This specimen is from a famous discovery near Zederhaus. The history of this cleft is published in an article in Lapis magazine (May-issue 2011), the "big brother" of the specimen was even at the cover of the magazine. First important indicator: usually we have  lot of clefts in Alps of Salzburg county, specially in Pinzgau and Pongau area. But in entire Lungau area clefts are very rare and hard to discover. Even local collectors with decades of experience sometimes needed years to discover only one good cleft. Second important indicator: this material is unique, only from this one cleft. The sides are all milky (with lot of structure, which is better visible in person), but all tips of the crystal are not milky, they are very glossy and you can look inside the crystals via the faces of tips. There is a little bit of greenish layer at the base (caused by green shists, the cleft was in green shist), which helps to give more contrast to the specimen. It is developed as floater and also reverse looks fine. Should be high ranked for it´s rarity. No significant damages to report.