|
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 |
Friedelite |
1.63 |
1.657 |
0.027 |
0.027 |
3.063 |
3.069 |
rose red, carmine red |
Kalahari Manganese Field, Kuruman, South Africa |
only cryptocrystalline, chelsea: vivid red |
1.630 |
1.630 |
1.657 |
1.657 |
band ferom 535 to 595nm, general absorption from 400 to 480nm |
inert |
inert |
Gems & Gemology 1982 Winter p221-224 |
Friedelite |
1.65 |
|
|
|
3.04 |
3.19 |
orange red |
|
approximate RI, aggregate, translucide |
|
|
|
|
|
|
|
Zeitschrift der Deutschen Gemmologischen
Gesellschaft 2018 67/1-2 p5-7 |
TABLES (friedelite=monoclinic !
pseudo-uniaxial)
Stone |
RI min |
RI max |
Biref min |
Biref max |
Dens min |
Dens max |
ne min |
ne max |
no min |
no max |
Reference |
Friedelite |
1.618 |
1.658 |
0.028 |
0.036 |
3 |
3.1 |
|
|
|
|
Gemmo.eu 2019 |
Friedelite |
1.62 |
1.664 |
0.029 |
0.035 |
3.04 |
3.19 |
1.620 |
1.629 |
1.654 |
1.664 |
Tables of Gemstone Identification, Roger Dedeyne, Ivo Quintens, 2007 |
Friedelite |
1.625 |
1.664 |
0.03 |
0.03 |
3.04 |
3.07 |
1.625 |
1.629 |
1.654 |
1.664 |
Joel Arem, Color Encyclopedia of Gemstones, 1987 |
Friedelite |
1.625 |
1.664 |
0.029 |
0.035 |
3.06 |
3.19 |
|
|
|
|
Bestimmungstabellen für Edelsteine,
Birgit Günther, 1981 |
Friedelite |
1.625 |
1.664 |
0.029 |
0.035 |
3.04 |
3.19 |
1.625 |
1.630 |
1.654 |
1.664 |
Gemme, Dati per l'identificazione, P. De
Stefano et al, 1993 |
Friedelite |
1.625 |
1.664 |
0.03 |
0.03 |
3.04 |
3.07 |
|
|
|
|
http://www.gemmology.be |
Friedelite |
1.625 |
1.664 |
0.03 |
0.03 |
3.04 |
3.07 |
1.625 |
1.629 |
1.654 |
1.664 |
http://www.geminterest.com |
Friedelite |
1.627 |
1.663 |
0.032 |
0.035 |
3.04 |
3.19 |
1.627 |
1.630 |
1.659 |
1.663 |
Gemmological Tables, Ulrich Henn,
2004 |
Friedelite |
1.629 |
1.664 |
0.035 |
0.035 |
3.06 |
3.19 |
|
|
|
|
Gems, R Webster, 5th edition 1994 |
Friedelite |
1.63 |
1.66 |
0.03 |
0.03 |
3.05 |
3.09 |
|
|
|
|
Tabellen zur Edelstein-Bestimmung,
Pschichholz FGA, 1975 |
Friedelite |
1.64 |
1.65 |
|
|
3.07 |
3.07 |
|
|
|
|
John Sinkakas, Gemstone and mineral data book,1972 |
CAUSE OF
COLOUR
Stone |
Colour |
Cause of
colour |
Reference |
Friedelite |
red |
Mn? |
Gems & Gemology 1982 Winter p224 |
Friedelite |
red |
Mn²+ |
https://www.dgemg.com/images/NewsletterJanuar2018/Friedelit-Newsletter-Januar-2018.pdf |
MINERAL
INCLUSIONS
LOCALITIES
STONE |
LOCALITIES |
REFERENCE |
|||
Friedeliet |
Kalahari Manganese field |
Kuruman, Kalahari |
Cape Province |
Zuid-Afrika |
Gems & Gemology 1982 Winter p 224 |
CHEMICAL DATA
Stone |
Colour |
Locality |
Reference |
SiO2 |
Al2O3 |
MnO |
MgO |
FeO |
Na2O |
Cl |
|
Friedelite |
|
Kalahari Manganese Field, Kuruman |
South Africa |
Gems & Gemology 1982 Winter p 224 |
35.82 |
0.06 |
52.33 |
1.43 |
1.29 |
0.04 |
3.59 |