKI

An extract of the chapters relating to opal

Read more →
Trace Elements in Black Opal
Trace Elements in Black Opal

A discussion paper form Bruce Dickson regarding trace elements in Australian black opal

Read more →
More on opal and cracking
More on opal and cracking

Boris Chauvire and colleagues elucidate some information regarding opal cracking

Read more →
New information - Slovakian opal
New information - Slovakian opal

An updated article regarding Slovakian Precious opal jewellery

Read more →
Porosity of some opaline siliceous materials
Porosity of some opaline siliceous materials

A discussion on the porosity of siliceous materials including opal

Read more →
The Role of water in the cracking of opal
The Role of water in the cracking of opal

A discussion from the Australian Gemmologist regarding opal cracking

Read more →
AN Historic document: the Occurrence of Opal at Lightning ridge and Grawin.
AN Historic document: the Occurrence of Opal at Lightning ridge and Grawin.

An historical discussion of the geology and occurrence of opal at Lightning Ridge

Read more →
An analysis of Opal Polymorphs: Opal-AG, Opal-AN and Opal-CT by NMR
An analysis of Opal Polymorphs: Opal-AG, Opal-AN and Opal-CT by NMR

An analysis of opal polymorphs by NMR

Read more →
A Review of the mineralogical opal classification
A Review of the mineralogical opal classification

In this Article, Neville Curtis and his colleagues discuss new information regarding the mineralogical varieties of opal

Read more →
SYNTHETIC OPAL
SYNTHETIC OPAL

A micrograph of the pattern so called “lizard skin” of synthetic and imitation opal

Read more →
Trace Elements in Australian Opal-1
Trace Elements in Australian Opal-1

Trace Elements - 1

Read more →
Historical opal literature - an extract from Dana's Mineralogy
Historical opal literature - an extract from Dana's Mineralogy

the following document is an extract of the opal pages from Dana’s Mineralogy

Read more →
An Extract from the Thesis of Boris Chauvrie
An Extract from the Thesis of Boris Chauvrie
Read more →
GILC and LMHC decisions for Hydrophane opal nomenclature
GILC and LMHC decisions for Hydrophane opal nomenclature
Read more →
Opal Historical SA Trade standards (1979)
Opal Historical SA Trade standards (1979)

The article in this issue of the Australian Gemmologist was for its time a ”land breaking” discussion on opal nomenclature.

Read more →
Opal Nomenclature - AG1997
Opal Nomenclature - AG1997

The article in this issue of the Australian Gemmologist was for its time a ”land breaking” discussion on opal nomenclature.

Read more →
The Story of European Precious opal from Dubnik
The Story of European Precious opal from Dubnik
Read more →
Anthony Smallwood