I think what you have is " high speed babbitt" it was the crystal looking aspect that jogged my memory.
There are many Babbitt alloys in addition to Babbitt's original. Some common compositions are:
90% tin, 10% copper
89% tin, 7% antimony, 4% copper
80% lead, 15% antimony, 5% tin
76% copper, 24% lead
75% lead, 10% tin
67% copper, 28% tin, 5% lead
I copied that from wikipedia
Bookmarks