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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

Clinohumite

1.62

1.648

0.028

0.029

3.21

3.21

greenish yellow

Tanzania

 

1.620

1.620

 

 

1.648

1.649

weak absorption at 490nm

very weak yellow

inert

Gems & Gemology 2007 winter,p377

Clinohumite

1.628

1.658

0.03

0.03

3.23

3.23

brown

Tanzania

1.72ct

1.628

1.628

1.638

1.638

1.658

1.658

 

inert

inert

ACAM lab  2116

Clinohumite

1.63

1.668

0.038

0.038

3.18

3.18

brownish yellow

Russia

0.5 ct

 

 

 

 

 

 

none

very strong orangy yellow

inert

Gems & Gemology 1988 Spring p 47-48

Clinohumite

1.63

1.669

0.039

0.039

3.19

3.19

bright yellow to orange or brownish-orange

Pamir Mts, Tajikistan

high iron and low Ti content

1.630

1.630

1.648

1.648

1.669

1.669

 

moderate to strong chalky-orange

inert

The Journal of Gemmology 2001 Vol 27, N°6, p335-339

Clinohumite

1.63

1.665

0.031

0.033

3.223

3.23

 

Russia

3 to 4.59ct

1.630

1.633

1.644

1.644

1.662

1.665

 

 

 

The Journal of Gemmology 1984 Vol 19, N°2, p115-119

Clinohumite

1.631

1.668

0.037

0.037

3.18

3.18

brownish orange

 

 

1.631

1.631

1.642

1.642

1.668

1.668

none

moderate to strong slightly chalky orange yellow

inert

Zeitschrift der Deutschen Gemmologischen Gesellschaft 1988 37, Nr 1/2, p53-55

Clinohumite

1.631

1.668

0.037

0.037

3.18

3.18

 

 

 

1.631

1.631

1.642

1.642

1.668

1.668

 

strong chalky orangy yellow

inert

Gems & Gemology 1986 winter, p236

Clinohumite

1.632

1.666

0.033

0.034

3.21

3.23

 

Pamir Mts, Tajikistan

2 stones

1.632

1.632

 

 

1.665

1.666

general absorption at 430nm

moderate to strong orange-yellow

inert

Gems & Gemology 2004 winter, p338

Clinohumite

1.632

1.666

0.034

0.034

3.17

3.17

yellow-brown

 

0.46ct

1.632

1.632

1.638

1.638

1.666

1.666

 

orange-yellow

inert

ACAM lab  4156

Clinohumite

1.635

1.66

0.025

0.025

3.21

3.21

yellowish orange

Pamir Mts, Gorno-Badakshan Province, Tajikistan

1.52ct

 

 

 

 

 

 

 

moderate yellowish orange

inert

GIA Gem Database  35433

Clinohumite

1.635

1.67

0.035

0.035

3.21

3.21

brownish orange

unknown

84.23ct

 

 

 

 

 

 

 

moderate orange to strong chalky yellow

inert

Gems & Gemology 2011 Fall, p222

Clinohumite

1.635

1.667

0.032

0.032

3.22

3.22

yellow

 

0.24ct

1.635

1.635

1.648

1.648

1.667

1.667

 

 

 

ACAM lab  2066

Clinohumite

1.64

1.671

0.031

0.031

3.35

3.35

red-brown

Kotui River, Taymyr, Siberia, Russia

up to 2 ct

1.640

1.640

1.654

1.654

1.671

1.671

 

inert

inert

The Journal of Gemmology 2001 Vol 27, N°6, p335-339

Clinohumite

1.646

1.67

0.024

0.024

3.21

3.21

brownish orange

 

transparent

 

 

 

 

 

 

cutoff 430nm

strong orange-yellow

inert

The Journal of Gemmology 2007 30, 5/6, p303-306

 

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

Clinohumite - low Fe%

1.62

1.668

0.024

0.037

3.15

3.35

1.620

1.638

1.636

1.636

1.648

1.668

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

Clinohumite

1.62

1.73

0.022

0.038

3.15

3.35

 

 

 

 

 

 

Gemmo.eu 

Clinohumite

1.623

1.651

0.024

0.036

3.18

3.18

1.625

1.632

1.636

1.647

1.659

1.668

Gems, R Webster, 5th edition 1994 

Clinohumite - low Fe%

1.623

1.667

0.024

0.037

3.13

3.35

1.623

1.632

 

 

1.651

1.667

Bestimmungstabellen für Edelsteine, Birgit Günther, 2008 

Clinohumite

1.625

1.698

0.027

0.037

3.07

3.35

1.623

1.664

 

 

1.651

1.698

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

Clinohumite

1.625

1.671

0.024

0.039

3.18

3.35

1.625

1.640

1.636

1.654

1.653

1.671

Gemmological Tables, Ulrich Henn, 2004 

Clinohumite

1.627

1.674

0.028

0.041

3.17

3.35

1.627

1.638

1.639

1.643

1.661

1.674

http://www.geminterest.com 

Clinohumite

1.629

1.674

0.028

0.041

3.17

3.35

1.629

1.638

1.662

1.643

1.662

1.674

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Clinohumite

1.629

1.674

0.028

0.041

3.17

3.35

 

 

 

 

 

 

http://www.gemmology.be 

Clinohumite

1.629

1.674

0.028

0.041

3.17

3.35

1.629

1.638

1.662

1.643

1.662

1.674

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

Clinohumite - high Fe%

1.664

1.698

0.034

0.034

3.13

3.18

 

 

 

 

 

 

Bestimmungstabellen für Edelsteine, Birgit Günther, 2008 

Clinohumite - high Fe%

1.664

1.698

0.034

0.034

3.15

3.35

 

 

 

 

 

 

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

 

CAUSE OF COLOUR

 

MINERAL INCLUSIONS

 

LOCALITIES

 

CHEMICAL DATA

Stone

Colour

Locality

Reference

SiO2

Al2O3

MnO

MgO

FeO

TiO2

CaO

K2O

H2O

F

Clinohumite

 

 

Russia

Zeitschrift der Deutschen Gemmologischen Gesellschaft, 1988, 37, Nr 1/2, 54

37.52

 

 

57.45

0.22

2.5

 

 

 

2.8

Clinohumite

orange

Pamir Mts

Tajikistan

The Journal of Gemmology 2001, Vol27, N°6, p337

37.47

 

0.02

57.12

0.25

2.54

0.01

 

 

2.25

Clinohumite

greenish yellow

 

Tanzania

Gems & Gemology winter 2007, p 377-378

37.57

0.18

 

58.39

0.31

0.42

 

0.02

2.41

1.01

Clinohumite

brown-red

Taymyr region, Siberia

Russia

The Journal of Gemmology 2001, Vol27, N°6, p337

37.05

 

0.49

53.19

5.48

0.77

0.03

 

 

2.18