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

Powellite

4.17

4.22

yellowish green, transparent to translucent

Inca de Oro copper mine, Atacama Desert, Chili

sometimes called "chrome-powellite" (but there is no Cr!)

cutoff 460

bright yellow

inert

Gems & Gemology 2001 fall p235

Powellite

colourless, transparent

India

0.16ct

strong greenish white

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2008 Dec, p116

Powellite

4.28

4.28

yellowish orange

India

31.53ct

strong greenish yellow

moderate yellow

GIA Gem Database  35623

Synthetic Powellite

1.974

1.984

4.34

4.34

pink

0.42 ct

green

green

The Journal of Gemmology 1972 N°1, p7

Stone

RI min

RI max

Biref min

Biref max

Dens min

Dens max

ne min

ne max

no min

no max

Reference

Powellite synthetic

1.924

1.984

4.34

4.34

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Powellite synthetic

1.924

1.984

0.06

0.06

4.34

4.34

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

Powellite

1.965

1.98

0.01

0.012

4.15

4.5

Gemmo.eu 2017

Powellite

1.967

1.985

0.011

0.011

4.23

4.28

http://www.gemmology.be 

Powellite

1.967

1.985

0.011

0.011

4.23

4.28

1.978

1.985

1.967

1.974

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Powellite

1.967

1.985

0.011

0.011

4.23

4.28

1.978

1.985

1.967

1.974

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

Powellite

1.974

1.985

0.011

0.012

4.2

4.3

1.978

1.985

1.967

1.974

http://www.geminterest.com 

Powellite

1.974

1.984

0.01

0.01

4.34

4.34

Gems, R Webster, 5th edition 1994 

Powellite

1.974

1.984

4.23

4.23

Michael O'Donoghue, Gems: Their Sources, Descriptions and Identification (2006),  873pp 

STONE

LOCALITIES

REFERENCE

Powelliet

Jardinera No. 1 Mine, Inca de Oro

Chanaral Province

Atacama

Chili

Gems & Gemology 2001 fall p235