Siderite with Quartz, Calcite

specimen number:
2312221

location:
Turt Mine, Satu Mare Co., Romania

description:

The top of this crystallized quartz matrix is covered with rhombohedral crystals of siderite. Colorless crystal groupings of calcite are scattered throughout. Attractive and in great condition.

The Turt Mine, located in the Oas Mountains of Satu Mare County in northwestern Romania, is part of a historic metallogenic region with long-standing underground mining operations targeting base and precious metals. Geologically, the deposit is situated within the Neogene volcanic belt of the Inner Carpathians, where subvolcanic structures and complex hydrothermal vein systems cut through older formations. These fluid systems deposited concentrated pockets of lead, zinc, and copper sulfides. The mine has gained recognition among mineral collectors for producing fine specimens of galena, quartz, and distinctive pseudomorphs or crystal casts involving siderite replacing earlier carbonate minerals.

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