Be careful when entering other letters and words in the formula field. To take a recent example: Alpha-Zn(OH)^2 would be incorrect, because the element-scanning algorithm that is needed for searching will take the first two letters of Alpha and assume that there is Aluminum in the mineral. If you really need to add extra text to a formula, make sure it is all added as lower case only, so that it will not be detected by the system. Similarly, for generic formula such as: AB^2O^4 The A is fine, but the B would be detected as Boron. Similarly, you can use X but Y would be regarded as yttrium. Jolyon http://www.mindat.org/forum.php?read,10,15452,15452#msg-15452 Thu, 23 May 2013 07:40:28 +0000 Phorum 5.2.15a http://www.mindat.org/forum.php?read,10,15452,15460#msg-15460 http://www.mindat.org/forum.php?read,10,15452,15460#msg-15460
Jolyon]]> Jolyon Ralph Manual Mon, 19 Aug 2002 21:45:00 +0000 http://www.mindat.org/forum.php?read,10,15452,15457#msg-15457 http://www.mindat.org/forum.php?read,10,15452,15457#msg-15457
That might not confuse the computer, but it would sure as heck confuse mineralogists - since "a", "b", and "c" are crystallographic axis symbols...

:~}

Probably best to just avoid letters that are also element symbols...


Alan]]> Alan Plante Manual Mon, 19 Aug 2002 21:01:50 +0000 http://www.mindat.org/forum.php?read,10,15452,15456#msg-15456 http://www.mindat.org/forum.php?read,10,15452,15456#msg-15456
a^2b^3SiO^4

The computer wouldn't get confused with that either.]]> Jolyon Ralph Manual Mon, 19 Aug 2002 18:29:13 +0000 http://www.mindat.org/forum.php?read,10,15452,15455#msg-15455 http://www.mindat.org/forum.php?read,10,15452,15455#msg-15455 Jolyon Ralph Manual Mon, 19 Aug 2002 18:27:52 +0000 http://www.mindat.org/forum.php?read,10,15452,15454#msg-15454 http://www.mindat.org/forum.php?read,10,15452,15454#msg-15454
Regarding the "alpha, beta, ... omega" issue; the convention recommended these days is to use it as a *suffix* - not a prefix. "Roselite-alpha," rather than "alpha-Roselite." And this recommendation is for just the reason you cite: It screws up computer searches when used as a prefix... As a suffix it is more "natural" to leave it uncapitalized - which prevents the computer recognition problem you note - and it won't screw up alphabetical sorts of mineral lists. "Roselite-alpha" ends up in the "Rs" where it belongs.

KOR

Alan]]> Alan Plante Manual Mon, 19 Aug 2002 16:46:51 +0000 http://www.mindat.org/forum.php?read,10,15452,15453#msg-15453 http://www.mindat.org/forum.php?read,10,15452,15453#msg-15453
There are quite a few mineralogists who avoid using single letters that are abbreviations for elements when they write general formulas. There was even a paper written on this problem a few years back - I have a copy of it here.

Basically, any letter that is also used as the abbreviation for an element should NOT be used in general formulas. Not only will it confound a computer, it may confuse a meat-and-blood "computer" as well.

I have long been one of the "offenders" in this matter. I learned "A-B-C..." for cations, and "...X-Y-Z" for anions - and just plain haven't forced myself to un-learn it. But as I have been consulting with Joe M. on the Mineral Groups project, he has pretty much convinced me it is about time I changed my errant ways. My next editing cruise through the Groups list will see "B, C, ... Y" replaced with non-elemental letters.

[PS: That paper I mentioned above was correct in each and every one of its points, but went "a bridge too far" in its proposals for a standardized nomenclature for general formulas. (Too much in one gulp for people to swallow...) I have not seen it being adopted by authors - most likely because it simply went too far. But I hope that it will slowly gain acceptance and become the norm.]

Cheers

Alan]]> Alan Plante Manual Mon, 19 Aug 2002 16:40:53 +0000 http://www.mindat.org/forum.php?read,10,15452,15452#msg-15452 http://www.mindat.org/forum.php?read,10,15452,15452#msg-15452
To take a recent example:

Alpha-Zn(OH)^2

would be incorrect, because the element-scanning algorithm that is needed for searching will take the first two letters of Alpha and assume that there is Aluminum in the mineral.

If you really need to add extra text to a formula, make sure it is all added as lower case only, so that it will not be detected by the system.

Similarly, for generic formula such as:

AB^2O^4

The A is fine, but the B would be detected as Boron.

Similarly, you can use X but Y would be regarded as yttrium.

Jolyon]]> Jolyon Ralph Manual Sun, 18 Aug 2002 14:18:35 +0000