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

Thaumasite

1.467

1.51

0.03

0.038

1.88

1.9

Black Rock mine, South Africa

1.467

1.480

1.505

1.510

The Journal of Gemmology 1991 Vol 22, No 6 p334-336

Thaumasite

1.467

1.51

0.03

0.038

1.88

1.91

colourless to pale yellowish

1.467

1.480

1.505

1.510

Zeitschrift der Deutschen Gemmologischen Gesellschaft 1991 Apr, p67-68

Thaumasite

1.47

1.515

0.045

0.045

1.9

1.9

colourless

1.72ct, radiating fibrous inclusions, reflective films, tiny crystal inclusions

inert

inert

Gems & Gemology 2017 Spring, p90

Stone

RI min

RI max

Biref min

Biref max

Dens min

Dens max

ne min

ne max

no min

no max

Reference

Thaumasite

1.457

1.508

0.034

0.038

1.87

1.93

Gemmo.eu 2017

Thaumasite

1.458

1.47

0.036

0.036

1.9

1.9

1.458

1.470

1.498

1.507

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

Thaumasite

1.464

1.507

0.036

0.036

1.91

1.91

http://www.gemmology.be 

Thaumasite

1.464

1.507

0.036

0.036

1.91

1.91

1.464

1.468

1.500

1.507

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Thaumasite

1.464

1.507

0.036

0.036

1.91

1.91

1.464

1.468

1.500

1.507

http://www.geminterest.com 

Thaumasite

1.464

1.5

0.031

0.043

1.88

1.9

1.500

1.507

1.464

1.468

Gems, R Webster, 5th edition 1994 

Thaumasite

1.464

1.511

0.03

0.038

1.87

1.91

1.464

1.480

1.500

1.511

Bestimmungstabellen für Edelsteine, Birgit Günther, 2008 

Thaumasite

1.464

1.507

0.036

0.036

1.9

1.91

1.464

1.468

1.500

1.507

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

Thaumasite

1.464

1.507

0.036

0.036

1.91

1.91

Gemology Tools Professional 2010

Thaumasite

1.467

1.505

0.038

0.038

1.9

1.9

1.467

1.467

1.505

1.505

Gemmological Tables, Ulrich Henn, 2004 

STONE

LOCALITIES

REFERENCE

Thaumasite

Black Rock Mine

Kuruman, Kalahari

Northern Cape Province

South Africa

Gems & Gemology 1991 Summer p 131