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Delhuyarite-(Ce)

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About Delhuyarite-(Ce)Hide

Fausto de Elhuyar
Formula:
Ce4Mg(Fe3+,W)3□(Si2O7)2O6(OH)2
Colour:
Brown black
Lustre:
Adamantine
Specific Gravity:
5.20 (Calculated)
Crystal System:
Monoclinic
Name:
It is named after Juan (15 June 1754 – 20 September 1796) and Fausto (11 October 1755 – 6 February 1833) de Elhuyar (Delhuyar), chemists and metallurgists, who in 1783 isolated tungsten metal for the first time.
One single known sample.
Delhuyarite-(Ce)has the same structural topology as chevkinite subgroup minerals, e.g. chevkinite-(Ce). It is the only mineral of the group with a significant content of W6+ = 0.89 apfu.In delhuyarite-(Ce), Mg is dominant at the M1 site as in polyakovite-(Ce); the composition of the M2, M3 and M4 sites is [(Fe3+2W□], with M2 being 50% vacant.


Classification of Delhuyarite-(Ce)Hide

Approved
Approval Year:
2016
First Published:
2017

Physical Properties of Delhuyarite-(Ce)Hide

Adamantine
Transparency:
Translucent
Colour:
Brown black
Streak:
Dark brown
Density:
5.20 g/cm3 (Calculated)

Optical Data of Delhuyarite-(Ce)Hide

Type:
Biaxial (-)
Pleochroism:
Visible
Comments:
Black to rust red

Chemical Properties of Delhuyarite-(Ce)Hide

Formula:
Ce4Mg(Fe3+,W)3□(Si2O7)2O6(OH)2
IMA Formula:
Ce4Mg(Fe3+,W)3◻(Si2O7)2O6(OH)2

Crystallography of Delhuyarite-(Ce)Hide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 13.6020(6) Å
β = 100.721(4)°
Ratio:
Unit Cell V:
844.47 ų
Z:
2
Morphology:
Subhedral crystals up to 0.3 mm long

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
10.808(99)
4.611(71)
3.211(100)
3.170(66)
3.037(71)
2.726(91)
2.702(83)
2.187(56)

Type Occurrence of Delhuyarite-(Ce)Hide

General Appearance of Type Material:
Brown-black subhedral crystals up to 0.3 mm long
Place of Conservation of Type Material:
Type material is deposited in the mineralogical collections of the Department of Geosciences, Swedish Museum of Natural History, Box 50007, SE-10405 Stockholm, Sweden, collection number no. NRM 19060375
Empirical Formula of Type Material:
(Ce1.89La.19Nd0.48Pr0.15Sm0.06Gd0.03Y0.03Ca0.184.01(Fe3+2.14W0.89Mg0.80Al0.19Ti0.024.04Si 4.01O20(OH1.96F0.042
Chemical Analysis of Type Material:
La2O314.58 %
Ce2O323.29 %
Pr2O31.89 %
Nd2O36.13 %
Sm2O30.74 %
Gd2O30.37 %
Dy2O30.03 %
Er2O30.04 %
Yb2O30.12 %
Y2O30.22 %
CaO0.76 %
MgO2.43 %
Al2O30.73 %
SiO218.16 %
TiO20.09 %
WO315.53 %
Fe2O312.86 %
H2Ocalc1.33 %
F0.05 %
Cl0.03 %
O=(F, Cl) -0.03 %
Total:99.35 %
Associated Minerals at Type Locality:
Reference:
Holtstam, D., Bindi, L., Hålenius, U., & Andersson, U. B. (2017) DelhuHoltstam, D., Bindi, L., Hålenius, U., Andersson, U.B. (2017): Delhuyarite-(Ce) Ce4Mg(Fe3+2W)□(Si2O7)2O6(OH)2 a new mineral of the chevkinite group, from the Nya Bastnäs Fe–Cu–REE deposit, Sweden. European Journal of Mineralogy: 29: 897-905. DOI: 10.1127/ejm/2017/0029-2635

Synonyms of Delhuyarite-(Ce)Hide

Relationship of Delhuyarite-(Ce) to other SpeciesHide

Other Members of this group:
Chevkinite-(Ce)(Ce,La,Ca,Th)4(Fe2+,Mg)(Fe2+,Ti,Fe3+)2(Ti,Fe3+)2(Si2O7)2O8Mon.
Christofschäferite-(Ce)Ce3CaMnTiFe(3+)Ti2(Si2O7)2O8 Mon. 2/m : P21/m
Dingdaohengite-(Ce)(Ce,La)4Fe2+(Ti,Fe2+,Mg,Fe2+)2Ti2(Si2O7)2O8Mon. 2/m : P21/b
Maoniupingite-(Ce)(Ce,Ca)4(Fe3+,Ti,Fe2+,◻)(Ti,Fe3+,Fe2+,Nb)4(Si2O7)2O8Mon. 2/m : B2/m
Polyakovite-(Ce)(Ce,Ca)4(Mg,Fe2+)(Cr3+,Fe3+)2(Ti,Nb)2(Si2O7)2O8Mon. 2/m : B2/m

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 Delhuyarite-(Ce)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Holtstam, D., Bindi, L., Hålenius, U. and Andersson, U.B. (2017) Delhuyarite-(Ce), IMA 2016-091. CNMNC Newsletter No. 35, February 2017, page 212. Mineralogical Magazine 81: 209–213.
Holtstam, D., Bindi, L., Hålenius, U., Andersson, U.B. (2017) Delhuyarite-(Ce) Ce4Mg(Fe3+2W)□(Si2O7)2O6(OH)2 a new mineral of the chevkinite group, from the Nya Bastnäs Fe–Cu–REE deposit, Sweden. European Journal of Mineralogy: 29: 897-905. DOI: 10.1127/ejm/2017/0029-2635

Internet Links for Delhuyarite-(Ce)Hide

Localities for Delhuyarite-(Ce)Hide

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.
Sweden
 
  • Västmanland
    • Skinnskatteberg
      • Riddarhyttan
Holtstam, D., Bindi, L., Hålenius, U. and Andersson, U.B. (2017) Delhuyarite-(Ce), IMA 2016-091. CNMNC Newsletter No. 35, February 2017, page 212; Mineralogical Magazine, 81, 209–213.
Holtstam, D., Bindi, L., Hålenius, U., Andersson, U.B. (2017): Delhuyarite-(Ce) Ce4Mg(Fe3+2W)□(Si2O7)2O6(OH)2 a new mineral of the chevkinite group, from the Nya Bastnäs Fe–Cu–REE deposit, Sweden. European Journal of Mineralogy: 29: 897-905 DOI: 10.1127/ejm/2017/0029-2635
Mineral and/or Locality  
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