Discussions

╳Discussions

Groups

Recent Images in Discussions

Identity Helpa question for norwegian collectors

7th Oct 2019 08:24 UTCAchille Sorlini

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?

Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2024, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: April 20, 2024 00:42:39

Go to top of page