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Improving Mindat.orgkozoite-(La) & -(Nd) - missing info
17th Nov 2006 05:03 UTCAlan Plante
- Ref: J. Min. Pet. Sci. 98(4), 137 (2003)
Kozoite-(Nd): no crystal class or space group stated, no color stated.
- Ref.: Am. Min. 85, 1076 (2000)
(Since they are members of the Ancylite group, I would expect their class and space group are: dipyramidal, Pmcm. - But this should be checked, of course.)
17th Nov 2006 12:59 UTCJim Ferraiolo
17th Nov 2006 17:31 UTCAlan Plante
It also gives:
- Calcioancylite-(Ce): Pmmm
- Calcioancylite-(Nd): Pm (with a note reinforcing this as being correct.)
- Gysinite-(Nd): Pmcn
(Everything in the table matches what's in the text.)
Zap. Vs. Min. Ob. 126(1), 96 (1997) gives the following:
Ancylite-(La): Pmcn
(Unless I screwed it up when I noted it in my copy of Dana... :~} )
Given all of that, my guess would be that the "Pmcm" in the table is a typo, and the correct space group for ancylite-(Ce) is Pmcn.
But since other space groups are apparently possible for members of the group, I wouldn't be too quick about stating that the two kozoite species are Pmcn...
A close read of the original descriptions is, I think, in order.
Alan
19th Nov 2006 00:47 UTCJim Ferraiolo
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