Discussions

╳Discussions

Groups

Recent Images in Discussions

LocalitiesCastle Acre quarry, Newton by Castle Acre, Breckland, Norfolk, England, UK

29th Aug 2016 21:00 UTCBirgitte Bisgaard

Hi Andy.

Very interesting photo of Vivianite on Flint ! Atm we discuss if the same thing can happen here in Denmark.

Could you please enlighten me, how did it deposit on the flint ? From where ?

I presume you are certain it actually is Vivinaite ? How did you find out ?

Do you know where I can find a scientific thesis about it ?

Thanks,

Birgitte

30th Aug 2016 01:55 UTCPaul Brandes 🌟 Manager

Welcome to Mindat, Birgitte!

I realise your message was directed to Andy Thompson, but I'll take a stab at your questions...... :-)

I would believe if it can happen in the UK, it can certainly happen in Denmark under the correct conditions. Because vivianite can form (oxidize) without the need for outside water or oxygen, it can form in a large variety of places included ones where alluvium deposits have replaced organic material such as peat which I'm guessing might be the mechanism for how it forms in this pit. Hopefully someone with more knowledge of that particular area will chime in.

As far as scientific thesis', I found a couple abstracts and an article by our own Alfredo Petrov that I hope will be of some help.

Vivianite formation and its role in phosphorus retention in Lake Ørn, Denmark

Formation of siderite and vivianite and the pore-water composition of a Recent bog sediment in Denmark

A Scientific Study of the Absorption of Evil by Vivianite

30th Aug 2016 21:35 UTCMartin Stolworthy Expert

I'm from Norfolk and vivianite can certainly be found in locations where the conditions are right. I have some in my collection that I found many years ago on mud that had been removed from a field dyke in the River Yare valley near Bawburgh. It was a very temporary exposure as it was gone after the next rain. It is still stable after all these years. I have not collected it from the quarry where Andy got his from but the chalk around Norfolk has plenty of iron which oxidises easily. There was also a small industry in iron phosphate nodules in parts of the border between Norfolk and Suffolk