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Identity HelpApatite?

24th Dec 2005 17:53 UTCIlkka Mikkola Expert

Hello

Could this be apatite?

Microprobeanlysis: CaO 38,32 P2O5 37,84 Cl 1 MnO 17,92 Tot 95,12(w%)

This is from a small cavity in beusite-pegmatite.

Regards

Ilkka

24th Dec 2005 22:30 UTCjohan

fairfieldite?

25th Dec 2005 03:34 UTCJohn Dagenais Expert

Yes, according to the Microprobe analysis you have provided it most likely is the variety Mangan-apatite.

25th Dec 2005 05:52 UTCAlan Plante

Chlorapatite var. manganoan?

27th Dec 2005 16:24 UTCPeter Haas Expert

Chloride is unlikely to be dominant. There is still a considerable gap in the mass balance (5% mathematically and up to 7% analytically, considering the intrinsic 2% relative error of instrumental analysis), presumably due to the light elements that are not amenable to EPMA. Both fluoride and hydroxide have roughly half the molecular weight of chloride, so one of these dominates over chloride by far.

27th Dec 2005 16:27 UTCMarco E. Ciriotti Manager

Mn-rich apatite.

27th Dec 2005 17:12 UTCIlkka Mikkola Expert

Have you seen apatite with over 10(w%) MnO?

27th Dec 2005 17:28 UTCAlan Plante

People keep using the word "apatite" as if it were the name of a mineral. It isn't - it is the name of a Mineral Group.


There are: Fluroapatite, Chlorapatite (very rare), Hydroxylapatite (rare), Carbonate-fluorapatite (rare), and Carbonate-hydroxylapatite (rare). These are the species - actual minerals - in the Apatite Group which have the root name in them. They comprise the calcium phosphate subgroup of the Apatite Group.


So when we use "apatite" as a mineral name we are not narrowing down the ID any further than the calcium phosphate subgroup of the Group.


The entire "Mn-apatite" thing was a misnomer from the git-go and should have been dropped from use decades ago. It is Fluorapatite var. manganoan, or - if you prefer - manganoan fluorapatite. But NOT "manganapatite" or "manganoanapatite" or "Mn-apatite." There are no such minerals!


Grumble, growl, snarl - and all that nasty stuff...


:~}


Alan


PS: I agree with Peter that a manganoan chlorapatite is rather unlikely, given how rare true chlorapatite is. It is more likely manganoan fluorapatite.

28th Dec 2005 16:50 UTCjohan

you should get an x-ray of this material as MnO is quite extreme

all best

29th Dec 2005 11:43 UTCIlkka Mikkola Expert

I used the word "apatite" as I dont know the spesies.Mn-apatite is a misnomer but

this could be near "Mn-apatite.The four Ca 1 sites with most of Mn could be richer with Mn than Ca.


Ilkka

29th Dec 2005 18:09 UTCAlan Plante

If it does turn out to be the Mn analog of Fluorapatite you'd have a pickel naming it. - All the hoopla about "manganapatite" and such would probaly mean the CNMMN would reject reviving one of those misnomers (bad memories... :~} ). I also think that since the naming of the calcian apatite series members is based on the dominant anion - F, OH, Cl - they'd probably want it to be something like:


"Fluormanganoanapatite"


UGH!


Of course, you could fool them - name it "George"!


:~}


Alan

29th Dec 2005 18:46 UTCIlkka Mikkola Expert

I shall name it Mn-Alanite for your positive attitude.

It is "apatite" without any special species name.

Regards

Ilkka

This was my first message,I wanted only ask for the apatite with very high MnO

29th Dec 2005 21:43 UTCAlan Plante

Heavens no!!! - The CNMMN would choke on it!


(I do kind of like "George" though...)


:~}


Alan

30th Dec 2005 11:41 UTCUwe Kolitsch Manager

What's the color of this "apatite"? (Mn-bearing varieties are often bluish to greenish.)
 
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