|
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 |
|
Enstatite |
1,65 |
1,658 |
0,008 |
0,008 |
3,194 |
3,194 |
colourless |
Embilipitiya, Sri Lanka |
|
|
|
|
|
|
|
band 506nm |
|
|
Gems & Gemology 1996
winter, p262-269 |
|
Enstatite |
1,65 |
1,684 |
0,008 |
0,009 |
3,201 |
3,286 |
colourless, brown |
Embilipitiya, Sri Lanka |
|
1,650 |
1,660 |
|
|
1,674 |
1,684 |
strong line at 506nm,
distinct 544nm line |
|
|
The Australian
Gemmologist 1986 Vol 16, Nr 2, p35-40 |
|
Enstatite |
1,65 |
1,661 |
0,011 |
0,011 |
3,2 |
3,2 |
yellow-brown |
Tanzania |
|
1,650 |
1,650 |
1,654 |
1,654 |
1,661 |
1,661 |
line at 506nm |
inert |
inert |
http://www.geminterest.com
2008 |
|
Enstatite |
1,65 |
1,66 |
0,01 |
0,01 |
3,22 |
3,22 |
colourless |
Sri Lanka |
12.05ct |
|
|
|
|
|
|
line at 509nm |
weak yellow |
inert |
GIA Gem Database 34827 |
|
Enstatite |
1,651 |
1,66 |
0,009 |
0,009 |
3,22 |
3,22 |
colourless |
Sri Lanka |
16.31ct |
|
|
|
|
|
|
no features |
moderate yellowish green |
weak yellow |
GIA Gem Database 34820 |
|
Enstatite |
1,652 |
1,662 |
0,01 |
0,01 |
3,23 |
3,23 |
yellowish green |
Mairimba Hill, Kenya |
|
|
|
|
|
|
|
|
|
|
The Journal of Gemmology
1982 Vol18, N°2, p118-120 |
|
Enstatite |
1,652 |
1,662 |
0,01 |
0,01 |
3,27 |
3,27 |
dark reddish orange |
Tanga region, Tanzania |
13.38ct, biaxial + |
|
|
|
|
|
|
lines at 435, 450, 475,
485, 510, 550nm |
inert |
inert |
GIA Gem Database 35004 |
|
Enstatite |
1,653 |
1,663 |
0,01 |
0,01 |
3,25 |
3,25 |
brown |
Tanzania |
|
|
|
|
|
|
|
|
|
|
The Journal of Gemmology
1982 Vol18, N°2, p118-120 |
|
Enstatite |
1,653 |
1,662 |
0,009 |
0,009 |
3,24 |
3,24 |
dark brownish yellow |
Madagascar |
9.15ct, biaxial - |
|
|
|
|
|
|
broad absorption below
460nm, lines at 487, 510, 550nm |
inert |
inert |
GIA Gem Database 34413 |
|
Enstatite |
1,653 |
1,663 |
0,01 |
0,01 |
3,24 |
3,24 |
light brownish orange |
Sri Lanka |
|
|
|
|
|
|
|
line at 509nm |
inert |
inert |
GIA Gem Database 34819 |
|
Enstatite |
1,654 |
1,664 |
0,01 |
0,01 |
3,28 |
3,28 |
yellowish brown |
Tanzania |
|
|
|
|
|
|
|
|
|
|
The Journal of Gemmology
1982 Vol18, N°2, p118-120 |
|
Enstatite |
1,655 |
1,668 |
0,013 |
0,013 |
3,21 |
3,21 |
green |
|
0.1ct |
|
|
|
|
|
|
weak 506nm |
|
|
ACAM labo |
|
Enstatite |
1,655 |
1,669 |
0,009 |
0,014 |
3,22 |
3,25 |
light yellowish green |
|
0.65ct to 1.44ct,
cabochon 2.78ct with 4 rayed star, weak orange under chelsea filter |
1,655 |
1,660 |
1,661 |
1,665 |
1,668 |
1,669 |
|
inert |
inert |
Gems & Gemology 2022
Spring, p120-121 |
|
Enstatite |
1,657 |
1,666 |
0,009 |
0,009 |
3,24 |
3,24 |
colourless |
Sri Lanka |
1.49ct |
|
|
|
|
|
|
|
|
|
Gemmologie, Zeitschrift
der Deutschen Gemmologischen Gesellschaft 1999 Jul p106 |
|
Enstatite |
1,658 |
1,669 |
0,01 |
0,01 |
3,25 |
3,25 |
|
Embilipitiya, Sri Lanka |
largest 19.5ct |
1,657 |
1,659 |
|
|
1,667 |
1,669 |
|
|
|
The Journal of Gemmology
1985 Vol 19, No 5, p419-425 |
|
Enstatite |
1,658 |
1,668 |
0,01 |
0,01 |
3,25 |
3,25 |
near-colourless |
Sri Lanka |
|
1,658 |
1,658 |
1,661 |
1,661 |
1,668 |
1,668 |
506nm line, very faint
lines at 510 and 502nm, weak band around 543nm |
|
|
The Journal of Gemmology
1982 Vol18, N°3, p213-216 |
|
Enstatite |
1,66 |
1,671 |
0,011 |
0,011 |
3,28 |
3,28 |
brown |
|
|
|
|
|
|
|
|
506nm |
|
|
ACAM labo |
|
Enstatite |
1,66 |
1,669 |
0,009 |
0,009 |
3,29 |
3,29 |
yellowish green |
Mogok, Myanmar |
1.50ct |
|
|
|
|
|
|
line at 510nm |
inert |
inert |
GIA Gem Database 34561 |
|
Bronzite - enstatite |
1,66 |
1,675 |
0,015 |
0,015 |
3,31 |
3,31 |
brown |
|
1.14 ct |
1,660 |
1,660 |
1,668 |
1,668 |
1,675 |
1,675 |
510 nm |
inert |
inert |
ACAM lab 1766 |
|
Bronzite - enstatite |
1,66 |
1,67 |
0,01 |
0,01 |
3,25 |
3,25 |
light brown |
Madagascar |
1.24 cabochon, six-rayed,
translucent, biaxial+, slightly attracted to N52 magnet |
|
|
|
|
|
|
|
inert |
inert |
The Journal of Gemmology
2019 36(8), p688-690 |
|
Enstatite |
1,66 |
1,67 |
0,01 |
0,01 |
|
|
yellowish green |
Tanzania |
|
|
|
|
|
|
|
|
|
|
The Journal of Gemmology
2019 36(8), p691-693 |
|
Enstatite |
1,661 |
1,667 |
0,006 |
0,006 |
3,28 |
3,28 |
yellow-brown |
|
0.9ct |
|
|
|
|
|
|
506nm line, 540nm |
|
|
ACAM labo |
|
Enstatite |
1,661 |
1,671 |
0,01 |
0,01 |
3,33 |
3,33 |
brown, transparent |
Tanzania |
2.05ct |
|
|
|
|
|
|
strong band 506nm |
|
|
Gemmologie, Zeitschrift
der Deutschen Gemmologischen Gesellschaft 2008 Dec, p123 |
|
Enstatite |
1,661 |
1,672 |
0,008 |
0,011 |
3,26 |
3,29 |
green |
Emali, Kenya |
4 stones, 1.18ct-1.49ct |
|
|
|
|
|
|
line at 505nm and 550nm |
inert |
inert |
The Journal of Gemmology
2017 Vol 35-7, p575 |
|
Enstatite |
1,662 |
1,673 |
0,011 |
0,011 |
3,33 |
3,41 |
orangish-brown |
East Africa |
46.45ct |
1,662 |
1,662 |
1,667 |
1,667 |
1,673 |
1,673 |
sharp line 506nm |
inert |
inert |
The Journal of Gemmology
1988 Vol 21, N°2, p92-94 |
|
Enstatite |
1,663 |
1,671 |
0,008 |
0,008 |
3,26 |
3,26 |
dark yellowish green |
Maktau, Kenya |
|
|
|
|
|
|
|
small band at 506nm |
inert |
inert |
Gems & Gemology 2012
Spring, p65-66 |
|
Enstatite |
1,663 |
1,677 |
0,014 |
0,014 |
3,25 |
3,25 |
yellowish brown |
Sri Lanka |
|
|
|
|
|
|
|
|
|
|
Gemmologie, Zeitschrift
der Deutschen Gemmologischen Gesellschaft 1976 25, 3, p153-155 |
|
Enstatite |
1,663 |
1,672 |
0,009 |
0,009 |
3,32 |
3,32 |
brownish reddish orange |
Sri Lanka |
6.32ct |
|
|
|
|
|
|
line at 509nm, band at
545-553nm |
inert |
inert |
GIA Gem Database 34826 |
|
Enstatite |
1,665 |
1,675 |
0,01 |
0,01 |
3,31 |
3,31 |
dark yellow-green |
Balluchistan, Pakistan |
|
|
|
|
|
|
|
506nm line, band 548 |
inert |
inert |
Gems & Gemology 2009
Fall, p219 |
|
Enstatite |
1,665 |
1,675 |
0,01 |
0,01 |
3,25 |
3,25 |
green |
Tanzania |
|
|
|
|
|
|
|
|
|
|
The Journal of Gemmology
1982 Vol18, N°2, p118-120 |
|
Enstatite |
1,668 |
1,68 |
0,012 |
0,012 |
3,39 |
3,39 |
greenish brown |
Sri Lanka |
|
|
|
|
|
|
|
absorption at 505nm |
|
|
Gemmologie, Zeitschrift
der Deutschen Gemmologischen Gesellschaft 1998 Sep, p169 |
|
Bronzite - enstatite |
1,668 |
1,68 |
0,012 |
0,012 |
3,36 |
3,36 |
yellowish orange |
Umba, Tanzania |
4.87ct |
|
|
|
|
|
|
lines at 450, 485, 506,
508, 550nm |
inert |
inert |
GIA Gem Database 35015 |
|
Enstatite |
1,669 |
1,679 |
0,01 |
0,01 |
|
|
yellowish green |
East Africa |
|
1,669 |
1,669 |
1,672 |
1,672 |
1,679 |
1,679 |
|
|
|
Gems & Gemology 1983
Summer, p106 |
|
Enstatite |
1,669 |
1,68 |
0,011 |
0,011 |
3,27 |
3,27 |
yellowish brown |
|
anisotrope 2+, six-star |
1,669 |
1,669 |
1,674 |
1,674 |
1,680 |
1,680 |
|
|
|
http://www.dgemg.com/
2022 2 |
|
Bronzite - enstatite |
1,68 |
1,693 |
0,013 |
0,013 |
3,41 |
3,41 |
|
Sri Lanka |
78.39% enstatite,
asterism (caused by hollow tubes) |
1,680 |
1,680 |
1,689 |
1,689 |
1,693 |
1,693 |
|
|
|
Zeitschrift der Deutschen
Gemmologischen Gesellschaft 1991 Sep, p 145-148 |
|
Enstatite |
1,68 |
1,694 |
0,014 |
0,014 |
3,43 |
3,43 |
very dark reddish orange |
Sri Lanka |
2.90ct |
|
|
|
|
|
|
lines at 477, 488, 512nm,
band at 550-560nm |
inert |
inert |
GIA Gem Database 34846 |
|
Enstatite |
1,685 |
1,697 |
0,012 |
0,012 |
3,35 |
3,35 |
brown |
Norway |
20.89 ct, star-effect
caused by ilmenite needles |
1,685 |
1,685 |
1,693 |
1,693 |
1,697 |
1,697 |
|
|
|
Gemmologie, Zeitschrift
der Deutschen Gemmologischen Gesellschaft 2016 Jun, p23-30 |
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 |
|
Enstatite |
1.648 |
1.681 |
0.008 |
0.012 |
3.09 |
3.5 |
|
|
|
|
|
|
Gemmo.eu
|
|
Enstatite |
1.649 |
1.68 |
0.01 |
0.01 |
3.2 |
3.3 |
1.649 |
1.667 |
1.653 |
1.671 |
1.657 |
1.680 |
Michael
O'Donoghue, Gems: Their Sources, Descriptions and Identification (2006), 873pp
|
|
Enstatite - colourless |
1.65 |
1.659 |
0.009 |
0.009 |
3.22 |
3.22 |
|
|
|
|
|
|
Gems, R Webster,
5th edition 1994 |
|
Enstatite |
1.65 |
1.678 |
0.009 |
0.016 |
3.1 |
3.3 |
1.650 |
1.666 |
|
|
1.660 |
1.678 |
Gemme, Dati per l'identificazione, P. De
Stefano et al, 1993 |
|
Enstatite |
1.65 |
1.68 |
0.01 |
0.01 |
3.2 |
3.3 |
|
|
|
|
|
|
http://www.gemmology.be |
|
Enstatite |
1.65 |
1.68 |
0.009 |
0.011 |
3.2 |
3.3 |
1.650 |
1.665 |
1.653 |
1.671 |
1.658 |
1.680 |
http://www.geminterest.com |
|
Enstatite |
1.65 |
1.68 |
0.01 |
0.01 |
3.2 |
3.3 |
1.650 |
1.665 |
1.653 |
1.671 |
1.658 |
1.680 |
Joel Arem, Color
Encyclopedia of Gemstones, 1987 |
|
Enstatite |
1.65 |
1.673 |
0.009 |
0.01 |
3.22 |
3.28 |
|
|
|
|
|
|
Gems, R Webster,
5th edition 1994 |
|
Enstatite |
1.65 |
1.68 |
0.01 |
0.015 |
3.2 |
3.3 |
1.650 |
1.665 |
1.653 |
1.671 |
1.658 |
1.680 |
Tables of
Gemstone Identification, Roger Dedeyne, Ivo Quintens, 2007 |
|
Enstatite |
1.652 |
1.69 |
0.01 |
0.012 |
3.23 |
3.28 |
1.652 |
1.678 |
1.654 |
1.680 |
1.662 |
1.690 |
Gemmological Tables, Ulrich Henn,
2004 |
|
Enstatite |
1.653 |
1.673 |
0.009 |
0.01 |
3.23 |
3.28 |
1.653 |
1.663 |
|
|
1.663 |
1.673 |
Tabellen zur Edelstein-Bestimmung,
Pschichholz FGA, 1975 |
|
Enstatite |
1.653 |
1.683 |
0.008 |
0.011 |
3.23 |
3.4 |
|
|
|
|
|
|
Gemology Tools Professional 2010 |
|
Enstatite |
1.657 |
1.69 |
0.009 |
0.012 |
3.19 |
3.28 |
1.650 |
1.678 |
|
|
1.658 |
1.690 |
Bestimmungstabellen für Edelsteine,
Birgit Günther, 2008 |
|
Bronzite - enstatite |
1.66 |
1.703 |
0.009 |
0.014 |
3 |
3.5 |
1.660 |
1.686 |
|
|
1.667 |
1.703 |
Gemme, Dati per l'identificazione, P. De
Stefano et al, 1993 |
|
Bronzite - enstatite |
1.663 |
1.693 |
0.01 |
0.014 |
3.25 |
3.41 |
1.663 |
1.680 |
|
|
1.677 |
1.693 |
Bestimmungstabellen für Edelsteine,
Birgit Günther, 1981 |
|
Bronzite - enstatite |
1.663 |
1.688 |
0.009 |
0.014 |
3.25 |
3.35 |
1.663 |
1.673 |
1.669 |
1.681 |
1.677 |
1.688 |
Gemmological Tables, Ulrich Henn,
2004 |
|
Bronzite - enstatite |
1.663 |
1.693 |
0.013 |
0.014 |
3.25 |
3.41 |
1.663 |
1.680 |
1.669 |
1.689 |
1.677 |
1.693 |
Gems, R Webster,
5th edition 1994 |
|
Enstatite |
1.663 |
1.673 |
0.1 |
0.1 |
3.26 |
3.3 |
|
|
|
|
|
|
John Sinkakas,
Gemstone and mineral data book,1972 |
|
Bronzite - enstatite |
1.665 |
1.703 |
0.015 |
0.015 |
3.3 |
3.43 |
1.665 |
1.686 |
|
|
1.680 |
1.703 |
http://www.geminterest.com |
|
Bronzite - enstatite |
1.665 |
1.703 |
0.015 |
0.015 |
3.3 |
3.43 |
1.665 |
1.686 |
|
|
1.680 |
1.703 |
Joel Arem, Color
Encyclopedia of Gemstones, 1987 |
|
Bronzite - enstatite |
1.665 |
1.703 |
0.015 |
0.017 |
3.3 |
3.43 |
1.665 |
1.686 |
|
|
1.680 |
1.703 |
Tables of
Gemstone Identification, Roger Dedeyne, Ivo Quintens, 2007 |
|
Bronzite - enstatite |
1.665 |
1.703 |
0.01 |
0.018 |
3.2 |
3.96 |
|
|
|
|
|
|
Gemology Tools Professional 2010 |
|
Bronzite - enstatite |
|
|
0.014 |
0.014 |
3.3 |
3.4 |
|
|
|
|
|
|
John Sinkakas,
Gemstone and mineral data book,1972 |
CAUSE OF
COLOUR
|
Stone |
Colour |
Cause
of colour |
Reference |
|
Enstatite |
greenish brown |
Fe²+ |
Gems & Gemology Summer 1988 |
|
Enstatite |
green |
Fe²+ with minor Cr³+ |
Gems & Gemology Summer 1988 |
MINERAL INCLUSIONS
|
Inclusion |
Stone |
Reference |
|
apatite |
Enstatite |
Gems & Gemology, 1996,winter, p262-269 |
|
goethite |
Hypersthene - enstatite group |
Joel Arem, Color
Encyclopedia of Gemstones, 1987 |
|
hematite |
Enstatite |
Gems & Gemology, 1996,winter, p262-269 |
|
hematite |
Hypersthene - enstatite group |
Joel Arem, Color
Encyclopedia of Gemstones, 1987 |
|
muscovite |
Enstatite |
Gems & Gemology, 1996,winter, p262-269 |
|
phlogopite |
Enstatite |
Gems & Gemology, 1996,winter, p262-269 |
|
quartz |
Enstatite |
Gems & Gemology, 1996,winter, p262-269 |
|
rutile |
Enstatite |
Gems & Gemology, 1996,winter, p262-269 |
|
sillimanite |
Enstatite |
Gems & Gemology, 1996,winter, p262-269 |
|
xenotime |
Enstatite |
Gems & Gemology, 1996,winter, p262-269 |
|
zircon |
Enstatite |
Gems & Gemology, 1996,winter, p262-269 |
LOCALITIES
|
STONE |
LOCALITIES |
REFERENCE |
|||
|
Enstatite |
|
Mairimba Hill |
|
Kenya |
The Journal of
Gemmology 1982, Vol 18, N°2, p118-120 |
|
Enstatite |
Merelani Hills
(Mererani), Umba Valley |
Lelatema Mts |
Arusha Region |
Tanzania |
Gemmologie, 1997, Mar, p31 |
CHEMICAL DATA
|
Stone |
Colour |
Locality |
Reference |
SiO2 |
Al2O3 |
MnO |
MgO |
FeO |
TiO2 |
CaO |
Na2O |
Cr2O3 |
|
|
Bronzite - enstatite group |
brown |
|
Brazil |
Gems & Gemology 1975, Winter, p120 |
56.72 |
0.58 |
0.21 |
32.57 |
10.28 |
0.02 |
0.24 |
0.02 |
|
|
Enstatite |
|
|
East Africa |
Gems & Gemology 1983 Summer p107 |
53.93 |
7.1 |
1.12 |
32.71 |
4.49 |
0.09 |
0.14 |
|
0.09 |
|
Enstatite |
orangish-brown |
|
East Africa |
The Journal of
Gemmology 1988, Vol21, N°2, p94 |
56.99 |
0.74 |
0.18 |
33.78 |
7.45 |
0.04 |
0.36 |
|
0.08 |
|
Bronzite - enstatite group |
greenish-brown |
|
India |
Gems & Gemology 1975, Winter, p120 |
55.93 |
0.63 |
0.24 |
31.19 |
9.78 |
0.03 |
0.26 |
0.03 |
|
|
Bronzite - enstatite group |
brown |
|
India |
Gems & Gemology 1975, Winter, p120 |
57.69 |
0.57 |
0.24 |
32.42 |
10.55 |
0.04 |
0.25 |
0.03 |
|
|
Enstatite |
yellowish green |
Mairimba Hill |
Kenya |
The Journal of
Gemmology 1982, Vol 18, N°2, p120 |
55.57 |
3.6 |
|
38.27 |
1.45 |
|
|
|
0.22 |
|
Enstatite |
brown |
|
Norway |
Gemmologie, Zeitschrift der Deutschen
Gemmologischen Gesellschaft, Jun 2016, p24 |
49.73 |
5.7 |
0.19 |
25.86 |
15.72 |
|
0.27 |
|
|
|
Bronzite - enstatite group |
|
|
Sri Lanka |
Zeitschrift der Deutschen Gemmologischen
Gesellschaft, 1991, Sep, p147 |
52.42 |
3.1 |
0.34 |
29.06 |
14.21 |
|
0.33 |
|
|
|
Enstatite |
brownish-green |
|
Sri Lanka |
Gems & Gemology 1975, Winter, p120 |
58.14 |
0.81 |
0.15 |
35.35 |
5.2 |
0.02 |
0.52 |
0.03 |
|
|
Enstatite |
colourless |
Embilipitiya |
Sri Lanka |
The Journal of
Gemmology 1985, Vol 19 No 5 p425 |
58.9 |
1.7 |
|
38 |
1 |
0.03 |
0.1 |
0.02 |
|
|
Enstatite |
colourless |
Embilipitiya |
Sri Lanka |
The Australian
Gemmologist Feb 1986, Vol 16, Nr1, p3 |
59.24 |
1.48 |
0.01 |
37.05 |
1.61 |
0.04 |
0.04 |
|
|
|
Enstatite |
colourless |
Embilipitiya |
Sri Lanka |
The Australian
Gemmologist Feb 1986, Vol 16, Nr1, p3 |
59.26 |
1.47 |
0.01 |
36.87 |
1.61 |
0.06 |
0.04 |
|
|
|
Enstatite |
reddish brown |
Embilipitiya |
Sri Lanka |
The Australian
Gemmologist Feb 1986, Vol 16, Nr1, p3 |
54.28 |
2.38 |
0.11 |
27.27 |
14.48 |
0.04 |
0.11 |
|
|
|
Enstatite |
colourless |
Embilipitiya |
Sri Lanka |
The Australian
Gemmologist Feb 1986, Vol 16, Nr1, p3 |
60 |
0.43 |
0.01 |
37.76 |
1.06 |
0.06 |
0.06 |
|
|
|
Enstatite |
greenish |
Ratnapura |
Sri Lanka |
The Journal of
Gemmology 1985, Vol 19 No 5 p425 |
55 |
6.6 |
0.1 |
32.8 |
5.5 |
0.15 |
0.1 |
0.04 |
0.02 |
|
Enstatite |
brown |
|
Tanzania |
Gems & Gemology 1975, Winter, p120 |
59.17 |
1.33 |
0.08 |
38 |
1.95 |
0.03 |
0.07 |
0.05 |
|
|
Enstatite |
dark green |
Arizona |
USA |
Gems & Gemology 1975, Winter, p120 |
56.44 |
3.22 |
0.15 |
33.46 |
5.72 |
0.1 |
1.46 |
0.08 |
|
|
Bronzite - enstatite group |
dark green |
Arizona |
USA |
Gems & Gemology 1975, Winter, p120 |
56.23 |
3.51 |
0.14 |
33.17 |
6.8 |
0.2 |
0.99 |
0.15 |
|