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Hydrokenomicrolite-3R

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Formula:
2Ta2[O,(OH)]6(H2O)
Colour:
White to pale pink
Lustre:
Vitreous, Pearly
Hardness:
4
Crystal System:
Trigonal
Name:
First described as parabariomicrolite (Ercit et al. 1986), from the Greek for near and its relation to bariomicrolite (sensu lacto). Discredited by IMA in 2016 and showed to be identical to hydrokenomicrolite-3R.
A polytype of Hydrokenomicrolite

An alteration product of microlite crystals, in a decomposed zoned pegmatite,


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Classification of Hydrokenomicrolite-3RHide

Notes:
Redefined by the IMA
Approval History:
Parabariomicrolite was discredited as identical to hydrokenomicrolite-3R by IMA 2016 (Proposal 16-C)

Physical Properties of Hydrokenomicrolite-3RHide

Vitreous, Pearly
Colour:
White to pale pink
Streak:
White
Hardness:
Tenacity:
Brittle
Cleavage:
Distinct/Good
on {001} and {101}

Optical Data of Hydrokenomicrolite-3RHide

Type:
Uniaxial

Chemical Properties of Hydrokenomicrolite-3RHide

Formula:
2Ta2[O,(OH)]6(H2O)

Crystallography of Hydrokenomicrolite-3RHide

Crystal System:
Trigonal
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Space Group:
R3m
Setting:
R3m
Cell Parameters:
a = 7.4290(6) Å, c = 18.505(2) Å
Ratio:
a:c = 1 : 2.491
Unit Cell V:
884.46 ų (Calculated from Unit Cell)
Morphology:
Pseudocubic.
Comment:
R-3m

First Recorded Occurrence of Hydrokenomicrolite-3RHide

Synonyms of Hydrokenomicrolite-3RHide

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 Hydrokenomicrolite-3RHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Ercit, T. S., Hawthorne, F. C., Cerný, P. (1986) Parabariomicrolite, a new species, and its structural relationship to the pyrochlore group, The Canadian Mineralogist 24: 655-663
Atencio, D. (2016): Parabariomicrolite discredited as identical to hydrokenomicrolite-3R. Mineralogical Magazine, 80: 923-924.

Internet Links for Hydrokenomicrolite-3RHide

Localities for Hydrokenomicrolite-3RHide

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.
Brazil (FRL)
 
  • Rio Grande do Norte
    • Borborema mineral province
      • Equador
Ercit, T. S., Hawthorne, F. C., Cerný, P. (1986) Parabariomicrolite, a new species, and its structural relationship to the pyrochlore group, The Canadian Mineralogist 24: 655-663; Atencio, D. (2016): Parabariomicrolite discredited as identical to hydrokenomicrolite-3R. Mineralogical Magazine, 80: 923-924.
 
Mineral and/or Locality  
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