Gypsum of Swan Hill (Australia)

In Australia in the state of Victoria, there are several saline lakes. One of them, nearby the town of Swan Hill, is covered with water for 3 months a year, and groundwater resurge into springs in this lake. Sulfate-rich underground. This water precipitates minerals dissolved in this saline water, forming, according to the proportions of halite, alunite, gypsum... contained in the water the perfect conditions for a crystallization. So, with the arrival of the spring heat, the banks of the lake will be covered with gypsum crystals. More or less colored according to the traces of iron, aluminum... contained in the water. This lightweight and fragile object is therefore a part of the crystalized banks of the lake.