Thadeuite Mineral Data

Thadeuite Mineral Data +

General Thadeuite Information

Chemical Formula:

(Ca,Mn++)(Mg,Fe++,Mn+++)3(PO4)2(OH,F)2

Composition:

Molecular Weight = 368.49 gm

Calcium 10.88 % Ca 15.22 % CaO

Magnesium 14.51 % Mg 24.06 % MgO

Manganese 4.47 % Mn 6.43 % Mn₂O₃

Iron 9.09 % Fe 11.70 % FeO

Phosphorus 16.81 % P 38.52 % P₂O₅

Hydrogen 0.41 % H 3.67 % H₂O

Oxygen 41.25 % O

Fluorine 2.58 % F 2.58 % F

- % F -1.09 % -O=F₂

______ ______

100.00 % 101.09 % = TOTAL OXIDE

Empirical Formula:

CaMg_2.2Fe²⁺_0.6Mn³⁺_0.3(PO₄)₂(OH)_1.5F_0.5

Environment:

Primary mineral in the margins of hydrothermal veins, formed between 230 to 360 deg. C and 100-1,000 bars.

IMA Status:

Approved IMA 1979

Locality:

Panasqueira Sn-W deposit, Portugal. Link to MinDat.org Location Data.

Name Origin:

Namd for Decio Thadeu, Technical University, Lisbon, Portugal, for his studies on Portuguese ore deposits.

Synonym:

ICSD 17052

PDF 33-284

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Thadeuite Crystallography

Axial Ratios:

a:b:c =0.4727:1:0.63

Cell Dimensions:

a = 6.412, b = 13.563, c = 8.545, Z = 4; V = 743.12 Den(Calc)= 3.29

Crystal System:

Orthorhombic - DisphenoidalH-M Symbol (2 2 2) Space Group: C 222₁

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.38(1), 2.793(0.3), 3(0.3),

Crystal Structure:

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Isaacs A M , Peacor D R , American Mineralogist , 67 (1982) p.120-125, The crystal structure of thadeuite, Mg(Ca,Mn)(Mg,Fe,Mn)2(PO4)2(OH,F)2

Physical Properties of Thadeuite

Cleavage:

[010] Perfect, [???] Distinct

Color:

Yellow orange.

Density:

3.25

Diaphaniety:

Translucent

Habit:

Cleaveable - Easily cleaved into fragments.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Hardness:

3.5-4 - Copper Penny-Fluorite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Thadeuite

Gladstone-Dale:

CI meas= 0.119 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.13 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1788,KPDmeas= 0.181,KC= 0.2056

Optical Data:

Biaxial (-), a=1.568, b=1.597, g=1.6, bire=0.0320, 2V(Calc)=34, 2V(Meas)=33.

Calculated Properties of Thadeuite

Electron Density:

r_electron=3.20 gm/cc
note: r_Thadeuite=3.25 gm/cc.

Fermion Index

Fermion Index = 0.01678
Boson Index = 0.98322

Photoelectric:

PE_Thadeuite= 6.30 barns/electron
U=PE_Thadeuite x r_electron= 20.17 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Thadeuite is Not Radioactive

Thadeuite Classification

Dana Class:

41.5.16.1 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.5)where (A B)2 (XO4) Zq

(41.5.16)Dana Group

41.5.16.1 Thadeuite (Ca,Mn)(Mg,Fe,Mn)3(PO4)2(OH,F)2 C 222₁ 2 2 2

Strunz Class:

VII/B.25-80 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O, OH. cations of medium and big size: Mg, Cu, Zn, and Ca, Na, K, Ba, Pb

VII/B.25 - Isokite - Thadeuite series

VII/B.25-10 Isokite CaMg(PO4)F C 2/c 2/m

VII/B.25-20 Panasqueiraite CaMg(PO4)(OH,F) C 2/c 2/m

VII/B.25-30 Tilasite CaMg(AsO4)F C 2/c 2/m

VII/B.25-40 Lacroixite NaAl(PO4)F C 2/c 2/m

VII/B.25-50 Durangite NaAl(AsO4)F C 2/c 2/m

VII/B.25-55 Maxwellite NaFe(AsO4)F Aa,A2/a Mono

VII/B.25-60 Nacaphite Na(Na,Ca)2(PO4)F P1 1

VII/B.25-70 Spodiosite? Ca2(PO4)F Pbcm 2/m 2/m 2/m

VII/B.25-80 Thadeuite (Ca,Mn)(Mg,Fe,Mn)3(PO4)2(OH,F)2 C 222₁ 2 2 2

Other Thadeuite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Thadeuite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Thadeuite

(Ca,Mn++)(Mg,Fe++,Mn+++)3(PO4)2(OH,F)2
Dana No: 41.5.16.1 Strunz No: VII/B.25-80
Locality:

Notes: