VALENTINITE + KERMESITE RADIAL CRYSTALSRARE* SLOVAKIA

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VALENTINITE and KERMESITE *silvery-white and cherry-red fibrous radial crystals on sulfide matrix* * rare ** super specimen from famous locale * size: 91mm X 45mm X 38mmweight: 256g origin: Mt Kolársky, Pezinok, Malé Karpaty Mts, Bratislava Region, Slovakia Mt Kolársky - An Sb mine famous for excellent kermesite specimens Valentinite is a high lustered, often fibrous oxide mineral. It forms sprays of crystals that are usually matted to the host rock in radiating clusters. Its adamantine (gem-like) to pearly luster serves to add a nice quality to this uncommon antimony mineral. Valentinite is dimorphous with the mineral senarmontite. Both minerals have the exact same chemistry, but they have different structures. Senarmontite is isometric and valentinite is orthorhombic. It is similar to the situation between diamond and graphite. Valentinite is associated with senarmontite as well as stibnite. Actually this association is no surprise since both senarmontite and valentinite are oxidation products of the antimony sulfide. Kermesite is an unusual sulfide mineral. A close look at the formula can confirm this. T is an oxygen nested between two antimonies and two sulfurs. Kermesite, it turns out, is an intermediate oxidation product between stibnite whose formula is Sb 2S 3, and various antimony oxides such as senarmontite, Sb 2O 3; read more

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