Where am I? > Home > Library > Publication — identifier 0034
Publication — identifier 0034 [Johnson, M. L., McClure, S. F., DeGhionno, D. G. 1996]
Johnson, M. L., McClure, S. F., DeGhionno, D. G.
1996
Some Gemological Challenges in Identifying Black Opaque Gem Materials
Gems & Gemology 32 (4): 252—261
Among the most difficult gems to identify are those that are black and opaque. To identify a black opaque material, every possible mineral, and many rocks and manufactured substances, must be considered.