This Primordial Stone appears to trigger the damage/healing/buff effect from one of the following set of 14 each time it procs.
8 Damage Stones: 风暴灌注之石, 回响雷霆之石, 烈焰舔舐之石, 烁光黑曜之石, 冻结寒冰之石, 嗡鸣奥术之石, 疫病灾祸之石, 欲渴鲜血之石
3 Healing Stones: 洪涛流水之石, 洋溢蒸汽之石, 狂野灵魂之石
2 Absorb Stones: 不屈大地之石, 寒凝冰霜之石
1 Buff Stone: 谐韵音色之石

This Primordial Stone also has a much higher RPPM than other Primordial Stones to offset the fact that the procs are random.

This is one of the three stones contained within 浓缩的奥术魔法.

The total list of Primordial Stones is below in the spoiler:

Condensed Magic	Possible Stones
浓缩的奥术魔法	谐韵音色之石嗡鸣奥术之石晦思彩笔之石
浓缩的大地魔法	流光铁肤之石不屈大地之石烁光黑曜之石
浓缩的火焰魔法	熵增邪能之石烈焰舔舐之石暴怒岩浆之石灼热烟雾之石
浓缩的冰霜魔法	寒凝冰霜之石洪涛流水之石洋溢蒸汽之石冻结寒冰之石闪光法力之石
浓缩的自然魔法	回响雷霆之石疫病灾祸之石风暴灌注之石狂野灵魂之石微风雕塑之石
浓缩的死灵魔法	欲渴鲜血之石通灵死亡之石
浓缩的暗影魔法	先知暮光之石螺旋魔精之石

Any reason to upgrade this with Unstable Elementium?

How does it perform when only using heals? Are the procs silent then or do only heal effects trigger at the same rate?

For those who wonder, this can only be used with Onyx Annulet

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晦思彩笔之石

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