Tangdanite
A valid IMA mineral species
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About Tangdanite
Formula:
Ca2Cu9(AsO4)4(SO4)0.5(OH)9 · 9H2O
Colour:
emerald green
Lustre:
Silky, Pearly
Hardness:
2 - 2½
Specific Gravity:
3.22
Crystal System:
Monoclinic
Name:
Named after the type locality.
Type Locality:
Isostructural with:
Closely related to tyrolite (that contains no sulphate, but carbonate instead). In fact, the space group is identical with and the unit-cell parameters are very close to those of the 2M-polytype of tyrolite (C2/c; a = 54.520(6), b = 5.5638(6), c = 10.4647(10) Å, beta = 96.432(9)°; Krivovichev et al., 2006). The "clinotyrolite" was discredited, as it was shown to be identical with tangdanite.
Note: The originally proposed name "fuxiaotuite" (after Fu Xiaotu, Jeffrey de Fourestier's chinese name) was later withdrawn and the species was then named tangdanite after the type locality (IMA No. 2011-096).
Unique combination of elements (the only Ca-Cu arsenate-sulphate mineral known).
Note: The originally proposed name "fuxiaotuite" (after Fu Xiaotu, Jeffrey de Fourestier's chinese name) was later withdrawn and the species was then named tangdanite after the type locality (IMA No. 2011-096).
Unique combination of elements (the only Ca-Cu arsenate-sulphate mineral known).
Unique Identifiers
Mindat ID:
42724
Long-form identifier:
mindat:1:1:42724:9
IMA Classification of Tangdanite
Classification of Tangdanite
8.DM.10
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
M : With large and medium-sized cations, (OH, etc.):RO4 > 2:1
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
M : With large and medium-sized cations, (OH, etc.):RO4 > 2:1
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 for Standard |
|---|---|---|
| Tdn | 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 Tangdanite
Silky, Pearly
Transparency:
Translucent
Colour:
Emerald green
Streak:
Light green
Hardness:
2 - 2½ on Mohs scale
Hardness:
VHN50=42.0 - 43.6 kg/mm2 - Vickers
Tenacity:
Sectile
Cleavage:
Perfect
{100}
{100}
Parting:
not observed
Fracture:
None observed
Density:
3.22 g/cm3 (Measured) 3.32 g/cm3 (Calculated)
Comment:
meas. by pycnometry
Chemistry of Tangdanite
Mindat Formula:
Ca2Cu9(AsO4)4(SO4)0.5(OH)9 · 9H2O
Element Weights:
Crystallography of Tangdanite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 54.490(9) Å, b = 5.5685(9) Å, c = 10.4690(17) Å
β = 96.294(3)°
β = 96.294(3)°
Ratio:
a:b:c = 9.785 : 1 : 1.88
Unit Cell V:
3157.9 ų
Z:
4
Crystal Structure
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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) |
|---|---|---|---|---|---|---|---|
| 0020184 | Tangdanite | Ma Z, Li G, Chukanov N V, Poirier G, Shi N (2014) Tangdanite, a new mineral species from the Yunnan Province, China and the discreditation of 'clinotyrolite' Mineralogical Magazine 78 559-569 | 2014 | Nanniping mine, Dongchuan district, Yunnan Province, China | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 27.08 Å | (100) |
| 13.54 Å | (26) |
| 4.801 Å | (4) |
| 4.738 Å | (2) |
| 4.387 Å | (3) |
| 4.308 Å | (3) |
| 4.246 Å | (3) |
| 3.501 Å | (3) |
| 2.840 Å | (3) |
| 2.669 Å | (3) |
| 2.637 Å | (3) |
Locality:
Comments:
Very similar to the pattern of tyrolite. Calculated data (AMCSD). Comment by Uwe Kolitsch: Ma et al. (2014) list only the following values which totally neglect the high-intensity low-angle d-values: "5.263 (54), 4.782 (100), 4.333 (71), 3.949 (47), 2.976 (46), 2.631 (41), 2.368 (29), 1.744 (24)".
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47b : [Sulfates and sulfites] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] |
Type Occurrence of Tangdanite
General Appearance of Type Material:
flaky crystals, up to 3 mm, flattened || (100) and elongated along [001], in radiating or foliated aggregates
Place of Conservation of Type Material:
Crystal Structure Laboratory, China University of Geosciences, Beijing 100083, People’s Republic of China, catalogue number TD1
Geological Setting of Type Material:
supergene, within oxidized zone (a gossan) of an As-bearing Cu sulfide deposit
Associated Minerals at Type Locality:
Synonyms of Tangdanite
Other Language Names for Tangdanite
Dutch:Tangdaniet
German:Tangdanit
Common Associates
Associations Based on Photo Data:
| 62 photos of Tangdanite associated with Azurite | Cu3(CO3)2(OH)2 |
| 13 photos of Tangdanite associated with Tyrolite | Ca2Cu9(AsO4)4(CO3)(OH)8 · 11H2O |
| 9 photos of Tangdanite associated with Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| 5 photos of Tangdanite associated with Yakhontovite | (Ca,Na)0.5(Cu,Fe,Mg)2(Si4O10)(OH)2 · 3H2O |
| 4 photos of Tangdanite associated with Gypsum | CaSO4 · 2H2O |
| 3 photos of Tangdanite associated with Malachite | Cu2(CO3)(OH)2 |
| 3 photos of Tangdanite associated with Quartz | SiO2 |
| 3 photos of Tangdanite associated with Hemimorphite | Zn4Si2O7(OH)2 · H2O |
| 3 photos of Tangdanite associated with Conichalcite | CaCu(AsO4)(OH) |
| 3 photos of Tangdanite associated with Baryte | BaSO4 |
Related Minerals - Strunz-mindat Grouping
| 8.DM. | Tomsquarryite | NaMgAl3(PO4)2(OH)6 · 8H2O |
| 8.DM. | Elliottite | NaMgAl3(PO4)2F6 · 9H2O |
| 8.DM. | Betpakdalite-FeFe | [Fe3+2 (H2O)15(OH)2Fe3+(H2O)6][Mo8As2Fe3+3O37] |
| 8.DM. | Penriceite | [Mg(H2O)6][Na(H2O)2Al3(PO4)2F6] · H2O |
| 8.DM. | Betpakdalite-CaMg | [Ca2(H2O)17Mg(H2O)6][Mo8As2Fe3+3O36(OH)] |
| 8.DM. | Chinnerite | [Mg(H2O)6]Na(H2O)2Al3(PO4)2F6 |
| 8.DM. | Sarrochite | [Ca4(H2O)38][Mo8P2Fe3+3O37(OH)] |
| 8.DM.05 | Esperanzaite | NaCa2Al2(AsO4)2(OH)F4 · 2H2O |
| 8.DM.05 | Morinite | NaCa2Al2(PO4)2(OH)F4 · 2H2O |
| 8.DM.10 | Alexshubnikovite | Ca2Cu9(AsO4)4(OH)9Cl(H2O)8 · 2H2O |
| 8.DM.10 | Tyrolite | Ca2Cu9(AsO4)4(CO3)(OH)8 · 11H2O |
| 8.DM.15 | Melkovite | [Ca2(H2O)15Ca(H2O)6][Mo8P2Fe3+3O36(OH)] |
| 8.DM.15 | Betpakdalite-NaCa | [Na2(H2O)17Ca(H2O)6][Mo6+8As5+2Fe3+3O34(OH)3] |
| 8.DM.15 | Betpakdalite-CaCa | [Ca2(H2O)17Ca(H2O)6][Mo6+8As5+2Fe3+3O36(OH)] |
| 8.DM.20 | Phosphovanadylite-Ba | Ba[V4+4P2O8(OH)8] · 12H2O |
| 8.DM.20 | Phosphovanadylite-Ca | Ca[V4+4P2O12(OH)4] · 12H2O |
| 8.DM.25 | Yukonite | Ca3Fe3+(AsO4)2(OH)3 · 5H2O |
| 8.DM.30 | Uduminelite | Ca3Al8(PO4)2O12 · 2H2O |
| 8.DM.35 | Aldermanite | [Mg(H2O)6][Na(H2O)2Al3(PO4)2(OH,F)6] · H2O |
| 8.DM.35 | 'Azovskite' | Fe3+3(PO4)(OH)6 or near |
| 8.DM.35 | Delvauxite | CaFe4(PO4,SO4)2(OH)8 · 4-6H2O not confirmed |
| 8.DM.40 | Santafeite | (Na,Ca,Sr)12(Mn2+,Fe3+,Al,Mg)8Mn4+8(VO4)16(OH,O)20 · 8H2O |
| 8.DM.55 | Tapiaite | Ca5Al2(AsO4)4(OH)4 · 12H2O |
| 8.DM.60 | Alcantarillaite | [Fe3+0.5(H2O)4][CaAs3+2(Fe3+2.5W6+0.5)(AsO4)2O7] |
Fluorescence of Tangdanite
not observed
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 Tangdanite
mindat.org URL:
https://www.mindat.org/min-42724.html
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References for Tangdanite
Reference List:
Krivovichev, S. V., Chernyshov, D. Yu., Dobelin, N., Armbruster, Th., Kahlenberg, V., Kaindl, R., Ferraris, G., Tessadri, R., Kaltenhauser, G. (2006) Crystal chemistry and polytypism of tyrolite. American Mineralogist, 91 (8) 1378-1384 doi:10.2138/am.2006.2040
Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2012) New minerals and nomenclature modifications approved in 2012. CNMNC Newsletter No 13. Mineralogical Magazine, 76 (3) 807-817 doi:10.1180/minmag.2012.076.3.26
Frost, Ray L., Xi, Yunfei, Couperthwaite, Sara J. (2012) Vibrational spectroscopic study of multianion mineral clinotyrolite Ca2Cu9[(As,S)O4]4(OH)10·10(H2O) Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 95. 258-262 doi:10.1016/j.saa.2012.04.007(as clinotyrolite)
Zhesheng, Ma, Guowu, Li, Chukanov, N. V., Poirier, G., Nicheng, Shi (2014) Tangdanite, a new mineral species from the Yunnan Province, China and the discreditation of ‘clinotyrolite’. Mineralogical Magazine, 78 (3) 559-569 doi:10.1180/minmag.2014.078.3.06
Localities for Tangdanite
Showing 32 localities.
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.
Austria | |
| Neschen (n.d.) |
| C.Auer (2021) |
China (TL) | |
| Williams et al. (2012) +1 other reference |
| Li et al. (2023) |
Czech Republic | |
| Škácha et al. (2019) |
France | |
| Originally described and analysed as ... +1 other reference |
| Sarp et al. (2000) | |
Germany | |
| Bayerl et al. (04/21) |
| Gerstenberg et al. (2017) |
| Witzke (2024) |
Italy | |
| Bortolozzi et al. (2017) |
| Ciriotti et al. (2019) |
| Fernando Caboni et al. (2024) |
| Fernando Caboni et al. (2024) | |
| Domenico Saccardo et al. (2019) +1 other reference |
Morocco | |
| Favreau (2026) |
| Georges FAVREAU collection & EDX ... |
Russia | |
| Nenasheva et al. (2011) |
Slovakia | |
| Martin Števko-unpublished |
| Martin Števko-unpublished |
| Martin Števko |
| Martin Števko-unpublished +1 other reference |
| Martin Števko |
Spain | |
| Rewitzer et al. (2023) |
| Xavi Ortiz Collection |
| Joan Abella i Creus (Joanabellacreus@gmail.com) |
| Identified by Igor Pekov in 2012 |
| CLAUDE jean marie Collection | |
| Xevi Ortiz collection. | |
Switzerland | |
| Roth et al. (2025) |
USA | |
| Collection of Alex Earl +1 other reference |
| Jason Evans collection |
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Villahermosa del Rio, Castellón, Valencian Community, Spain