Thadeuite
A valid IMA mineral species
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About Thadeuite
Personalities: Décio Thadeu (1919-1995)
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, for his studies on Portuguese ore deposits.
Extremely rare; most of samples are in fact triplite or other visually similar phosphates (Mila et al., 2014).
Unique Identifiers
Mindat ID:
3929
Long-form identifier:
mindat:1:1:3929:7
GUID
(UUID V4):
(UUID V4):
db24fa31-58c6-401d-a87b-6990b2ccd4fb
IMA Classification of Thadeuite
Approved
IMA Formula:
CaMg3(PO4)2(OH,F)2
Approval year:
1978
First published:
1979
Classification of Thadeuite
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
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
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
19 : Phosphates
14 : Phosphates of Fe and other metals
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Thd | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Thadeuite
Dull
Transparency:
Transparent
Colour:
yellow-orange, brown
Streak:
white
Hardness:
3½ - 4 on Mohs scale
Cleavage:
Distinct/Good
{010}
{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.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v strong
Pleochroism:
Non-pleochroic
Chemistry of Thadeuite
Mindat Formula:
Ca(Mg,Fe2+)3(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)
Crystal Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0000859 | Thadeuite | Isaacs A M, Peacor D R (1982) The crystal structure of thadeuite, Mg(Ca,Mn)(Mg,Fe,Mn)2(PO4)2(OH,F)2 American Mineralogist 67 120-125 |  | 1982 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.38 Å | (100) |
| 3.00 Å | (31) |
| 2.793 Å | (31) |
| 2.626 Å | (23) |
| 2.185 Å | (18) |
| 3.61 Å | (16) |
| 1.696 Å | (11) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 22 : Hydration and low-𝑇 subsurface aqueous alteration (see also #23) |
Type Occurrence of Thadeuite
General Appearance of Type Material:
Massive, coarse-grained cleavable material with a vitreous luster.
Place of Conservation of Type Material:
Department of Geology and Mineralogy, University of Michigan, Ann Arbor, Michigan.
National Museum of Natural History (Smithsonian), Washington, D.C., USA, 143141.
National Museum of Natural History (Smithsonian), Washington, D.C., USA, 143141.
Geological Setting of Type Material:
Hydrothermal tin-tungsten veins
Associated Minerals at Type Locality:
Reference:
Isaacs, A., Peacor, D.R., Kelly, W.C. (1979) Thadeuite, Mg(Ca,Mn)(Mg,Fe,Mn)2(PO4)2(OH,F)2, a new mineral from Panasqueira, Portugal. American Mineralogist: 64: 359-361.
Synonyms of Thadeuite
Other Language Names for Thadeuite
Related Minerals - Strunz-mindat Grouping
| 8.BH. | Crimsonite | PbFe3+2(PO4)2(OH)2 |
| 8.BH. | Reznitskyite | CaMg(VO4)F |
| 8.BH. | Cuprozheshengite | Pb4CuZn2(AsO4)2(PO4)2(OH)2 |
| 8.BH. | Zheshengite | Pb4ZnZn2(AsO4)2(PO4)2(OH)2 |
| 8.BH. | Peterchinite | Zn3Zn2(OH)6As[O3(OH)3] |
| 8.BH.10 | Durangite | NaAl(AsO4)F |
| 8.BH.10 | Isokite | CaMg(PO4)F |
| 8.BH.10 | Lacroixite | NaAl(PO4)F |
| 8.BH.10 | Maxwellite | NaFe3+(AsO4)F |
| 8.BH.10 | Panasqueiraite | CaMg(PO4)(OH,F) |
| 8.BH.10 | Kononovite | NaMg(SO4)F |
| 8.BH.10 | Arsenatrotitanite | NaTi(AsO4)O |
| 8.BH.15 | Drugmanite | Pb2(Fe3+,Al)(PO4)(PO3OH)(OH)2 |
| 8.BH.20 | Bjarebyite | (Ba,Sr)(Mn2+,Fe2+,Mg)2Al2(PO4)3(OH)3 |
| 8.BH.20 | Cirrolite | Ca3Al2(PO4)3(OH)3 (?) |
| 8.BH.20 | Kulanite | Ba(Fe2+,Mn2+,Mg)2(Al,Fe3+)2(PO4)3(OH)3 |
| 8.BH.20 | Penikisite | Ba(Mg,Fe2+,Ca)2Al2(PO4)3(OH)3 |
| 8.BH.20 | Perloffite | Ba(Mn2+,Fe2+)2Fe3+2(PO4)3(OH)3 |
| 8.BH.20 | Johntomaite | BaFe2+2Fe3+2(PO4)3(OH)3 |
| 8.BH.20 | Bjarebyite Group | |
| 8.BH.20 | Strontioperloffite | SrMn2+2Fe3+2(PO4)3(OH)3 |
| 8.BH.20 | Plumboperloffite | PbMn2+2Fe3+2(PO4)3(OH)3 |
| 8.BH.25 | Bertossaite | (Li,Na)2(Ca,Fe2+,Mn2+)Al4(PO4)4(OH,F)4 |
| 8.BH.25 | Palermoite | (Li,Na)2(Sr,Ca)Al4(PO4)4(OH)4 |
| 8.BH.25 | Natropalermoite | Na2SrAl4(PO4)4(OH)4 |
| 8.BH.30 | Carminite | PbFe3+2(AsO4)2(OH)2 |
| 8.BH.30 | Sewardite | CaFe3+2(AsO4)2(OH)2 |
| 8.BH.35 | Adelite | CaMg(AsO4)(OH) |
| 8.BH.35 | Arsendescloizite | PbZn(AsO4)(OH) |
| 8.BH.35 | Austinite | CaZn(AsO4)(OH) |
| 8.BH.35 | Cobaltaustinite | CaCo(AsO4)(OH) |
| 8.BH.35 | Conichalcite | CaCu(AsO4)(OH) |
| 8.BH.35 | Duftite | PbCu(AsO4)(OH) |
| 8.BH.35 | Gabrielsonite | PbFe3+(As3+O3)O |
| 8.BH.35 | Nickelaustinite | CaNi(AsO4)(OH) |
| 8.BH.35 | Tangeite | CaCu(VO4)(OH) |
| 8.BH.35 | Duftite-alpha | PbCu(AsO4)(OH) |
| 8.BH.35 | Gottlobite | CaMg(VO4)(OH) |
| 8.BH.35 | Hermannroseite | CaCu(PO4)(OH) |
| 8.BH.40 | Čechite | PbFe2+(VO4)(OH) |
| 8.BH.40 | Descloizite | PbZn(VO4)(OH) |
| 8.BH.40 | Mottramite | PbCu(VO4)(OH) |
| 8.BH.40 | Pyrobelonite | PbMn2+(VO4)(OH) |
| 8.BH.40 | Khorixasite | (Bi0.67◻0.33)Cu(VO4)(OH) |
| 8.BH.45 | Bayldonite | PbCu3(AsO4)2(OH)2 |
| 8.BH.45 | Vésigniéite | BaCu3(VO4)2(OH)2 |
| 8.BH.50 | Paganoite | NiBi(AsO4)O |
| 8.BH.55 | Harrisonite | Ca(Fe2+,Mg)6(PO4)2(SiO4)2 |
| 8.BH.55 | Jagowerite | BaAl2(PO4)2(OH)2 |
| 8.BH.60 | Attakolite | CaMn2+Al4(SiO3OH)(PO4)3(OH)4 |
| 8.BH.65 | Leningradite | PbCu3(VO4)2Cl |
| 8.BH.70 | Katiarsite | KTiO(AsO4) |
| 8.BH.70 | Yurgensonite | K2SnTiO2(AsO4)2 |
| 8.BH.75 | Melanarsite | K3Cu7Fe3+O4(AsO4)4 |
| 8.BH.80 | Moraskoite | Na2Mg(PO4)F |
| 8.BH.80 | Evseevite | Na2Mg(AsO4)F |
| 8.BH.85 | Piccoliite | NaCaMn3+2(AsO4)2O(OH) |
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.
Internet Links for Thadeuite
mindat.org URL:
https://www.mindat.org/min-3929.html
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References for Thadeuite
Localities for Thadeuite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Portugal | |
| |
| Isaacs et al. (1979) +3 other references |
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Panasqueira Mines, São Jorge da Beira, Covilhã, Castelo Branco, Portugal