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Identity Helpa question for norwegian collectors

7th Oct 2019 08:24 UTCAchille Sorlini

02852910015704330759612.jpg
Hello everybody,
a friend of mine has been working in the railway project of Follo Line, between Oslo and Ski.
It's a 25kms double tunnel.
He worked for an italian company, specialised in tunneling.

Coming back home, he gave me a specimen he took during his work. He isn't found of minerals and he has no knowledge about them: just sparkling things.
Added to this message you find some pictures.
The upper face is covered with small quartz xx, but overr them, you see some xx of 15-20mm , transparent with a complex habit.  On a side there are some pyrite xx.
The first guess is calcite, but it's not: no bubbling with HCl.
The second guess is Harmotome., but without analys I can't be sure.
On the back side you see bigger quartz points covered by small xx of the unknown.
The rock matrix isn't visible, all is covered by xx.

So the question is: what it is?  
Thanks for helping

Achille Sorlini




8th Oct 2019 11:20 UTCKnut Edvard Larsen Manager

Judging from the photo I would intuitively say calcite. Did you do the HCl test on a fresh, broken surface - like f.ex. on the broken surface on the upper left crystal in the photo?
 
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