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Yttromicrolite (of Hogarth)

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black to dark-brown
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).

Classification of Yttromicrolite (of Hogarth)

Physical Properties of Yttromicrolite (of Hogarth)

Diaphaneity (Transparency):
black to dark-brown

Crystallography of Yttromicrolite (of Hogarth)

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

Chemical Properties of Yttromicrolite (of Hogarth)

All elements listed in formula:

Relationship of Yttromicrolite (of Hogarth) to other Species

Other Members of Group:

Other Information

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)

Reference List:
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) URL:
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Localities for Yttromicrolite (of Hogarth)

(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
  • Dalarna
    • Falun
      • Kårarvet (Kararfvet; Korarfvet)
Pavel M. Kartashov analytical data (2013)
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