Uranmicrolite (of Hogarth 1977)
A discredited species name
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About Uranmicrolite (of Hogarth 1977)
Formula:
(Ca,U,Na)2-x(Ta,Nb)2(O,OH)7
U may predominate in the A site, but in such cases x is always >1, which transforms such minerals into "zero-valent dominant" Microlite.
Colour:
Yellowish-brown, greenish-brown, brownish-black, yellow
Lustre:
Waxy, Greasy
Hardness:
5½
Crystal System:
Isometric
Member of:
Name:
Named as a uranium-bearing variety of microlite.
First Recorded Locality:
The uranmicrolite species of Hogarth (1977) and the “djalmaite” of Guimarães (1939) are not rich enough in U to warrant a status as a separate species (Atencio et al. 2010). Included are the samples described as uranmicrolite by Baldwin (1989), Rub et al. (1998), Tindle & Breaks (1998), Novák & Černý (1998), Zhang et al. (2004), Breiter et al. (2007), van Lichtervelde et al. (2007), Uher et al. (2007).
Unique Identifiers
Mindat ID:
4103
Long-form identifier:
mindat:1:1:4103:0
IMA Classification of Uranmicrolite (of Hogarth 1977)
Discredited
Approval history:
Defined as a valid species: IMA Commision nomenclature report (Hogarth 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 Uranmicrolite (of Hogarth 1977)
18.3.2
18 : Niobates and Tantalates
3 : Niobates and tantalates containing U but not rare earths
18 : Niobates and Tantalates
3 : Niobates and tantalates containing U but not rare earths
Physical Properties of Uranmicrolite (of Hogarth 1977)
Waxy, Greasy
Colour:
Yellowish-brown, greenish-brown, brownish-black, yellow
Streak:
Yellow
Hardness:
5½ on Mohs scale
Optical Data of Uranmicrolite (of Hogarth 1977)
Type:
Isotropic
Chemistry of Uranmicrolite (of Hogarth 1977)
Mindat Formula:
(Ca,U,Na)2-x(Ta,Nb)2(O,OH)7
U may predominate in the A site, but in such cases x is always >1, which transforms such minerals into "zero-valent dominant" Microlite.
U may predominate in the A site, but in such cases x is always >1, which transforms such minerals into "zero-valent dominant" Microlite.
Element Weights:
Crystallography of Uranmicrolite (of Hogarth 1977)
Crystal System:
Isometric
First Recorded Occurrence of Uranmicrolite (of Hogarth 1977)
Synonyms of Uranmicrolite (of Hogarth 1977)
Other Language Names for Uranmicrolite (of Hogarth 1977)
Simplified Chinese:黑钽铀矿
Relationship of Uranmicrolite (of Hogarth 1977) to other Species
Member of:
Other Members of Microlite Group:
| Fluorcalciomicrolite | (Ca,Na)2(Ta,Nb)2O6F | Iso. m3m (4/m 3 2/m) : Fd3m |
| Fluornatromicrolite | (Na1.5Bi0.5)Ta2O6F | Iso. m3m (4/m 3 2/m) : Fd3m |
| Hydrokenomicrolite | (◻,H2O)2Ta2(O,OH)6(H2O) | Iso. m3m (4/m 3 2/m) |
| Hydromicrolite | (H2O,◻)2Ta2(O,OH)6(H2O) | |
| Hydroxycalciomicrolite | Ca1.5Ta2O6(OH) | Iso. 4 3 2 : P42 3 2 |
| Hydroxykenomicrolite | (◻,Na,Sb3+)2Ta2O6(OH,Cs) | Iso. m3m (4/m 3 2/m) : Fd3m |
| Hydroxylstibiomicrolite | (Sb,Ca,Na)2(Ta,Nb)2O6(OH) | Iso. |
| Hydroxynatromicrolite | (Na,Bi3+,◻)2Ta2O6(OH) | Iso. m3m (4/m 3 2/m) : Fd3m |
| Kenomicrolite | ◻2Ta2[O4(OH)2]◻ | Iso. m3m (4/m 3 2/m) : Fd3m |
| Kenoplumbomicrolite | (Pb,◻)2Ta2O6(◻,OH,O) | Iso. |
| Oxybismutomicrolite | (Bi1.33◻0.67)Σ2Ta2O6O | Iso. m3m (4/m 3 2/m) : Fd3m |
| Oxycalciomicrolite | Ca2Ta2O6O | Iso. m3m (4/m 3 2/m) : Fd3m |
| Oxystannomicrolite | Sn2Ta2O6O | Iso. m3m (4/m 3 2/m) : Fd3m |
| Oxystibiomicrolite | (Sb3+,Ca)2Ta2O6O | Iso. m3m (4/m 3 2/m) : Fd3m |
| Yttromicrolite (of Hogarth) | (Ca,Y3+,U,Na)2-x(Ta,Nb,Ti,Fe3+)2O7 | Iso. m3m (4/m 3 2/m) : Fd3m |
Common Associates
Associated Minerals Based on Photo Data:
| 6 photos of Uranmicrolite (of Hogarth 1977) associated with Zircon | Zr(SiO4) |
| 4 photos of Uranmicrolite (of Hogarth 1977) associated with Albite | Na(AlSi3O8) |
| 4 photos of Uranmicrolite (of Hogarth 1977) associated with Fersmite | CaNb2O6 |
| 4 photos of Uranmicrolite (of Hogarth 1977) associated with Elbaite | Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH) |
| 3 photos of Uranmicrolite (of Hogarth 1977) associated with Lepidolite | |
| 3 photos of Uranmicrolite (of Hogarth 1977) associated with Kaolinite | Al2(Si2O5)(OH)4 |
| 3 photos of Uranmicrolite (of Hogarth 1977) associated with Strüverite | (Ti,Ta,Fe)O2 |
| 2 photos of Uranmicrolite (of Hogarth 1977) associated with Olenite | NaAl3Al6(Si6O18)(BO3)3O3(OH) |
| 2 photos of Uranmicrolite (of Hogarth 1977) associated with Xenotime Group | |
| 2 photos of Uranmicrolite (of Hogarth 1977) associated with Plumbomicrolite (of Hogarth 1977) |
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 Uranmicrolite (of Hogarth 1977)
mindat.org URL:
https://www.mindat.org/min-4103.html
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Please feel free to link to this page.
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Mineral Dealers:
References for Uranmicrolite (of Hogarth 1977)
Reference List:
Hogarth, D. D. (1977) Classification and nomenclature of the pyrochlore group. American Mineralogist, 62 (5-6) 403-410
Baldwin, Joy R. (1989) Replacement phenomena in tantalum minerals from rare-metal pegmatites in South Africa and Namibia. Mineralogical Magazine, 53 (373) 571-581 doi:10.1180/minmag.1989.053.373.08 [as uranoan microlite]
Localities for Uranmicrolite (of Hogarth 1977)
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.
Argentina | |
| Galliski et al. (2001) |
Australia | |
| PA Wulser collection |
| Personally collected by Ryan Eagle in ... +1 other reference |
Austria | |
| Walter (1998) |
| Niedermayr et al. (1995) |
| Kolitsch et al. (2020) |
Bolivia | |
| Petrov (n.d.) |
Brazil (FRL) | |
| Guimarães (1939) +1 other reference |
| Luis Menezes |
| Lagache et al. (1997) |
| www.mineralienatlas.de (n.d.) | |
| Pavel M. Kartashov analytical data |
| Beurlen et al. (2005) +1 other reference |
| Robinson et al. (1998) | |
| Beurlen et al. (2008) | |
Canada | |
| 153-155. +1 other reference |
| Groat et al. (2003) |
| Tindle et al. (2002) +1 other reference |
| Tindle et al. (1998) |
| Tindle et al. (2002) | |
China | |
| Yunhuai Lin and Shiyang Chen (1985) |
| Tianren Zou et al. (1986) +1 other reference |
Czech Republic | |
| Černý et al. (Weisser Stein) |
| Pauliš P. et al. (Kutna Hora, issue 1) |
| |
| Novák +1 other reference | |
Egypt | |
| Alekseev et al. (2023) |
| Alekseev et al. (2023) | |
Ethiopia | |
| Küster et al. (2009) |
Finland | |
| Sandström et al. (2009) |
Italy | |
| - (n.d.) |
| - (n.d.) |
| - (n.d.) |
| Boscardin +1 other reference |
| Appiani et al. (1995) |
| Piccoli et al. (2007) | |
| Orlandi et al. |
| P. Orlandi et al. (1990) | |
| Orlandi et al. (1997) | |
| Orlandi et al. (1997) | |
Japan | |
| Matsubara et al (1995) |
Kazakhstan | |
| Pavel.M. Kartashov (n.d.) |
Madagascar | |
| Pezzotta (1999) |
Mozambique | |
| Wilson et al. (2000) |
| Wilson et al. (2000) |
Portugal | |
| Dias et al. (2009) |
| Dias et al. (2009) | |
Russia | |
| Alekseev et al. (2023) |
| Lapis 28 (10) +1 other reference |
Rwanda | |
| Pohl et al. (2013) |
| Bertossa (1968) +1 other reference |
Slovakia | |
| Uher |
| Uher et al. (n.d.) |
| Koděra (1986) |
South Africa | |
| Cairncross et al. (1995) |
Sweden | |
| Otter (2004) |
USA | |
| - (1989) |
| Fisher et al. (1) |
| Foord et al. (1989) |
| Tony Albini Collection |
| Bill Barret Coll. Specimen |
| Harold Moritz collection. Former Bruce ... |
| Rocks and Minerals +1 other reference |
| Warner et al. (2009) | |
| Buchholz et al. (2007) |
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