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Hydrokenomicrolite-3R
A structural variant of Hydrokenomicrolite
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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.
First Recorded Locality:
A polytype of Hydrokenomicrolite
An alteration product of microlite crystals, in a decomposed zoned pegmatite,
An alteration product of microlite crystals, in a decomposed zoned pegmatite,
Unique Identifiers
Mindat ID:
47924
Long-form identifier:
mindat:1:1:47924:2
IMA Classification of Hydrokenomicrolite-3R
IMA status 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-3R
Vitreous, Pearly
Colour:
White to pale pink
Streak:
White
Hardness:
4 on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
on {001} and {101}
on {001} and {101}
Optical Data of Hydrokenomicrolite-3R
Type:
Uniaxial
Chemistry of Hydrokenomicrolite-3R
Mindat Formula:
◻2Ta2[O,(OH)]6(H2O)
Elements listed:
Crystallography of Hydrokenomicrolite-3R
Crystal System:
Trigonal
Class (H-M):
3m(32/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-3R
Synonyms of Hydrokenomicrolite-3R
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.
Internet Links for Hydrokenomicrolite-3R
mindat.org URL:
https://www.mindat.org/min-47924.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Hydrokenomicrolite-3R
Localities for Hydrokenomicrolite-3R
Showing 1 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Brazil (FRL) | |
| Ercit et al. (1986) +1 other reference |
