Mindat Logo

Thadeuite

This page is currently not sponsored. Click here to sponsor this page.



Formula:
Ca(Mg,Fe
2+
 
)
 
3
(PO
 
4
)
 
2
(OH,F)
 
2
System:OrthorhombicColour:yellow-orange, brown
Hardness:3½ - 4
Name:
For Professor Décio Thadeu (1919-1995), Professor of Geology, Instituto Superior Técnico, Lisbon, Portugal.
This page provides mineralogical data about Thadeuite.

Classification of Thadeuite

IMA status:Approved 1978
Strunz 8th edition ID:7/B.25-80
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:41.5.16.1

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
5 : (AB)2(XO4)Zq
Hey's CIM Ref.: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.

Type Occurrence of Thadeuite

Type Locality:Panasqueira Mine, Couto Mineiro da Panasqueira, Panasqueira, Covilhã, Castelo Branco District, Portugal
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

Physical Properties of Thadeuite

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

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°
Maximum Birefringence:δ = 0.032

Chart 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,Fe
2+
 
)
 
3
(PO
 
4
)
 
2
(OH,F)
 
2
Simplified for copy/paste:Ca(Mg,Fe2+)3(PO4)2(OH,F)2
Essential elements:Ca, H, Mg, O, P
All elements listed in formula:Ca, F, Fe, H, Mg, O, P

Relationship of Thadeuite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.BH.10Durangite
NaAl(AsO
 
4
)F
8.BH.10Isokite
CaMg(PO
 
4
)F
8.BH.10Lacroixite
NaAl(PO
 
4
)F
8.BH.10Maxwellite
NaFe
3+
 
(AsO
 
4
)F
8.BH.10Panasqueiraite
CaMg(PO
 
4
)(OH,F)
8.BH.10Tilasite
CaMg(AsO
 
4
)F
8.BH.15Drugmanite
Pb(Fe
3+
 
,Al)
 
2
(PO
 
4
)
 
2
(OH)
 
2
8.BH.20Bjarebyite
(Ba,Sr)(Mn
2+
 
,Fe
2+
 
,Mg)
 
2
Al
 
2
(PO
 
4
)
 
3
(OH)
 
3
8.BH.20Cirrolite
Ca
 
3
Al
 
2
(PO
 
4
)
 
3
(OH)
 
3
(?)
8.BH.20Kulanite
Ba(Fe
2+
 
,Mn
2+
 
,Mg)
 
2
(Al,Fe
3+
 
)
 
2
(PO
 
4
)
 
3
(OH)
 
3
8.BH.20Penikisite
Ba(Mg,Fe
2+
 
,Ca)
 
2
Al
 
2
(PO
 
4
)
 
3
(OH)
 
3
8.BH.20Perloffite
Ba(Mn
2+
 
,Fe
2+
 
)
 
2
Fe
3+
2
(PO
 
4
)
 
3
(OH)
 
3
8.BH.20Johntomaite
BaFe
2+
2
Fe
3+
2
(PO
 
4
)
 
3
(OH)
 
3
8.BH.25Bertossaite
(Li,Na)
 
2
(Ca,Fe
2+
 
,Mn
2+
 
)Al
 
4
(PO
 
4
)
 
4
(OH,F)
 
4
8.BH.25Palermoite
(Li,Na)
 
2
(Sr,Ca)Al
 
4
(PO
 
4
)
 
4
(OH)
 
4
8.BH.30Carminite
PbFe
3+
2
(AsO
 
4
)
 
2
(OH)
 
2
8.BH.30Sewardite
CaFe
3+
2
(AsO
 
4
)
 
2
(OH)
 
2
8.BH.35Adelite
CaMg(AsO
 
4
)(OH)
8.BH.35Arsendescloizite
PbZn(AsO
 
4
)(OH)
8.BH.35Austinite
CaZn(AsO
 
4
)(OH)
8.BH.35Cobaltaustinite
CaCo(AsO
 
4
)(OH)
8.BH.35Conichalcite
CaCu(AsO
 
4
)(OH)
8.BH.35Duftite
PbCu(AsO
 
4
)(OH)
8.BH.35Gabrielsonite
PbFe(AsO
 
4
)(OH)
8.BH.35Nickelaustinite
Ca(Ni,Zn)(AsO
 
4
)(OH)
8.BH.35Tangeite
CaCu(VO
 
4
)(OH)
8.BH.35Gottlobite
CaMg(VO
 
4
,AsO
 
4
)(OH)
8.BH.35Hermannroseite
CaCu(PO
 
4
)(OH)
8.BH.40Čechite
Pb(Fe
2+
 
,Mn
2+
 
)(VO
 
4
)(OH)
8.BH.40Descloizite
Pb(Zn,Cu)(VO
 
4
)(OH)
8.BH.40Mottramite
PbCu(VO
 
4
)(OH)
8.BH.40Pyrobelonite
PbMn
2+
 
(VO
 
4
)(OH)
8.BH.45Bayldonite
PbCu
 
3
(AsO
 
4
)
 
2
(OH)
 
2
8.BH.45Vésigniéite
BaCu
 
3
(VO
 
4
)
 
2
(OH)
 
2
8.BH.50Paganoite
NiBi(AsO
 
4
)O
8.BH.55Jagowerite
BaAl
 
2
(PO
 
4
)
 
2
(OH)
 
2
8.BH.60Attakolite
(Ca,Sr)Mn(Al,Fe)
 
4
(HPO
 
4
,PO
 
4
)
 
3
(SiO
 
4
,PO
 
4
)(OH)
 
4
8.BH.65Leningradite
PbCu
 
3
(VO
 
4
)
 
2
Cl
Related Minerals - Hey's Index Grouping:

- +
19.14.1Cyrilovite
NaFe
3+
3
(PO
 
4
)
 
2
(OH)
 
4
· 2H
 
2
O
19.14.2Kidwellite
NaFe
3+
9
(PO
 
4
)
 
6
(OH)
 
11
· 3H
 
2
O
19.14.3Rosemaryite
(Na,Ca,Mn)(Mn,Fe
2+
 
)(Fe
3+
 
,Mg)Al(PO
 
4
)
 
3
19.14.4Wyllieite
(Na,Ca,Mn)(Mn,Fe)(Fe,Mg)Al(PO
 
4
)
 
3
19.14.5Ferrowyllieite
(Na,Ca,Mn)(Fe,Mn)(Fe,Fe,Mg)Al(PO
 
4
)
 
3
19.14.6Natrodufrénite
NaFe
2+
 
Fe
3+
5
(PO
 
4
)
 
4
(OH)
 
6
· 2H
 
2
O
19.14.7Leucophosphite
KFe
3+
2
(PO
 
4
)
 
2
(OH) · 2H
 
2
O
19.14.8Spheniscidite
(NH
 
4
,K)(Fe
3+
 
,Al)
 
2
(PO
 
4
)
 
2
(OH) · 2H
 
2
O
19.14.9Burangaite
NaFe
2+
 
Al
 
5
(PO
 
4
)
 
4
(OH)
 
6
· 2H
 
2
O
19.14.10Satterlyite
(Fe
2+
 
,Mg,Fe
3+
 
)
 
2
(PO
 
4
)(OH,O)
19.14.11Ushkovite
MgFe
3+
2
(PO
 
4
)
 
2
(OH)
 
2
· 8H
 
2
O
19.14.12Garyansellite
(Mg,Fe)
 
3
(PO
 
4
)
 
2
(OH,O) · 1.5H
 
2
O
19.14.14Anapaite
Ca
 
2
Fe
2+
 
(PO
 
4
)
 
2
· 4H
 
2
O
19.14.15Xanthoxenite
Ca
 
4
Fe
3+
2
(PO
 
4
)
 
4
(OH)
 
2
· 3H
 
2
O
19.14.16Calcioferrite
Ca
 
2
Fe
3+
2
(PO
 
4
)
 
3
(OH) · 7H
 
2
O
19.14.17Mitridatite
Ca
 
2
Fe
3+
3
(PO
 
4
)
 
3
O
 
2
· 3H
 
2
O
19.14.18Mélonjosephite
CaFe
2+
 
Fe
3+
 
(PO
 
4
)
 
2
(OH)
19.14.19Delvauxite
CaFe
 
4
(PO
 
4
,SO
 
4
)
 
2
(OH)
 
8
· 4-6H
 
2
O not confirmed ·
19.14.20Collinsite
Ca
 
2
(Mg,Fe
2+
 
)(PO
 
4
)
 
2
· 2H
 
2
O
19.14.21Segelerite
Ca
 
2
Mg
 
2
Fe
3+
2
(PO
 
4
)
 
4
(OH)
 
2
· 8H
 
2
O
19.14.22Kingsmountite
Ca
 
4
(Fe
2+
 
,Mn
2+
 
)Al
 
4
(PO
 
4
)
 
6
(OH)
 
4
· 12H
 
2
O
19.14.23Vauxite
Fe
2+
 
Al
 
2
(PO
 
4
)
 
2
(OH)
 
2
· 6H
 
2
O
19.14.24Metavauxite
Fe
2+
 
Al
 
2
(PO
 
4
)
 
2
(OH)
 
2
· 8H
 
2
O
19.14.25Paravauxite
Fe
2+
 
Al
 
2
(PO
 
4
)
 
2
(OH)
 
2
· 8H
 
2
O
19.14.26Sigloite
Fe
3+
 
Al
 
2
(PO
 
4
)
 
2
(OH)
 
3
· 7H
 
2
O
19.14.27Cacoxenite
Fe
3+
24
Al(PO
 
4
)
 
17
O
 
6
(OH)
 
12
· 17H
 
2
O
19.14.28Koninckite
Fe
3+
 
PO
 
4
· 3H
 
2
O
19.14.29Lazulite
(Mg,Fe
2+
 
)Al
 
2
(PO
 
4
)
 
2
(OH)
 
2
19.14.30Scorzalite
Fe
2+
 
Al
 
2
(PO
 
4
)
 
2
(OH)
 
2
19.14.31Souzalite
(Mg,Fe
2+
 
)
 
3
(Al,Fe
3+
 
)
 
4
(PO
 
4
)
 
4
(OH)
 
6
· 2H
 
2
O
19.14.32Gormanite
(Fe
2+
 
,Mg)
 
3
(Al,Fe
3+
 
)
 
4
(PO
 
4
)
 
4
(OH)
 
6
· 2H
 
2
O
19.14.33Zaïrite
Bi(Fe
3+
 
,Al)
 
3
(PO
 
4
)
 
2
(OH)
 
6

Other Names for Thadeuite

Synonyms:
IMA1978-001
Other Languages:
German:Thadeuit
Russian:Тадеуит
Spanish:Thadeuita

Other Information

Fluorescence in UV light:nonfluorescent
Health Warning: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.

Internet Links for Thadeuite

Search Engines:
  • Look for Thadeuite on Google
  • Look for Thadeuite images on Google
  • External Links:
  • Look for Thadeuite on Webmineral
  • Look for Thadeuite on Athena Mineralogy
  • Look for Thadeuite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Thadeuite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
  • Top quality minerals from Kristalle of California
  • Fine and rare minerals from mintreasure.com
  • Fine Minerals from Weinrich Minerals, Inc.
  • The Arkenstone - Fine Minerals
  • Fabre Minerals - search for Thadeuite specimens
  • Lapis Mineral Magazin
  • Rare and Unusual minerals at Mineralogical Research Company
  • Fine minerals from bisbeeborn.com
  • Find Thadeuite on www.crystalclassics.co.uk
  • Buy fine minerals and gemstones from Pala International
  • rare and unusual minerals mainly crystallized
  • DAKOTA MATRIX offers Cabinet and Rare Species from Worldwide Localities.
  • Jobs:
  • Mining & Geology Jobs
  • Localities for Thadeuite

    The 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. ? 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.
          • Couto Mineiro da Panasqueira
    American Mineralogist (1979): 64: 359-361; American Mineralogist, Volume 67, pages 854-860, l982
        • São Francisco de Assis
    Mineral and/or Locality  
    Search Google  
    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
    Current server date and time: January 5, 2014 02:22:01
    Mineral and Locality Search
    Mineral:
    and/or Locality:
    Options
    Fade toolbar when not in focusFix toolbar to bottom of page
    Hide Social Media Links
    Slideshow frame delay seconds