Bariomicrolite (of Hogarth 1977)
A variety of Microlite Group
This page is currently not sponsored. Click here to sponsor this page.
Formula:
Ba(Ta,Nb)2(O,OH)7
as given prior to reorganization of the Microlite group.
Colour:
Yellowish to orangish
Lustre:
Resinous, Dull
Hardness:
4½ - 5
Specific Gravity:
5.68 - 5.8
Crystal System:
Isometric
Name:
First named as "rijkeboerite” by van der Veen (1963) honoring the Dutch chemist A. Rijkeboer. The name was replaced with bariomicrolite by Hogarth (1977).
First Recorded Locality:
A discredited mineral. According to the new IMA nomenclature of the Pyrochlore Supergroup the mineral formerly named as bariomicrolite is probably a hydrokenomicrolite. (Atencio et al. 2010).
The type sample apparently has □ dominant at the A position and H2O at the Y position, and as such is probably hydrokenomicrolite.
The bariomicrolite species of Hogarth (1977), the rijkeboerite of van der Veen (1963), is also too poor in Ba to warrant this name. The bariomicrolite studied by Beurlen et al. (2005) is probably also hydrokenomicrolite.
The type sample apparently has □ dominant at the A position and H2O at the Y position, and as such is probably hydrokenomicrolite.
The bariomicrolite species of Hogarth (1977), the rijkeboerite of van der Veen (1963), is also too poor in Ba to warrant this name. The bariomicrolite studied by Beurlen et al. (2005) is probably also hydrokenomicrolite.
Unique Identifiers
Mindat ID:
526 (as Bariomicrolite (of Hogarth 1977))
2705 (as Microlite Group)
2705 (as Microlite Group)
Long-form identifier:
mindat:1:1:526:9 (as Bariomicrolite (of Hogarth 1977))
mindat:1:1:2705:8 (as Microlite Group)
mindat:1:1:2705:8 (as Microlite Group)
IMA Classification of Bariomicrolite (of Hogarth 1977)
Discredited
Approval history:
Approved IMA 1977.
Discredited by IMA 2012 (Atencio et al. 2010; 2012 IMA Report).
Discredited by IMA 2012 (Atencio et al. 2010; 2012 IMA Report).
Classification of Bariomicrolite (of Hogarth 1977)
8.2.2.2
8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
2 : A2B2O6(O,OH,F)
8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
2 : A2B2O6(O,OH,F)
18.1.15
18 : Niobates and Tantalates
1 : Niobates and tantalates containing neither rare earths nor U
18 : Niobates and Tantalates
1 : Niobates and tantalates containing neither rare earths nor U
Physical Properties of Bariomicrolite (of Hogarth 1977)
Resinous, Dull
Transparency:
Opaque
Colour:
Yellowish to orangish
Hardness:
4½ - 5 on Mohs scale
Hardness:
VHN100=485 - 498 - Vickers
Tenacity:
Brittle
Fracture:
Irregular/Uneven
Density:
5.68 - 5.8 g/cm3 (Measured) 5.51 g/cm3 (Calculated)
Optical Data of Bariomicrolite (of Hogarth 1977)
Type:
Isotropic
Chemistry of Bariomicrolite (of Hogarth 1977)
Mindat Formula:
Ba(Ta,Nb)2(O,OH)7
as given prior to reorganization of the Microlite group.
as given prior to reorganization of the Microlite group.
Element Weights:
Crystallography of Bariomicrolite (of Hogarth 1977)
Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Fd3m
Cell Parameters:
a = 10.57 Å
Unit Cell V:
1,180.93 ų (Calculated from Unit Cell)
Z:
8
Morphology:
Intergrowths with microlite
First Recorded Occurrence of Bariomicrolite (of Hogarth 1977)
General Appearance of First Recorded Material:
Intergrowths with microlite, may be partially metamict
Geological Setting of First Recorded Material:
Alluvial concentrates derived from a pegmatite
Associated Minerals at First Recorded Locality:
Synonyms of Bariomicrolite (of Hogarth 1977)
Other Language Names for Bariomicrolite (of Hogarth 1977)
Russian:Бариомикролит
Spanish:Bariomicrolita
Rijkeboerita
Rijkeboerita
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 Bariomicrolite (of Hogarth 1977)
mindat.org URL:
https://www.mindat.org/min-526.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
Mineral Dealers:
References for Bariomicrolite (of Hogarth 1977)
Reference List:
Hogarth, D. D. (1977) Classification and nomenclature of the pyrochlore group. American Mineralogist, 62 (5-6) 403-410 pp.406-407
Localities for Bariomicrolite (of Hogarth 1977)
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) | |
| van der Veen (1963) +1 other reference |
