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Improving Mindat.orgWrong formula
27th Dec 2016 16:04 UTCReiner Mielke Expert
27th Dec 2016 19:56 UTCErik Vercammen Expert
28th Dec 2016 00:45 UTCAlfredo Petrov Manager
28th Dec 2016 01:08 UTCPavel Kartashov Manager
28th Dec 2016 02:00 UTCAlfredo Petrov Manager
Another issue is that Mindat has the parent species formula for many chemical varieties, without including the relevant varietal element in the formula. The example here is just one of many. It may be a Mindat policy (I'm not sure) to only use parent species' formulae for varieties?
28th Dec 2016 02:46 UTCReiner Mielke Expert
28th Dec 2016 10:44 UTCErik Vercammen Expert
28th Dec 2016 11:02 UTCŁukasz Kruszewski Expert
28th Dec 2016 11:23 UTCErik Vercammen Expert
Argentopentlandite
Ag(Fe,Ni)8S8
A 1970-047
Russia
Zapiski Vsesoyuznogo
Mineralogicheskogo Obshchestva 106
(1977), 688
Canadian Mineralogist 12 (1973), 169
28th Dec 2016 14:38 UTCReiner Mielke Expert
Argentian pentlandite is not the same as argentopentlandite. The formula for pentlandite on the pentlandite group page needs to be changed as well. http://www.mindat.org/min-29321.html
Hello Lukasz,
I made the same mistake as Erik. :-(
28th Dec 2016 15:14 UTCErik Vercammen Expert
my point abotthe argentopentlandite was the fact dat iron dominates here on Ni.
28th Dec 2016 16:17 UTCReiner Mielke Expert
Yes I agree, point taken. However that is not the case with argentian pentlandite.
28th Dec 2016 21:41 UTCRalph S Bottrill 🌟 Manager
I dont know enough about argentopentlandite but its formula implies that Ag only substitutes for one of 9 metal sites in the structure. If not then its a variety of pentlandite, but i havent done any research. This will affect how the formula of agentian pentlandite should be displayed.
Pentlandite should really be divided into two species, one Ni and one Fe dominant, regardless of whether the pure endmembers exist in nature, else the formula is misleading. This change will also affect the formulae of argentpentlandite and argentian pentlandite.
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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: March 28, 2024 16:14:32