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PhotosAnalcime ?

17th Feb 2020 09:20 GMTJoachim Esche Expert

I don't think this are analcimes.
They look more like the head faces of short prismatic natrolites.

17th Feb 2020 11:18 GMTKeith Compton Manager

I would have thought that the transparent crystals were an apophyllite - certainly look like that to me.

17th Feb 2020 12:18 GMTJohan Kjellman Expert

I am not disputing it, but have a hard time seeing what you (both) see.  Could you expand those statements analytically, for example with sketches?


17th Feb 2020 13:31 GMTUwe Kolitsch Manager

Agree with natrolite. At Aris, the latter often show fairly distorted crystals.

17th Feb 2020 19:52 GMTEd Clopton Expert

I don't have a firm opinion on what mineral this is, but I have sketched in a few crystal edges color-coded to represent possible prism edges (yellow) and termination edges (pink) consistent with natrolite.  It's hard to see all the faces and edges, but you get the idea.  Hope this helps--am I on the right track?

17th Feb 2020 20:13 GMTRod Martin Expert

These were labelled as analcimes and I spent some time on this trying to
compare these to the short natrolites. The colour coded one did suggest natrolite and reviewing the specimen again I can now identify similar faces on all the clear crystals. Have reballed the photo as such. Thanks All.

17th Feb 2020 20:41 GMTJoachim Esche Expert

exactly, the pink lines mark the termination and the yellow ones the prism.
The perfect transparency of the crystals does not make the work easy.

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