17hlsrr ((ALUM Lab Grown)), $10 MINIMUM BID, Lab Grown in Poland, 4.5 x 4.5 x 3.5 cm, Miniature | |
Alum is hydrated potasium chromium sulfate. Deep reddish purple color is natural. Alum is used in the tanning process of leather. Gemmy crystal is 3 cm. Sits perfectly for display. |