Ungru limestone is mined in limestone quarries in Ridala rural municipality, Estonia. The stone is named Ungru after Ungru castle that is located beside the road leading to Rohuküla port and which is one of the grandest and well-known buildings made of that specific stone. This is a slightly dolomitic limestone that was formed approximately 350 million years ago in heavy wave area of the low tropical sea. That is why Ungru limestone has a characteristic structure, the beautiful colours and pattern of which are revealed when the stones are processed.

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