几个世纪以来，石板瓦一直被用来覆盖屋顶，同时彰显出其艺术之美和技术性能。 “地质板岩”项目是荷兰斯哈斯贝赫城堡修复工作的一部分。 这座城堡的屋顶将用传统石板的可行替代品覆盖：首先，欧洲几乎所有的板岩采石场在过去一个世纪都被关闭，因而无法在当地进行采购；第二，板岩的生产效率非常低下，不可持续，从采石场提取的材料只有3%被做成板岩在市场上出售。 地质板岩的材料来自板岩开采时的残渣和荷兰土壤中的其他矿物原材料。 这种粉末状材料只能与作为粘合剂的地质有机聚合物混合在一起铸模成型，干燥 24 小时后即可以使用。 还可以用一个使用粉末的 3D 打印机来获得具有独特形状的瓷砖，就像城堡修复项目里一样。 打印好的瓷砖只需放在水中，然后在空气中晾干即可。 加工后的地质板岩具有与天然板岩类似的特性。

Tiles made of slate have been used for centuries to cover roofs for their aesthetic and technical properties. The “Geo Slate” project was developed as part of the restoration work of the Dutch Schaesberg Castle. The roof of this castle was to be covered with a viable alternative to traditional slate: firstly, because almost all slate quarries in Europe have been closed in the past century, which made local sourcing impossible; and secondly, because the production process of slate is highly inefficient and not sustainable, with only three per cent of the material extracted from quarries being sold on the market as slate. The material for Geo Slate comes from the residual flows of slate extraction and other mineral raw materials from Dutch soil. This powder-like material can only be mixed and moulded with geopolymers as binders and is usable after a drying time of 24 hours. Alternatively, a powder-based 3D printer can be used to obtain individually shaped tiles, as in the case of the castle restoration project. After the printing process, the tiles only need to be placed in water and then dried in the air. After processing, Geo Slate possesses properties that are comparable to natural slate.