The retreating Brunifirn glacier in the Alps of central Switzerland exposed a rock crystal extraction site exploited during the Early and Late Mesolithic. It has yielded organic objects preserved in the ice as well as rock crystal and quartz extraction waste, knapping debris, and tools.

中文翻译：

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瑞士阿尔卑斯山冰川保存的中石器时代水晶提取点

瑞士中部阿尔卑斯山正在退缩的布鲁尼菲尔冰川暴露了一个在中石器时代早期和晚期开采的水晶提取点。它产生了保存在冰中的有机物，以及水晶和石英提取废物、敲击碎片和工具。