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Improving Mindat.orgabundance of a mineral and crystals size range
24th Nov 2011 02:18 UTCcascaillou
I mean like 'mostly sub-millimetric', 'usually millimetric', 'unfrequently centimetric, or 'often centimetric' (based on previously reported finds).
To answer this question I usually check the photo gallery, but for some lesser-known minerals the photographic content is too thin to judge of what would have been found around the world.
Another interesting feature would be mentionning the relative abundance of the mineral.
I mean like 'very abundant', 'abundant', 'locally abundant', 'frequent', 'rather rare', 'rare', 'very rare'
Abundance is not only a matter of worldwide occurences, but also a matter how concentrated the mineral is in these regions.
I'm mainly suggesting these two features because when you search mindat, there are just too many minerals, and I often find myself wondering how 'significant' is a given mineral that I had never heard about before, and I guess I'm not the only one feeling a bit lost.
24th Nov 2011 14:58 UTCDavid Von Bargen Manager
5 Methods
6 Crystal habits
7 Colours
8 Fluorescence
9 Quality for species at this locality
10 Rarity at site
11 Comments
12 Reference
Size tends to be incorporated in "Habits"
Unfortunately less than 1% of the entries have any of this information filled in.
24th Nov 2011 15:43 UTCReiner Mielke Expert
24th Nov 2011 17:07 UTCcascaillou
24th Nov 2011 20:17 UTCReiner Mielke Expert
24th Nov 2011 21:13 UTCcascaillou
I'm only suggesting a mention of natural abundance of a given mineral, and crystals size range for a given mineral.
For instance, quartz: 'very abundant', crystals 'often centimetric'.
That would be enough to allow a mineral collector to get a good idea of what he can expect from a given mineral.
I would add that this could also facilitate the use of the mindat search engine by allowing one to eliminate irrelevant minerals from a search.
25th Nov 2011 03:50 UTCAlfredo Petrov Manager
You can get some hints by seeing how many photos have been added for any given mineral at a site. With close to a half million photos on Mindat, growing rapidly, the selection is slowly acquiring some statistical significance. A mineral on a locality list NOT depicted on any photo would seem to indicate that is is either uninteresting or not readily available (with millions of exceptions to be sure ;)
25th Nov 2011 11:25 UTCDavid Von Bargen Manager
For instance, quartz: 'very abundant', crystals 'often centimetric'.
That would be enough to allow a mineral collector to get a good idea of what he can expect from a given mineral."
That is sort of what the "Best Minerals" does.
25th Nov 2011 12:49 UTCReiner Mielke Expert
25th Nov 2011 13:34 UTCJolyon Ralph Founder
26th Nov 2011 03:03 UTCcascaillou
well I was thinking global worldwide, not local.
when I said quartz 'very abundant' crystals 'often centimetric', that was thinking worldwide. This is what a mineral collector can expect from quartz in a general way.
I actually own a mineralogy book that gives that kind of global estimate for each mineral, which I find useful.
26th Nov 2011 14:51 UTCRock Currier Expert
What is the book you have that gives such estimates? Do you know the Handbook of Mineralogy that has for each mineral listed the maximum crystal size known? We try and incorporate these and in some rare instances larger sizes when they are known in the introduction of each mineral in the Best Minerals articles. It would be nice to incorporate in this section a global estimate of its abundance.
26th Nov 2011 15:02 UTCDavid Von Bargen Manager
26th Nov 2011 16:32 UTCErik Vercammen Expert
for the dimensions 4 possibilities:
only microscopic
fine-grained or microcristals
crystals smaller than 3 mm
crystals larger than 3 mm
for the abundance:
common
known from a number of localities and there sometimes rather abundant, but all together rather limited
rare , only known from few places or only a limited number of specimens (or from one locality, where it is relatively abundant)
very rare, only a few specimens known
26th Nov 2011 16:51 UTCcascaillou
I had never noticed that in handbookofmineralogy.org (is that the same book?) , thanks for pointing it to me!
27th Nov 2011 01:58 UTCRock Currier Expert
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