Help|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on MindatThe Mindat Store
Minerals by PropertiesMinerals by ChemistryRandom MineralSearch by minIDLocalities Near MeSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportAdd Glossary Item
StatisticsMember ListBooks & MagazinesMineral Shows & EventsThe Mindat DirectoryHow to Link to MindatDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Entering other words/letters in formula

Posted by Jolyon Ralph  
Jolyon Ralph
Entering other words/letters in formula
August 18, 2002 02:18PM
Be careful when entering other letters and words in the formula field.

To take a recent example:


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:


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

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

Alan Plante
Re: Entering other words/letters in formula
August 19, 2002 04:40PM
Hi Jolyon

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.


Alan Plante
Re: Entering other words/letters in formula
August 19, 2002 04:46PM
Oh yes -

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.


Jolyon Ralph
Re: Entering other words/letters in formula
August 19, 2002 06:27PM
I'll go through the alpha-minerals etc. changing them at some point!
Jolyon Ralph
Re: Entering other words/letters in formula
August 19, 2002 06:29PM
Oh, what would work is to use lowercase letters eg


The computer wouldn't get confused with that either.
Alan Plante
Re: Entering other words/letters in formula
August 19, 2002 09:01PM

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...

Jolyon Ralph
Re: Entering other words/letters in formula
August 19, 2002 09:45PM


Your Email:


  • Valid attachments: jpg, gif, png, pdf
  • No file can be larger than 1000 KB
  • 3 more file(s) can be attached to this message

Spam prevention:
Please, enter the code that you see below in the input field. This is for blocking bots that try to post this form automatically. If the code is hard to read, then just try to guess it right. If you enter the wrong code, a new image is created and you get another chance to enter it right.

Mineral and/or Locality is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © and the Hudson Institute of Mineralogy 1993-2015, except where stated. relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: March 28, 2015 04:09:38