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Thadeuite

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Décio Thadeu
Formula:
Ca(Mg,Fe2+)3(PO4)2(OH,F)2
Colour:
yellow-orange, brown
Lustre:
Dull
Hardness:
3½ - 4
Specific Gravity:
3.24 - 3.26
Crystal System:
Orthorhombic
Name:
For Professor Décio Thadeu (1919-1995), Professor of Geology, Instituto Superior Técnico, Lisbon, Portugal.
Extremely rare; most of samples are in fact triplite or other visually similar phosphates (Mila et al., 2014).


Classification of Thadeuite

Approved
Approval Year:
1978
8.BH.05

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
H : With medium-sized and large cations, (OH,etc.):RO4 = 1:1
41.5.16.1

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
5 : (AB)2(XO4)Zq
19.14.13

19 : Phosphates
14 : Phosphates of Fe and other metals

Physical Properties of Thadeuite

Transparency:
Transparent
Colour:
yellow-orange, brown
Streak:
white
Hardness:
3½ - 4 on Mohs scale
Cleavage:
Distinct/Good
{010}
Density:
3.24 - 3.26 g/cm3 (Measured)    3.21 g/cm3 (Calculated)

Optical Data of Thadeuite

Type:
Biaxial (-)
RI values:
nα = 1.568 nβ = 1.597 nγ = 1.600
2V:
Measured: 33° , Calculated: 34°
Max Birefringence:
δ = 0.032
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v strong
Pleochroism:
Non-pleochroic

Chemical Properties of Thadeuite

Formula:
Ca(Mg,Fe2+)3(PO4)2(OH,F)2
IMA Formula:
CaMg3(PO4)2(OH,F)2

Crystallography of Thadeuite

Crystal System:
Orthorhombic
Class (H-M):
2 2 2 - Disphenoidal
Space Group:
C2 2 21
Cell Parameters:
a = 6.41 Å, b = 13.56 Å, c = 8.54 Å
Ratio:
a:b:c = 0.473 : 1 : 0.63
Unit Cell V:
742.29 ų (Calculated from Unit Cell)

Type Occurrence of Thadeuite

General Appearance of Type Material:
Massive, coarse-grained cleavable material with a vitreous luster.
Place of Conservation of Type Material:
Smithsonian and Department of Geology and Mineralogy, University of Michigan
Geological Setting of Type Material:
hydrothermal tin-tungsten veins

Synonyms of Thadeuite

Other Language Names for Thadeuite

German:Thadeuit
Spanish:Thadeuita

Related Minerals - Nickel-Strunz Grouping

8.BH.10DurangiteNaAl(AsO4)F
8.BH.10IsokiteCaMg(PO4)F
8.BH.10LacroixiteNaAl(PO4)F
8.BH.10MaxwelliteNaFe3+(AsO4)F
8.BH.10PanasqueiraiteCaMg(PO4)(OH,F)
8.BH.10TilasiteCaMg(AsO4)F
8.BH.15DrugmanitePb2(Fe3+,Al)(PO4)(PO3OH)(OH)2
8.BH.20Bjarebyite(Ba,Sr)(Mn2+,Fe2+,Mg)2Al2(PO4)3(OH)3
8.BH.20CirroliteCa3Al2(PO4)3(OH)3 (?)
8.BH.20KulaniteBa(Fe2+,Mn2+,Mg)2(Al,Fe3+)2(PO4)3(OH)3
8.BH.20PenikisiteBa(Mg,Fe2+,Ca)2Al2(PO4)3(OH)3
8.BH.20PerloffiteBa(Mn2+,Fe2+)2Fe3+2(PO4)3(OH)3
8.BH.20JohntomaiteBaFe2+2Fe3+2(PO4)3(OH)3
8.BH.25Bertossaite(Li,Na)2(Ca,Fe2+,Mn2+)Al4(PO4)4(OH,F)4
8.BH.25Palermoite(Li,Na)2(Sr,Ca)Al4(PO4)4(OH)4
8.BH.30CarminitePbFe3+2(AsO4)2(OH)2
8.BH.30SewarditeCaFe3+2(AsO4)2(OH)2
8.BH.35AdeliteCaMg(AsO4)(OH)
8.BH.35ArsendescloizitePbZn(AsO4)(OH)
8.BH.35AustiniteCaZn(AsO4)(OH)
8.BH.35CobaltaustiniteCaCo(AsO4)(OH)
8.BH.35ConichalciteCaCu(AsO4)(OH)
8.BH.35DuftitePbCu(AsO4)(OH)
8.BH.35GabrielsonitePbFe(AsO4)(OH)
8.BH.35NickelaustiniteCaNi(AsO4)(OH)
8.BH.35TangeiteCaCu(VO4)(OH)
8.BH.35GottlobiteCaMg(VO4,AsO4)(OH)
8.BH.35HermannroseiteCaCu(PO4)(OH)
8.BH.40ČechitePbFe2+(VO4)(OH)
8.BH.40DescloizitePbZn(VO4)(OH)
8.BH.40MottramitePbCu(VO4)(OH)
8.BH.40PyrobelonitePbMn2+(VO4)(OH)
8.BH.45BayldonitePbCu3(AsO4)2(OH)2
8.BH.45VésigniéiteBaCu3(VO4)2(OH)2
8.BH.50PaganoiteNiBi(AsO4)O
8.BH.55JagoweriteBaAl2(PO4)2(OH)2
8.BH.60Attakolite(Ca,Sr)Mn(Al,Fe)4(HPO4,PO4)3(SiO4,PO4)(OH)4
8.BH.65LeningraditePbCu3(VO4)2Cl

Related Minerals - Hey's Chemical Index of Minerals Grouping

19.14.1CyriloviteNaFe3+3(PO4)2(OH)4 · 2H2O
19.14.2KidwelliteNaFe3+9+x(PO4)6(OH)11 · 3H2O, x = 0.33
19.14.3Rosemaryite(Na,Ca,Mn)(Mn,Fe2+)(Fe3+,Mg)Al(PO4)3
19.14.4Wyllieite(Na,Ca,Mn)(Mn,Fe)(Fe,Mg)Al(PO4)3
19.14.5Ferrowyllieite(Na,Ca,Mn)(Fe,Mn)(Fe,Fe,Mg)Al(PO4)3
19.14.6NatrodufréniteNaFe2+Fe3+5(PO4)4(OH)6 · 2H2O
19.14.7LeucophosphiteKFe3+2(PO4)2(OH) · 2H2O
19.14.8Spheniscidite(NH4,K)(Fe3+,Al)2(PO4)2(OH) · 2H2O
19.14.9BurangaiteNaFe2+Al5(PO4)4(OH)6 · 2H2O
19.14.10Satterlyite(Fe2+,Mg,Fe)12(PO4)5(PO3OH)(OH,O)6
19.14.11UshkoviteMgFe3+2(PO4)2(OH)2 · 8H2O
19.14.12Garyansellite(Mg,Fe)3(PO4)2(OH,O) · 1.5H2O
19.14.14AnapaiteCa2Fe2+(PO4)2 · 4H2O
19.14.15XanthoxeniteCa4Fe3+2(PO4)4(OH)2 · 3H2O
19.14.16CalcioferriteCa2Fe3+2(PO4)3(OH) · 7H2O
19.14.17MitridatiteCa2Fe3+3(PO4)3O2 · 3H2O
19.14.18MélonjosephiteCaFe2+Fe3+(PO4)2(OH)
19.14.19DelvauxiteCaFe4(PO4,SO4)2(OH)8 · 4-6H2O not confirmed ·
19.14.20CollinsiteCa2(Mg,Fe2+)(PO4)2 · 2H2O
19.14.21SegeleriteCa2 Mg2 Fe3+2(PO4)4(OH)2 · 8H2O
19.14.22KingsmountiteCa4(Fe2+,Mn2+)Al4(PO4)6(OH)4 · 12H2O
19.14.23VauxiteFe2+Al2(PO4)2(OH)2 · 6H2O
19.14.24MetavauxiteFe2+Al2(PO4)2(OH)2 · 8H2O
19.14.25ParavauxiteFe2+Al2(PO4)2(OH)2 · 8H2O
19.14.26SigloiteFe3+Al2(PO4)2(OH)3 · 7H2O
19.14.27CacoxeniteFe3+24Al(PO4)17O6(OH)12 · 17H2O
19.14.28KoninckiteFe3+PO4 · 3H2O
19.14.29Lazulite(Mg,Fe2+)Al2(PO4)2(OH)2
19.14.30ScorzaliteFe2+Al2(PO4)2(OH)2
19.14.31Souzalite(Mg,Fe2+)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2O
19.14.32Gormanite(Fe2+,Mg)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2O
19.14.33ZaïriteBiFe3+3(PO4)2(OH)6

Fluorescence of Thadeuite

nonfluorescent

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.

References for Thadeuite

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
American Mineralogist (1979): 64: 359-361.
American Mineralogist (1982): 67: 120-125.
Mila, C.C., Salvan, C.M. & Fabre, J. (2014): Panasqueira: Neufunde und Neubestimmungen. Lapis, 39 (7/8), 54-63.

Internet Links for Thadeuite

mindat.org URL:
https://www.mindat.org/min-3929.html
Please feel free to link to this page.

Localities for Thadeuite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Portugal (TL)
 
  • Castelo Branco District
    • Covilhã
American Mineralogist (1979): 64: 359-361; American Mineralogist, Volume 67, pages 854-860, l982; Mila, C.C., Salvan, C.M. & Fabre, J. (2014): Panasqueira: Neufunde und Neubestimmungen. Lapis, 39 (7/8), 54-63.; Isaacs, A.M. and Peacor, D.R. (1982). "The crystal structure of thadeuite Mg(CaMn)(MgFeMn)2(PO4)2(OHF)2." American Mineralogist, 67(1/2),pp:120-125.
      • São Francisco de Assis
Mineral and/or Locality  
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