編號 100308282

編號 100308282

This a large and rare black franklinite crystals on a matrix of calcite and willemite from the fluorescent mineral capitol of the world, the Franklin mine.
Franklinite crystals like these are rare.
The octahedral crystal has a great luster and stand on top of matrix of fluorescent calcite and willemite.
The size of the crystal is 3x2.5x2.5 centimeter.
photo of fluorescent response is taken under shortwave uv.
NB, the crystal is professionally replaced on the matrix.