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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

Calcite

1.48

1.63

0.15

0.15

2.71

2.71

blue

Myanmar

cat's eye, cabochon, 19.96 ct, translucent

 

 

 

 

 

 

 

ACAM lab  967

Calcite

1.48

1.66

0.18

0.18

2.65

2.65

yellowish white to a deeper brownish yellow

 

beads, spot RI

 

 

 

 

 

 

 

Gems & Gemology 1986 Spring, p46-47

Calcite

1.48

1.66

0.18

0.18

2.72

2.72

light green, translucent

Pakistan

cabochon, cat's-eye, 57,60 ct

 

 

 

 

 

inert

inert

Gems & Gemology 2015 Summer, p199-200

Calcite

1.488

1.659

0.171

0.171

2.75

2.75

brownish-orange

Erongo, Namibia

3.03ct

 

 

 

 

 

white

white

http://www.spec4gem.info/index.php 2016

Calcite

1.49

1.658

0.168

0.168

2.75

2.75

purplish red (cobaltocalcite)

Spain

7.93ct

 

 

 

 

broad absorption below 420nm

weak yellow

weak orangy yellow

GIA Gem Database  35428

Calcite

1.49

1.65

 

 

2.73

2.73

orangy-red

 

10.45ct, cabochon, coloured by chalcotrichite inclusions, spot RI

 

 

 

 

Lines at 500, 590, and 610 nm

weak, moderately chalky reddish orange

weak red

Gems & Gemology 1998 Fall, p127

Calcite

1.49

1.66

0.17

0.17

2.7

2.7

reddish purple, purplish pink (cobaltocalcite)

 

 

 

 

 

 

 

inert

very weak purplish pink, moderate orangy pink

Gems & Gemology 2015 Spring, p58-59

Calcite

1.493

1.655

0.162

0.162

2.76

2.76

red-purple

Spain

6.21ct, translucent

 

 

 

 

broad absorption below 420 and between 520-560nm, line at 485

inert

weak violet

GIA Gem Database  35429

Calcite

1.52

1.658

0.138

0.138

2.72

2.72

very light yellowish orange

Mexico

23.58ct

 

 

 

 

 

inert

inert

GIA Gem Database  35415

Calcite

1.56

1.56

 

 

2.72

2.72

green and orangy yellow

Baluchistan, Pakistan

16.77 ct green cabochon, 32.06 ct orangy cabochon, spot RI, large Biref blink

 

 

 

 

 

orangy: yellow, green : inert

orangy: yellow, green : inert

Gems & Gemology 2012 Fall, p217-218

 

TABLES

Stone

RI min

RI max

Biref min

Biref max

Dens min

Dens max

ne min

ne max

no min

no max

Reference

Calcite

1.484

1.66

0.154

0.174

2.65

2.75

 

 

 

 

Gemmo.eu

Calcite

1.486

1.658

0.172

0.172

2.71

2.71

 

 

 

 

John Sinkakas, Gemstone and mineral data book,1972 

Calcite

1.486

1.658

0.172

0.172

2.69

2.71

 

 

 

 

Bestimmungstabellen für Edelsteine, Birgit Günther, 1981 

Calcite

1.486

1.74

0.172

0.19

2.7

2.72

1.486

1.552

1.658

1.740

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

Calcite

1.486

1.658

0.172

0.172

2.71

2.71

1.486

1.486

1.658

1.658

Gemmological Tables, Ulrich Henn, 2004 

Calcite

1.486

1.74

0.172

0.19

2.71

2.94

 

 

 

 

http://www.gemmology.be 

Calcite

1.486

1.658

0.172

0.172

2.7

2.72

 

 

 

 

Tabellen zur Edelstein-Bestimmung, Pschichholz FGA, 1975 

Calcite

1.486

1.74

0.14

0.19

2.6

2.8

1.486

1.550

1.650

1.740

http://www.geminterest.com 

Calcite

1.486

1.74

0.172

0.19

2.71

2.94

1.486

1.550

1.658

1.740

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Calcite

1.486

1.658

 

 

2.71

2.71

 

 

 

 

Gems, R Webster, 5th edition 1994 

Calcite

1.486

1.74

0.172

0.19

2.71

2.94

1.486

1.550

1.658

1.740

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

Calcite

1.486

1.658

0.172

0.172

2.65

2.75

 

 

 

 

Gemology Tools Professional 2010

 

CAUSE OF COLOUR

Stone

Colour

Cause of colour

Reference

Calcite

blue, amber

natural radiation

http://minerals.caltech.edu

Calcite

pink

Co²+

Gems & Gemology Summer 1988

Calcite

pink

Co²+ in octahedral coordination

Alain Abréal, juillet 2002

 

MINERAL INCLUSIONS

Inclusion

Stone

Reference

boulangerite

Calcite

www.mindat.org

conichalcite

Calcite

E.J. Gübelin and J.I. Koivula, Photoatlas of inclusions in Gemstones, volume 2 (2005)

copper

Calcite

www.mindat.org

cuprite

Calcite

Gems & Gemology 1998 Fall, p127

dioptase

calcite

The Journal of Gemmology 1994, 24, 1, p46

polydymite

Calcite

www.mindat.org

realgar

Calcite

http://www.johnbetts-fineminerals.com

tourmaline

Calcite

Dietrich, The tourmaline group, 1985

 

LOCALITIES

STONE

LOCALITIES

REFERENCE

Calciet

Ihosy, Ihosy Department

Horombe Region

Fianarantsoa Province

Madagascar

Gemmologie, Dez 1999,p196







 

CHEMICAL DATA