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Identity HelpAnother unknown from Kipawa

21st Sep 2018 17:27 UTCReiner Mielke Expert

04999520016048558994850.jpg
Anyone have any idea what this might be? Thanks

Colorless, glassy mineral with a good cleavage. Massive, no crystals observed. Hardness 6

21st Sep 2018 17:47 UTCUwe Kolitsch Manager

Baghdadite?

21st Sep 2018 18:14 UTCReiner Mielke Expert

Thank you Uwe for your suggestion. However baghdadite has no cleavage , this has a good one directional cleavage. If it helps any it is fluorescent tan under both LW and SW.

I will pack up a sample for powder XRD this weekend.

21st Sep 2018 18:40 UTCNick Gilly

Calciocatapleiite?

21st Sep 2018 20:05 UTCJeff Weissman Expert

An unusually well crystallized tremolite might fit, the light element Mg would not be detectable by EDS. Wohlerite is another option.

21st Sep 2018 20:06 UTCReiner Mielke Expert

Thanks for the suggestion Nick, however Calciocatapleiite has a hardness of 4½ - 5. This has a hardness of 6.

22nd Sep 2018 00:02 UTCReiner Mielke Expert

05605070016048558994965.jpg
I've figured it out. It is Hiordahlite as per the Handbook of mineralogy formula http://www.handbookofmineralogy.com/pdfs/hiortdahlite.pdf and analysis done in the past by Pavel. Also I rechecked the hardness and it is closer to 5.5 rather than 6. Thanks everyone for your input. I was confused by the lack of Mn but the handbook indicates this is not an essential element unlike the mindat formula. However according to Pavel it is Hiordahlite II As per the EDS below which shows very little Mn



So the question then is should I label it Hiortdahite II or just Hiortdahlite?

22nd Sep 2018 00:11 UTCReiner Mielke Expert

08203900016048558993486.jpg
Just for interest here is a brown one from Kipawa with Mn

 
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