Help mindat.org|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on MindatThe Mindat Store
Minerals by PropertiesMinerals by ChemistryRandom MineralSearch by minIDLocalities Near MeSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportAdd Glossary Item
StatisticsMember ListBooks & MagazinesMineral Shows & EventsThe Mindat DirectoryHow to Link to MindatDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Thadeuite

This page is currently not sponsored. Click here to sponsor this page.
Décio Thadeu
Formula:
Ca(Mg,Fe2+)3(PO4)2(OH,F)2
System:
Orthorhombic
Colour:
yellow-orange, brown
Hardness:
3½ - 4
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 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
mindat.org URL:
http://www.mindat.org/min-3929.html
Please feel free to link to this page.

First Recorded Occurrence of Thadeuite

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

Physical Properties of Thadeuite

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

Crystallography of Thadeuite

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

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
Essential elements:
All elements listed in formula:

Relationship of Thadeuite to other Species

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.15DrugmanitePb(Fe3+,Al)2(PO4)2(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+)2Fe23+(PO4)3(OH)3
8.BH.20JohntomaiteBaFe22+Fe23+(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.30CarminitePbFe23+(AsO4)2(OH)2
8.BH.30SewarditeCaFe23+(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.35NickelaustiniteCa(Ni,Zn)(AsO4)(OH)
8.BH.35TangeiteCaCu(VO4)(OH)
8.BH.35GottlobiteCaMg(VO4,AsO4)(OH)
8.BH.35HermannroseiteCaCu(PO4)(OH)
8.BH.40ČechitePb(Fe2+,Mn2+)(VO4)(OH)
8.BH.40DescloizitePb(Zn,Cu)(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
19.14.1CyriloviteNaFe33+(PO4)2(OH)4 · 2H2O
19.14.2KidwelliteNaFe93+(PO4)6(OH)11 · 3H2O
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+Fe53+(PO4)4(OH)6 · 2H2O
19.14.7LeucophosphiteKFe23+(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,Fe3+)2(PO4)(OH,O)
19.14.11UshkoviteMgFe23+(PO4)2(OH)2 · 8H2O
19.14.12Garyansellite(Mg,Fe)3(PO4)2(OH,O) · 1.5H2O
19.14.14AnapaiteCa2Fe2+(PO4)2 · 4H2O
19.14.15XanthoxeniteCa4Fe23+(PO4)4(OH)2 · 3H2O
19.14.16CalcioferriteCa2Fe23+(PO4)3(OH) · 7H2O
19.14.17MitridatiteCa2Fe33+(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 Fe23+(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
19.14.27CacoxeniteFe243+Al(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
19.14.33ZaïriteBiFe33+(PO4)2(OH)6

Other Names for Thadeuite

Name in Other Languages:
German:Thadeuit
Spanish:Thadeuita

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:
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

Localities for Thadeuite

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
 
  • Castelo Branco District
    • Covilhã
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.
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.
      • São Francisco de Assis
Mineral and/or Locality  
Copyright © mindat.org 1993-2015, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: February 28, 2015 06:59:53 Page generated: February 27, 2015 17:32:26