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Yttromicrolite (of Hogarth)

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Formula:
(Ca,Y3+,U,Na)2-x(Ta,Nb,Ti,Fe3+)2O7
Colour:
black to dark-brown
Lustre:
Vitreous
Crystal System:
Isometric
Name:
According to Y content and affiliation to Microlite group.
Hjelmite was first described from Kårarvet Mine near Falun, Sweden by Nordenskiöld (1860) who considered it, on the basis of morphological data, to be a dubious species, possibly related to tapiolite or samarskite.
Hjelmite from Kårarvet was investigated and redefined by Crook (1979) as yttromicrolite. In 1982 in the course of defamation of Crook, yttromicrolite was descredited as an amorphous mixture of calcium sulfate,tantalite and microlites of different composition" Peacor et al(1982). Descreditation wasn't made by proper way.
Modern microprobe investigation of material from the type locality show, that yttromicrolite-(Y) exists within the framework of nomenclature of Hogarth (1977) as yttromicrolite-(Y). According to modern nomenclature of pyrochlore supergroup (Atencio e.a. 2010) investigated specimen fit to yttrian Oxycalciomicrolite, but further investigation of material from the type localty able to result in revalidation of yttromicrolite-(Y).


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Physical Properties of Yttromicrolite (of Hogarth)Hide

Vitreous
Transparency:
Translucent
Colour:
black to dark-brown
Streak:
yellowish

Chemical Properties of Yttromicrolite (of Hogarth)Hide

Formula:
(Ca,Y3+,U,Na)2-x(Ta,Nb,Ti,Fe3+)2O7

Crystallography of Yttromicrolite (of Hogarth)Hide

Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Fd3m
Cell Parameters:
a = 10.179 Å
Unit Cell V:
1,054.67 ų (Calculated from Unit Cell)
Comment:
metamict

Relationship of Yttromicrolite (of Hogarth) to other SpeciesHide

Other Members of this group:
Fluorcalciomicrolite(Ca,Na)2(Ta,Nb)2O6FIso. m3m (4/m 3 2/m) : Fd3m
Fluornatromicrolite(Na1.5Bi0.5)Ta2O6FIso. m3m (4/m 3 2/m) : Fd3m
Hydrokenomicrolite(◻,H2O)2Ta2(O,OH)6(H2O)Iso. m3m (4/m 3 2/m)
Hydromicrolite(H2O,◻)2Ta2(O,OH)6(H2O)
HydroxycalciomicroliteCa1.5Ta2O6(OH)Iso. 4 3 2 : P42 3 2
Hydroxykenomicrolite(◻,Na,Sb3+)2Ta2O6(OH)Iso.
Kenoplumbomicrolite(Pb,◻)2Ta2O6(◻,OH,O)Iso.
OxycalciomicroliteCa2Ta2O6O
OxystannomicroliteSn2Ta2O6O
Oxystibiomicrolite(Sb3+,Ca)2Ta2O6O

Common AssociatesHide

Associated Minerals Based on Photo Data:
Orthoclase1 photo of Yttromicrolite (of Hogarth) associated with Orthoclase on mindat.org.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Yttromicrolite (of Hogarth)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Nordenskjöld, A.E. (1860): Beitrag zur Kenntnis von in Schweden vorkommenden Yttrotantal- und Yttroniob-Mineralien, Annalen der Physik und Chemie, 187(111): 278-? [as hjelmite]
Crook W.W. (1979): Yttromicrolite, a new mineral, and a redefinition of hjelmite. American Mineralogist. 64: 890-892.
Peacor D.R., Simmons W.B., Essene E.J., Heinrich E.W. (1982): New data on and discreditation of "texasite", "albrittonite", "cuproartinite","cuprohydromagnesite", and "yttromicrolite" with corrected data on nickelbischofite, rowlandite and yttrocrasite. American Mineralogist. 67, 156-169.

Internet Links for Yttromicrolite (of Hogarth)Hide

Localities for Yttromicrolite (of Hogarth)Hide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Finland
 
  • Western and Inner Finland Region
    • Valkeakoski
Pavel M. Kartashov analytical data of 2017, Jyrki Autio materials
Sweden
 
  • Dalarna
    • Falun
      • Kårarvet (Kararfvet; Korarfvet)
Pavel M. Kartashov analytical data (2013)
Mineral and/or Locality  
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