Characterization of Natural Precious Opal Using Modern Spectroscopic Techniques in Ethiopia: The Case from Delanta, South Wollo

Table 1

Natural opal samples collected from different mining sites of Delanta district and description of their physical properties.

S/N	Sample location	Sample code	Specific gravity	Hardness	Color	Appearance
1	Workwasha	Ds-1	1.92	5.5	Play of color	Yellow tint dominant blue reddish
2	Alehuat	Ds-2	1.90	5.5	Play of color	Brownish dominant reddish green
3	Nechgedel	Ds-3	1.95	5.5	Play of color	Blue reddish
4	Abobetach	Ds-4	1.90	6.5	Play of color	Brownish dominant green
5	Chegen	Ds-5	1.94	5.5	Play of color	Yellowish green
6	Gelbate	Ds-6	1.9	6.5	Play of color	Yellow tint dominant blue reddish