More on opal and cracking

Boris Chauvire and his colleagues update and discuss the cracking of opal from a European perspective

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