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INVESTIGATIONS

Stone

RI min

RI max

Biref min

Biref max

Dens min

Dens max

Colour

Locality

Info

nx min

nx max

ny min

ny max

nz min

nz max

Spectrum

UVS

UVL

Reference

Microcline

1.516

1.529

0.007

0.01

2.56

2.6

blue to bluish green (amazonite)

Penoles pegmatite, Chihuahua, Mexico

 

1.516

1.520

1.518

1.525

1.525

1.529

 

inert

yellow-green

Gems & Gemology 2007 Summer, p163-164

Microcline

1.518

1.525

0.007

0.007

2.57

2.57

bluish green (amazonite)

Koppio district, South Australia

 

1.518

1.518

1.522

1.522

1.525

1.525

 

inert

inert

The Australian Gemmologist 1985 August, p 404-408

 

TABLES

Stone

RI min

RI max

Biref min

Biref max

Dens min

Dens max

nx min

 nx max

ny min

ny max

nz min

nz max

Reference

Microcline

1.513

1.54

0.005

0.012

2.53

2.64

 

 

 

 

 

 

Gemmo.eu 2013

Microcline

1.514

1.539

0.008

0.008

2.54

2.63

1.514

1.529

 

 

1.521

1.539

Gemme, Dati per l'identificazione, P. De Stefano et al, 1993 

Microcline

1.514

1.539

0.004

0.007

2.54

2.63

 

 

 

 

 

 

http://www.gemmology.be 

Microcline

1.514

1.539

0.005

0.01

2.5

2.7

1.514

1.529

1.518

1.533

1.521

1.539

http://www.geminterest.com 

Microcline

1.514

1.539

0.007

0.01

2.54

2.63

1.514

1.529

1.518

1.533

1.521

1.539

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Microcline

1.514

1.539

0.007

0.01

2.54

2.63

1.514

1.529

 

 

1.521

1.539

Tables of Gemstone Identification, Roger Dedeyne, Ivo Quintens, 2007 

Microcline

1.518

1.534

0.008

0.008

2.53

2.58

 

 

 

 

 

 

Gemology Tools Professional 2010

Microcline

1.522

1.53

0.008

0.008

2.55

2.57

 

 

 

 

 

 

Bestimmungstabellen für Edelsteine, Birgit Günther, 1981 

Microcline

1.522

1.53

0.008

0.008

2.54

2.58

 

 

 

 

 

 

Tabellen zur Edelstein-Bestimmung, Pschichholz FGA, 1975 

Microcline

1.522

1.53

0.008

0.008

256

2.58

 

 

 

 

 

 

Gems, R Webster, 5th edition 1994 

Microcline

 

 

0.008

0.008

2.54

2.55

 

 

 

 

 

 

John Sinkakas, Gemstone and mineral data book,1972 

 

CAUSE OF COLOUR

Stone

Colour

Cause of colour

Reference

amazonite-Microcline

green

colour center involving Pb³+ and structural water (Pb²+ substituting two K+ atoms, irradated to Pb³+;only possible when H2O is bounded to the structure)

Gems & Gemology Summer 1988

 

MINERAL INCLUSIONS

 

LOCALITIES

amazonite-Microcline

 

 

 

Australia

Gemmologie 4 Dec 2001 p182

amazonite-Microcline

 

 

Minas Gerais

Brazil

Gemmologie 4 Dec 2001 p182

amazonite-Microcline

 

 

Ontario

Canada

Gemmologie 4 Dec 2001 p182

amazonite-Microcline

 

 

Québec

Canada

Gemmologie 4 Dec 2001 p182

amazonite-Microcline

 

 

 

Madagascar

Gemmologie 4 Dec 2001 p182

amazonite-Microcline

Departementa Ambositra

Amoron'i Mania region

Fianarantsoa Province

Madagascar

Gemmologie, Dez 1999,p196

amazonite-Microcline

Kandreho area, Maevatanana District

Betsiboka Region

Mahajanga (Majunga) Province

Madagascar

Gemmologie, Dez 1999, p196

amazonite-Microcline

Mahabo Commune, Betroka District

Anosy (Fort Dauphin) Region

Tuléar (Toliara) Province

Madagascar

Gemmologie, Dez 1999,p196

amazonite-Microcline

Dierra de Penoles

Allende

Chihuahua

Mexico

Gems & Gemology summer 2007 p163-164

amazonite-Microcline

 

 

Kola

Russia

Gemmologie 4 Dec 2001 p182

amazonite-Microcline

 

 

Ural Region

Russia

Gemmologie 4 Dec 2001 p182

amazonite-Microcline

 

 

 

South-Africa

Gemmologie 4 Dec 2001 p182

amazonite-Microcline

 

 

 

Tanzania

Gemmologie 4 Dec 2001 p182

amazonite-Microcline

Pike's Peak

El Paso County

Colorado

USA

American Mineralogist, Vol. 85, pp. 1275-1286, 2000.

amazonite-Microcline

 

 

Virginia

USA

Gemmologie 4 Dec 2001 p182

 

CHEMICAL DATA (%)