Rare-earth aluminum or gallium borates with the general formula RX 3 (BO 3 ) 4 (R=rareearth, X=Al or Ga) have a significant rareearth cation separation, desirable for avoiding deleterious interactions, and can provide a platform for studies relating imperfections to linewidth. Here, we focus on EuAl 3 (BO 3 ) 4 . Large single crystals have been precipitated from various flux systems since Ballman first synthesized the R32 space group polymorph in 1962. Flux growths inevitably introduce inclusions in crystals. In fact, for RX 3 (BO 3 ) 4 growths, Pb ions have been introduced by PbF 2 -B 2 O 3 flux, Bi ions by Bi 2 O 3 -B 2 O 3 flux, and Mo ions by K 2 Mo 3 O 10 flux at percent levels on cation sites.