Gemological and Spectral Characteristics of Gem-Quality Blue Gahnite from Nigeria

Table 1

The gemological characteristics of gahnite.

Samples	RI	Weight		Specific gravity	UV fluorescence
		Weight (air)	Weight (water)		Long-wave	Short-wave
S01	1.793	0.494	0.387	4.617	Inert	Inert
S02	1.793	0.423	0.330	4.548	Inert	Inert
S03	1.793	0.440	0.343	4.536	Inert	Inert
S04	1.792	0.433	0.337	4.510	Inert	Inert
S05	1.793	0.282	0.219	4.476	Inert	Inert
S06	1.794	0.256	0.198	4.414	Inert	Inert
S07	1.792	0.300	0.235	4.615	Inert	Inert
S08	1.794	0.316	0.247	4.580	Inert	Inert
S09	1.793	0.202	0.157	4.489	Inert	Inert
S10	1.794	0.305	0.238	4.552	Inert	Inert
S11	1.794	0.094	0.073	4.476	Inert	Inert
S12	1.793	0.134	0.105	4.621	Inert	Inert
S13	1.792	0.205	0.159	4.457	Inert	Inert
S14	1.792	0.070	0.055	4.667	Inert	Inert
S15	1.793	0.207	0.161	4.500	Inert	Inert
Average	1.793	0.277	0.216	4.537	Inert	Inert