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INVESTIGATIONS

Stone

RI min

RI max

Biref min

Biref max

Dens min

Dens max

Colour

Location

Info

ne min

ne max

no min

no max

Spectrum

UVS

UVL

Reference

Phenakite

1.648

1.664

0.016

0.016

2.959

2.959

colourless

Franquiera, Spain

transparent

1.664

1.664

1.648

1.648

 

 

 

The Journal of Gemmology 1997 Vol 25, N°5, p340-357

Phenakite

1.65

1.665

0.015

0.015

2.97

2.97

 

Minas Gerais, Brazil

33.15ct

 

 

 

 

 

inert

inert

GIA Gem Database  34089

Phenakite

1.65

1.667

0.017

0.017

2.97

2.97

colourless

Sri Lanka

0.48ct

 

 

 

 

 

pink

violet-red

ACAM Lab  2297

Phenakite

1.65

1.668

0.017

0.018

2.96

2.97

 

Zambia

0.45ct, 1.09ct

1.650

1.651

1.668

1.668

 

 

 

ACAM Lab  888

Phenakite

1.651

1.668

0.017

0.017

2.97

2.97

colourless

Russia

15.53ct

 

 

 

 

 

inert

very weak green

GIA Gem Database  34094

Phenakite

1.652

1.667

0.015

0.015

2.92

2.92

yellowish-brown

 

2.84ct, irradiated

1.667

1.667

1.652

1.652

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 1996 Dec, p156

Phenakite

1.654

1.67

0.016

0.016

2.95

2.95

colourless, light yellow

Momeik (Molo) , Mogok, Myanmar

 

 

 

 

 

 

weak yellow

weak yellow

The Australian Gemmologist 2005 22, p303-309

Phenakite

1.654

1.67

0.016

0.016

2.93

3

colourless, white, pale yellow

Tokovaia, Ural Mts, Russia

 

 

 

 

 

 

 

 

The Journal of Gemmology 1997 Vol 25, N°5, p355

Phenakite

1.654

1.67

0.016

0.016

2.96

2.96

light brownish yellow

 

7.03, 8.98, and 50.36ct, cat's-eye

 

 

 

 

 

 

 

Gems & Gemology 2009 Fall, p223

Phenakite

1.66

1.66

 

 

2.96

2.96

colourless

Sri Lanka

38.34 ct, cat's-eye, spot RI

 

 

 

 

 

inert

inert

Gems & Gemology 2009 Winter, p291-292

 

TABLES

Stone

RI min

RI max

Biref min

Biref max

Dens min

Dens max

ne min

ne max

no min

no max

Reference

Phenakite

1.637

1.696

0.016

0.016

2.85

3

1.666

1.696

1.637

1.654

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

Phenakite

1.649

1.672

0.015

0.02

2.89

3.02

 

 

 

 

Gemmo.eu 

Phenakite

1.65

1.696

0.016

0.016

2.9

3

 

 

 

 

Gemology Tools Professional 2010

Phenakite

1.651

1.67

0.016

0.019

2.92

2.94

1.669

1.670

1.651

1.654

Gemmological Tables, Ulrich Henn, 2004 

Phenakite

1.651

1.696

0.016

0.02

2.95

2.97

1.666

1.696

1.651

1.671

Tabellen zur Edelstein-Bestimmung, Pschichholz FGA, 1975 

Phenakite

1.653

1.67

0.015

0.015

2.9

3.01

1.670

1.670

1.653

1.655

http://www.geminterest.com 

Phenakite

1.654

1.67

0.015

0.016

2.95

3

 

 

 

 

John Sinkakas, Gemstone and mineral data book,1972 

Phenakite

1.654

1.696

0.016

0.016

2.94

2.96

1.666

1.696

1.654

1.654

Bestimmungstabellen für Edelsteine, Birgit Günther, 1981 

Phenakite

1.654

1.67

0.015

0.016

2.93

3

 

 

 

 

http://www.gemmology.be 

Phenakite synthetic

1.654

1.67

0.015

0.016

2.95

3

 

 

 

 

http://www.gemmology.be 

Phenakite

1.654

1.67

0.016

0.016

2.93

3

1.670

1.670

1.654

1.654

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Phenakite

1.654

1.67

0.016

0.016

2.95

2.97

 

 

 

 

Gems, R Webster, 5th edition 1994 

Phenakite

1.654

1.67

0.016

0.016

2.95

3

 

 

 

 

Gems, R Webster, 5th edition 1994 

Phenakite

1.654

1.67

0.016

0.016

2.93

3

 

 

 

 

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

 

CAUSE OF COLOUR

 

MINERAL INCLUSIONS

Inclusion

Stone

Reference

aikinite

Phenakite

Joel Arem, Color Encyclopedia of Gemstones, 1987

mica

Phenakite

Joel Arem, Color Encyclopedia of Gemstones, 1987

molybdenite

Phenakite

https://www.gemmo.eu/fr/

perettiite-Y

Phenakite

www.gemresearch.ch

rutile

Phenakite

www.gemintrest.com

 

LOCALITIES

STONE

LOCALITIES

REFERENCE

Phenakite

Kilosa, 80 km west of Morogoro

 

 

Tanzania

Gemmologie, 1997, Mar, p31







 

CHEMICAL DATA (%)

Stone

Colour

Locality

Reference

SiO2

Al2O3

MnO

MgO

FeO

TiO2

CaO

Na2O

Cr2O3

V2O3

NiO

Phenakite

colourless

Franqueira

Spain

The Journal of Gemmology 1997, Vol 25, N°5 p 352

57.11

0.01

0.04

0.01

0.02

0.01

0.02

0.01

0.01

0.02

0.01