REBULITE with Realgar

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Rebulite is an exceptionally rare thallium antimony arsenic sulphide mineral - one of the few thallium-bearing species known to science. It has only been recorded from three localities worldwide and this specimen is from the first, or Type Locality, at Allchar in the Republic of Macedonia. The world's largest crystals come from a Chinese occurrence but they are still only on the scale of millimetres. Any crystals from Allchar are considered important and this thumbnail specimen features Realgar matrix with a 1.5 x 1 mm cavity containing microscopic black Rebulite crystals. It is from the superb systematic collection assembled by the brothers Martin and Michael Günther (1951-2007 & 1956-2021).