• Hello From Descent

    The publication date for issue 289 is the 10th of December, meaning subscribers should receive their copies during the week leading up to that date. It is also available from caving suppliers such as Inglesport and Starless River, or from our new website

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Name that scunge...


Active member
Blue/white crystalline growth that I believe formed by seepage not an actual ore -- not certain!. Iron mine, Cretaceous sandstone above a harder grey limestone with a thin band of silicous poor iron stone/clay between. Blue/white scunge is roughly in area of the clay, so any damp would be from clay or sandstone above. Last worked 1857

Blue looks copper to me, but the only thing that matches pictures is copper hydroxide like Spertiniite, but this isn't a rare ore from Kazakhstan it's "scunge" in an English mine.

Any good suggestions anyone? Am I missing the obvious somewhere?


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Active member
Scale of pic is about 1foot by 1foot to box in the scunge. Didn't notice any other sign of copper or sulphur anywhere else while down there


Well-known member
Iron phosphate can be pale blue in some hydration states, AFAIK - the most common mineral form (Vivianite) is green but might be worth having a look on Mindat for iron phosphate minerals?


Active member
Thanks!!! Seems most plausible  :bow:

There's zero evidence of copper or sulphur but there is iron, albeit in obvious uneconomic quantities (some people must have lost a tidy sum of money on that mine). Minedat description seems to match very well. Without testing, after reading that... I'm pretty confident it's that

Thanks again  (y)