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LocalitiesSerifos Island, Milos, South Aegean, Greece

22nd Apr 2016 17:29 UTCRob Woodside 🌟 Manager

It has been suggested that all the hematite from this island is Mushketovite, the magnetite pseudomorph after hematite. It is easily tested with a magnet. Are all these "hematite roses" from the quartz locality at Avissalos http://www.mindat.org/loc-215526.html ? Is Koundouro http://www.mindat.org/loc-157051.html , or Mega Horio http://www.mindat.org/loc-26823.html , or Aghia Marina http://www.mindat.org/loc-253093.html one of these?

22nd Apr 2016 18:07 UTCJyrki Autio Expert

This is strongly magnetic.

22nd Apr 2016 18:36 UTCAmir C. Akhavan Expert

The one I got is only weakly magnetic (and I used one of these "supermagnets" to test it), no exact locality, just "Seriphos".

A prase specimen the usual stuff on it, with quartz, ferro-actinolite matrix and inclusions (XRD), and weakly magnetic hematite/magnetite.

( ... and while on the island, can we bust the hedenbergite prase myth next, please :-D ? )

22nd Apr 2016 21:44 UTCRob Woodside 🌟 Manager

Thanks Amir, I began to suspect as much when Richard reported his BC locality with otherwise identical looking pockets, some with Hematite and some Mushketovite.

This locality needs some work!

23rd Apr 2016 23:25 UTCEmil Box

I tested some hematite rosettes, balls (mostly from Rolf Hilligloh) with a smaltometer (indicates the thickness of a non-magnetic film on ferromagnetic basic material).

Serifos, Megalo Livadi (direction to Megalo Chorio): some showed weak magnetism on the outside.

Broken rosettes showed strong magnetism inside.

If pseudomorph or hematite on magnetite, perhaps Raman-analyses could help. Broken balls showes an outer layer.

Alpine hematite rosettes showed no magnetism. (Austria: Zillertal, Rauris, Schiedergraben and Cavradi, Switzerland)

An old chinese probe showed weak magnetism.

Hematite blades from Elba, Italy: no magnetism.

I hope it helps.

Milo