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西班牙的矿物学家在20年前于南部阿梅里亚省发现一个巨型晶体山洞，由于洞内晶柱非常晶莹通透，专家一直无法测定其于何时及如何形成。有地质学家近日分析洞内晶体结构后发表新研究报告，破解晶洞形成之谜。

该个位于普尔皮(Pulpi)一个废弃银矿场下50米的巨型晶洞，长8米、阔2米，里面的晶柱有些长达2米。

格拉纳达大学地质学家加西亚鲁伊斯表示，世界其它地方也有巨型晶洞，其水热系统仍然活跃，地质学家可以研究结晶形成过程，但普尔皮晶洞却大不相同，不但已进入化石环境状态，里面的晶柱亦非常透明，以致无法测定其形成时期。

加西亚鲁伊斯于是和团队人员采集洞内矿物及环境样本，将之与晶洞外矿场的地球化学结构对比分析。结果发现晶洞应在560万年前地中海干涸时开始形成，其后因为一种名为“奥斯瓦尔德热化”的现象令结晶速度加快，并于至少6万至200万年前形成如目前所见的晶柱。

为了让更多人欣赏普尔皮晶洞的美景，阿梅里亚省政府今年8月开放该晶洞予公众参观。