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Yttromicrolite (of Hogarth)

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Formula:
(Ca,Y
3+
 
,U,Na)
 
2-x
(Ta,Nb,Ti,Fe
3+
 
)
 
2
O
 
7
System:IsometricColour:black to dark-brown
Member of:Microlite Group > Pyrochlore Supergroup
Name:According to Y content and affiliation to Microlite group.


Hjelmite was first described from Kararfvet Mine near Falun. Sweden by Nordenskiitld (1860) who considered it, on the basis of morphological data, to be a dubious species, possibly related to tapiolite or samarski te.
Hjelmite from Kararfvet was investigated and redefined by Crook (1979) as yttromicrolite.
In 1982 in the course of defamation of Crook yttromicrolite was descredited as mixture of "anhydrite, tantalite and microlites of different composition". 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)

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Physical Properties of Yttromicrolite (of Hogarth)

Lustre:Vitreous
Diaphaneity (Transparency):Translucent
Colour:black to dark-brown
Streak:yellowish

Crystallography of Yttromicrolite (of Hogarth)

Crystal System:Isometric
Class (H-M):m3m (4/m 3 2/m) - Hexoctahedral
Space Group:Fd3m {F41/d 3 2/m}
Cell Parameters:a = 10.179Å
Unit Cell Volume:V 1,054.67 ų (Calculated from Unit Cell)
Comment:metamict

Chemical Properties of Yttromicrolite (of Hogarth)

Formula:
(Ca,Y
3+
 
,U,Na)
 
2-x
(Ta,Nb,Ti,Fe
3+
 
)
 
2
O
 
7
Simplified for copy/paste:(Ca,Y3+,U,Na)2-x(Ta,Nb,Ti,Fe3+)2O7
Essential elements:Ca, O, Ta
All elements listed in formula:Ca, Fe, Na, Nb, O, Ta, Ti, U, Y

Relationship of Yttromicrolite (of Hogarth) to other Species

Member of:Microlite Group > Pyrochlore Supergroup
Other Members of Group:

- +
Fluorcalciomicrolite
(Ca,Na)
 
2
(Ta,Nb)
 
2
O
 
6
F
Fluornatromicrolite
(Na,Ca,Bi)
 
2
Ta
 
2
O
 
6
F
Hydrokenomicrolite
(◻,H
 
2
O)
 
2
Ta
 
2
(O,OH)
 
6
(H
 
2
O)
Hydromicrolite
(H
 
2
O,◻)
 
2
Ta
 
2
(O,OH)
 
6
(H
 
2
O)
Hydroxycalciomicrolite
Ca
 
1
· 5Ta
 
2
O
 
6
(OH)
Hydroxykenomicrolite
(◻,Na,Sb
3+
 
)
 
2
Ta
 
2
O
 
6
(OH)
Kenoplumbomicrolite
(Pb,◻)
 
2
Ta
 
2
O
 
6
(◻,O,OH)
Oxycalciomicrolite
Ca
 
2
Ta
 
2
O
 
6
O
Oxystannomicrolite
Sn
 
2
Ta
 
2
O
 
6
O
Oxystibiomicrolite
(Sb
3+
 
,Ca)
 
2
Ta
 
2
O
 
6
O

Other Information

Health Warning: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:

- +
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)

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  • Localities for Yttromicrolite (of Hogarth)

    (TL) indicates type locality. ? 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.
    Sweden
     
    • Dalarna
      • Falun
        • Kårarvet (Kararfvet; Korarfvet)
    Pavel M. Kartashov analytical data (2013)
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