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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
Triphylite	1.685	1.693	0.008	0.008	3.53	3.53	brown	Brazil	1.22ct										Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2008 Dec, p118
Triphylite	1.687	1.7	0.007	0.008	3.52	3.57	dark orangy red, slight colour change from greenish brown in daylight to brownish pink or purple	Galileia, Minas Gerais, Brazil	0.26-9.31ct	1.687	1.692	1.689	1.695	1.695	1.700	410, 450-460nm, strong lines near 470, bands at 490-500 and 600	inert	inert	Gems & Gemology 2009 Fall, p229-230
Triphylite	1.688	1.693	0.005	0.005	3.5	3.5	greenish-brown	Conselheiro Pena, Minas Gerais, Brazil		1.688	1.688	1.689	1.689	1.693	1.693				Zeitschrift der Deutschen Gemmologischen Gesellschaft 1993 Sep, p66
Triphylite	1.689	1.695	0.006	0.006	3.4	3.4	greyish brown		0.65ct	1.689	1.689	1.691	1.691	1.695	1.695	strong line at 410, weak at 425, moderate band at 450-460, line at 470, band at 485-498, weak band at 540-590nm	inert	inert	Gems & Gemology 1988 fall p 170
Triphylite	1.69	1.696	0.006	0.006	3.52	3.52	colour-change yellow green to greenish yellow (daylight) to yellowish orange or brownish orange (incandescent light)	Brazil	0.23 to 1.93ct, 67.5 % triphylite - 32.5% lithiophylite	1.690	1.690	1.691	1.691	1.696	1.696				The Australian Gemmologist 2011 Vol 24, N°5, p104-105

 

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
Triphylite	1.663	1.702	0.005	0.006	3.35	3.6	1.663	1.696			1.673	1.702	Bestimmungstabellen für Edelsteine, Birgit Günther, 2008
Triphylite	1.674	1.701	0.005	0.01	3.4	3.6							Gemmo.eu
Triphylite	1.689	1.702	0.006	0.008	3.34	3.58	1.689	1.694	1.689	1.695	1.695	1.702	Joel Arem, Color Encyclopedia of Gemstones, 1987
Triphylite	1.689	1.702	0.006	0.008	3.34	3.58							http://www.gemmology.be
Triphylite	1.689	1.702	0.006	0.008	3.34	3.58	1.689	1.694	1.689	1.695	1.695	1.702	http://www.geminterest.com
Triphylite	1.689	1.702	0.006	0.008	3.42	3.52	1.689	1.694			1.695	1.702	Gems, R Webster, 5th edition 1994
Triphylite	1.689	1.702	0.006	0.008	3.34	3.58	1.689	1.694	1.689	1.695	1.695	1.702	Tables of Gemstone Identification, Roger Dedeyne, Ivo Quintens, 2007
Triphylite	1.689	1.702	0.006	0.008	3.34	3.58							Gemology Tools Professional 2010

 

CAUSE OF COLOUR

 

MINERAL INCLUSIONS

 

LOCALITIES

STONE	LOCALITIES				REFERENCE
Triphylite		Galiléia, Governador Valadares, Rio doce	Minas Gerais	Brazil	Gems & Gemology 2009 Fall, p229-230

 

CHEMICAL DATA (%)