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IDProjectCategoryView StatusDate SubmittedLast Update
0004296Dwarf FortressGeologypublic2011-03-21 15:192014-07-23 14:43
ReporterUristocrat 
Assigned ToToady One 
PrioritylowSeveritytrivialReproducibilityalways
StatusresolvedResolutionfixed 
PlatformallOSallOS Versionall
Product Version0.31.21 
Target VersionFixed in Version 
Summary0004296: Tanzanite should occur in metamorphic layers, not gabbro.
DescriptionTanzanite is currently listed in the raws like this:

=== RAW ===
not sure about environment, so just copied peridot, which it was first confused for
[INORGANIC:TANZANITE]
[USE_MATERIAL_TEMPLATE:STONE_TEMPLATE]
[MATERIAL_VALUE:20][DISPLAY_COLOR:5:7:1][TILE:15][IS_GEM:tanzanite:STP:OVERWRITE_SOLID]
[ENVIRONMENT_SPEC:GABBRO:CLUSTER_SMALL:100]
=== END RAW ===

That environment is incorrect. My research says that, "Geologically, tanzanite is found in metamorphic rocks, pegmatite rocks, and hydrothermal veins. Geographically, tanzanite is found in only one place in the world, Merelani Hills of Tanzania around Mount Kilimanjaro."

Source: http://www.emporia.edu/earthsci/amber/go336/berg/tanzanite.html [^]
Steps To ReproduceExamine inorganic_stone_gem.txt, search for tanzanite.
Additional InformationI recommend changing the tanzanite entry to this:

[INORGANIC:TANZANITE]
[USE_MATERIAL_TEMPLATE:STONE_TEMPLATE]
[MATERIAL_VALUE:20][DISPLAY_COLOR:5:7:1][TILE:15][IS_GEM:tanzanite:STP:OVERWRITE_SOLID]
[ENVIRONMENT:METAMORPHIC:CLUSTER_SMALL:100]
[SOLID_DENSITY:3350] Range of about 3200 - 3400

For further research on colors and density, see the Density & Color suggestion:
* http://www.bay12forums.com/smf/index.php?topic=80022.0 [^]
* http://dffd.wimbli.com/file.php?id=4005 [^]

All of that data is being made available freely for any use.

The middle of the range for density was not chosen in this instance, because Google now gives me the average of several sources when I search for X "specific gravity" and that was the average given. Note also that DF's density is equivalent to specific gravity * 1000 (and specific gravity is much easier to search for, because it has only one meaning).
Tagsgems, geology, Intentional/Expected?, Probable Quick Fix, raw files
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Attached Files
Issue History
Date ModifiedUsernameFieldChange
2011-03-21 15:19UristocratNew Issue
2011-03-27 20:50UristocratTag Attached: raw files
2011-03-27 20:50UristocratTag Attached: Probable Quick Fix
2011-03-29 01:21UristocratTag Attached: gems
2011-03-29 01:22UristocratTag Attached: geology
2011-03-29 07:27FootkerchiefTag Detached: Probable Quick Fix
2011-03-29 07:27FootkerchiefTag Attached: Intentional/Expected?
2011-03-29 07:38Granite26Note Added: 0016759
2011-03-29 13:36SeraphNote Added: 0016773
2011-04-15 13:20UristocratNote Added: 0017397
2014-01-26 11:22FootkerchiefTag Attached: Probable Quick Fix
2014-03-25 14:29DwarfuAssigned To => Dwarfu
2014-03-25 14:29DwarfuStatusnew => acknowledged
2014-07-23 14:43Toady OneNote Added: 0027351
2014-07-23 14:43Toady OneStatusacknowledged => resolved
2014-07-23 14:43Toady OneResolutionopen => fixed
2014-07-23 14:43Toady OneAssigned ToDwarfu => Toady One

Notes
(0016759)
Granite26   
2011-03-29 07:38   
Doesn't that mean tanzanite should be treated like tazmanian devil's and florida panthers?
(0016773)
Seraph   
2011-03-29 13:36   
It's worth pointing out that there is such a thing as gabbro pegmatite.
(0017397)
Uristocrat   
2011-04-15 13:20   
Does gabbro pegmatite exist in game? There are three different theories on how pegmatites form and it seems like pegmatites themselves are associated with metamorphic regions:

https://secure.wikimedia.org/wikipedia/en/wiki/Pegmatite [^]

"Worldwide, notable pegmatite occurrences are within the major cratons, and within greenschist-facies metamorphic belts. However, pegmatite localities are only well recorded when economic mineralisation is found."

That said, feel free to contribute any other geology you find over on the forums:

http://www.bay12forums.com/smf/index.php?topic=82309.0 [^]
(0027351)
Toady One   
2014-07-23 14:43   
Not sure when this was addressed, but it looks like these changes are already applied.