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Coutinhoite

A valid IMA mineral species
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04637460014948708522004.jpg
Coutinhoite

Urucum claim, Conselheiro Pena, Minas Gerais, Brazil
05445080014949756537090.jpg
Coutinhoite

Urucum claim, Conselheiro Pena, Minas Gerais, Brazil
06857730014949756539550.jpg
Coutinhoite

Urucum claim, Conselheiro Pena, Minas Gerais, Brazil
06806430014954429521914.jpg
Coutinhoite

Urucum claim, Conselheiro Pena, Minas Gerais, Brazil
05411120014948708524999.jpg
Coutinhoite

Urucum claim, Conselheiro Pena, Minas Gerais, Brazil
06857730014949756539550.jpg
Coutinhoite

Urucum claim, Conselheiro Pena, Minas Gerais, Brazil
04637460014948708522004.jpg
Coutinhoite

Urucum claim, Conselheiro Pena, Minas Gerais, Brazil
05445080014949756537090.jpg
Coutinhoite

Urucum claim, Conselheiro Pena, Minas Gerais, Brazil
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About CoutinhoiteHide

05685800015129005835969.jpg
José Moacyr Vianna Coutinho
Formula:
ThxBa(1-2x)(UO2)2Si5O13 · (H2O)1+y (0 < x < 0.5 and 0 < y < (2+x))
Colour:
yellow
Lustre:
Waxy, Silky
Hardness:
2
Specific Gravity:
3.839 (Calculated)
Crystal System:
Orthorhombic
Name:
Named in honor of José Moacyr Vianna Couthino, (April 4, 1924- June 25, 2021), professor of mineralogy and petrography at the Instituto de Geociências (Institute of Geological Sciences) of University of São Paulo, Brazil.
This page provides mineralogical data about Coutinhoite.


Unique IdentifiersHide

Mindat ID:
26529
Long-form identifier:
mindat:1:1:26529:6
GUID
(UUID V4):
f098e91b-3251-4acf-94c4-39d6d7736759

Classification of CoutinhoiteHide

IMA status:
Approved
Approval year:
2003
First published:
2004
Type description reference:
Atencio, D., Carvalho, F.M.S., Matioli, P.A. (2004) Coutinhoite, a new thorium uranyl silicate hydrate, from Urucum mine, Galileia, Minas Gerais, Brazil. American Mineralogist: 89: 721-724.
Strunz-mindat (2023):
9.AK.30

9 : SILICATES (Germanates)
A : Nesosilicates
K : Uranyl neso- and polysilicates

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
CtiIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of CoutinhoiteHide

Lustre:
Waxy, Silky
Transparency:
Transparent, Translucent
Colour:
yellow
Streak:
yellow
Hardness:
2 on Mohs scale
Tenacity:
Brittle
Density:
3.839 g/cm3 (Calculated)

Optical Data of CoutinhoiteHide

Type:
Biaxial (-)
RI values:
nα = 1.620(3) nβ = 1.627(3) nγ = 1.629(3)
2V:
Measured: 40° (5), Calculated: 56°
Max Birefringence:
δ = 0.009
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
strong r
Pleochroism:
Visible
Comments:
Z>Y, X yellow

Chemical Properties of CoutinhoiteHide

Formula:
ThxBa(1-2x)(UO2)2Si5O13 · (H2O)1+y (0 < x < 0.5 and 0 < y < (2+x))
IMA Formula:
ThxBa1-2x(UO2)2Si5O13 · 3H2O
Elements listed:
Ba, H, O, Si, Th, U - search for minerals with similar chemistry

Crystallography of CoutinhoiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:
a = 14.1675 Å, b = 14.1935 Å, c = 35.754 Å
Ratio:
a:b:c = 0.998 : 1 : 2.519
Unit Cell V:
7189.7 ų
Z:
16
Morphology:
Scales and flakes
Twinning:
Not observed
Comment:
Space Group: Cmmb (probable by analogy to weeksite).

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
7.059 Å(100)
3.528 Å(86)
2.904 Å(78)
3.188 Å(73)
5.563 Å(59)
3.287 Å(57)
3.826 Å(48)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Near-surface Processes
22 : Hydration and low-𝑇 subsurface aqueous alteration (see also #23)
Stage 7: Great Oxidation Event<2.4
47a : [Near-surface hydration of prior minerals]
47f : [Uranyl (U⁶⁺) minerals]

Type Occurrence of CoutinhoiteHide

Type Locality:
ⓘ Urucum claim, Conselheiro Pena, Minas Gerais, Brazil
General Appearance of Type Material:
Fine grained yellow massive material. Flaky crystals 10 microns long by 0.5 microns thick.
Place of Conservation of Type Material:
Museu de Geosciencias, Instituto de Geosciencias, Universidade de Sao Paulo, Rua do Lago, 562, 05505-080, Sao Paulo, SP, Brazil. Catalog number DR523.

Museu Jobas de Ciencias Naturais "Jose Bonifacio de Andrada e Silva," Rua Martim Afonso, 24, Biquinha
Geological Setting of Type Material:
Secondary hydrothermal mineral in a pegmatite
Associated Minerals at Type Locality:
WeeksitePhosphuranyliteMuscoviteMicroclineMetauranocircite
Metauranocircite
Reference:
Atencio, D., Carvalho, F.M.S., Matioli, P.A. (2004) Coutinhoite, a new thorium uranyl silicate hydrate, from Urucum mine, Galileia, Minas Gerais, Brazil. American Mineralogist: 89: 721-724.
Download:
http://rruff.info/doclib/am/vol89/AM89_721.pdf

Synonyms of CoutinhoiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
4 photos of Coutinhoite associated with MuscoviteKAl2(AlSi3O10)(OH)2

Related Minerals - Strunz-mindat GroupingHide

9.AK.OrlitePb3(UO2)3(Si2O7)2 · 6H2O
9.AK.05Soddyite(UO2)2SiO4 · 2H2OOrth. mmm (2/m 2/m 2/m) : Fddd
9.AK.10CuprosklodowskiteCu(UO2)2(SiO3OH)2 · 6H2OTric. 1 : P1
9.AK.10OursiniteCo(UO2)2(SiO3OH)2 · 6H2OOrth. mmm (2/m 2/m 2/m) : Cmca
9.AK.10SklodowskiteMg(UO2)2(SiO3OH)2 · 6H2OMon. 2/m : B2/m
9.AK.15Boltwoodite(K,Na)(UO2)(SiO3OH) · 1.5H2OMon. 2 : P21
9.AK.15KasolitePb(UO2)(SiO4) · H2OMon. 2/m : P21/b
9.AK.15NatroboltwooditeNa(UO2)(SiO3OH) · H2OOrth. 2 2 2 : P21 21 21
9.AK.15ParauranophaneCa(UO2)2(SiO3OH)2 · 5H2OMon. 2/m : P21/b
9.AK.15UranophaneCa(UO2)2(SiO3OH)2 · 5H2OMon. 2 : P21
9.AK.20Swamboite-(Nd)Nd0.333[(UO2)(SiO3OH)](H2O)~2.5Mon. 2/m : P21/b
9.AK.25HaiweeiteCa(UO2)2[Si5O12(OH)2] · 6H2OOrth. mmm (2/m 2/m 2/m) : Pbcn
9.AK.25MetahaiweeiteCa(UO2)2Si6O15 · nH2OMon. 2/m : P2/b
9.AK.30WeeksiteK2(UO2)2(Si5O13) · 4H2OMon. 2/m : B2/m
9.AK.35MagnioursiliteMg4(UO2)4(Si2O5)5(OH)6 · 20H2O
9.AK.35CalcioursiliteCa4(UO2)4(Si2O5)5(OH)6 · 15H2OOrth.
9.AK.40UranosiliteUO3 · 7SiO2Orth.

Fluorescence of CoutinhoiteHide

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.

Internet Links for CoutinhoiteHide

References for CoutinhoiteHide

Reference List:
Atencio, D., Carvalho, F.M.S., Matioli, P.A. (2004) Coutinhoite, a new thorium uranyl silicate hydrate, from Urucum mine, Galileia, Minas Gerais, Brazil. American Mineralogist: 89: 721-724.
Atencio, D., Carvalho, F.M.S., Matioli, P.A. (2004) Coutinhoite, a new thorium uranyl silicate hydrate, from Urucum mine, Galileia, Minas Gerais, Brazil. American Mineralogist: 89: 721-724.

Localities for CoutinhoiteHide

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 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). 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Brazil (TL)
 
  • Minas Gerais
    • Conselheiro Pena
American Mineralogist (2004): 89(5-6): 721-724.
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