1) Borate mineral 2) Manganese mineral
Found on
https://www.crosswordclues.com/clue/seamanite
Seamanite, named for discoverer Arthur E. Seaman, is a rare manganese boron phosphate mineral with formula Mn3[B(OH)4](PO4)(OH)2. The yellow to pink mineral occurs as small, needle-shaped crystals. It was first discovered in 1917 from a mine in Iron County, Michigan, United States and identified in 1930. {As of|2012}, seamanite is known from four ...
Found on
http://en.wikipedia.org/wiki/Seamanite
No exact match found.
