This mystical crystal is not yet in balance. Perhaps if you place it in the bosom of its Earth Mother, and then join it with 4 other crystals, it can achieve harmony.
Black Crystal price in Growtopia: sells for about 3 DL 10 WL, buyers pay about 30 DL (median of 64 offers from community Discords, past 30 days). Live price chart and the latest buy and sell offers.
Recently sold at: DVFVV, GEIGER6S, LDHZP, AUHOO, WNSTN