Very rare to see !
So-called "ERZMAUS" was the term used by miners to refer to inclusions of other minerals in SIDERIT/ANKERIT EISENERZ.
In this piece a typical inclusion of coarse, white CALCITE in massive SIDERITE - IRON SPAR - on the outside, however, there are also many SIDERITE xx crystals with end faces.
Hüttenberg ore mining - Carinthia
Weight: 780 g Dimensions: 10 x 8 x 7 cm The "ERZMAUS" is 6.5 cm long and 4 cm wide
Exceptional piece that certainly not many collectors have seen.