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Tangdanite

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About TangdaniteHide

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.
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Note: The originally proposed name "fuxiaotuite" (after Fu Xiaotu, Jeffrey de Fourestier's chinese name) was later withdrawn and the species was then named after the type locality (IMA No. 2011-096).

Unique combination of elements (the only Ca-Cu arsenate-sulphate mineral known).


Classification of TangdaniteHide

Approved
Approval Year:
2012

Physical Properties of TangdaniteHide

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}
Parting:
not observed
Fracture:
None observed
Density:
3.22 g/cm3 (Measured)    3.32 g/cm3 (Calculated)
Comment:
meas. by pycnometry

Chemical Properties of TangdaniteHide

Formula:
Ca2Cu9(AsO4)4(SO4)0.5(OH)9 · 9H2O
IMA Formula:
Ca2Cu9(AsO4)4(SO4)0.5(OH)9 · 9H2O

Crystallography of TangdaniteHide

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)°
Ratio:
a:b:c = 9.785 : 1 : 1.88
Unit Cell V:
3157.9 ų
Z:
4

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
27.08 (100)
13.54 (26)
4.801 (4)
4.738 (2)
4.387 (3)
4.308 (3)
4.246 (3)
3.501 (3)
2.840 (3)
2.669 (3)
2.637 (3)
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)".

Type Occurrence of TangdaniteHide

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 TangdaniteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Azurite1 photo of Tangdanite associated with Azurite on mindat.org.
Chalcophyllite1 photo of Tangdanite associated with Chalcophyllite on mindat.org.

Fluorescence of TangdaniteHide

not observed

Other InformationHide

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 TangdaniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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, 1378-1384.
de Fourestier, J., Li, G., Poirier, G., Chukanov, N.V. and Ma, Z. (2012) Fuxiaotuite, IMA 2011-096. CNMNC Newsletter, 13(6), 808.
Mineralogical Magazine, 76, 807-817.
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.
CNMNC Newsletter No. 19, February 2014.

Internet Links for TangdaniteHide

Localities for TangdaniteHide

ⓘ - Click for 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
China (TL)
 
  • Yunnan Province
    • Kunming Prefecture
      • Dongchuan District
        • Dongchuan Cu ore field
de Fourestier, J., Li, G., Poirier, G., Chukanov, N.V. and Ma, Z. (2012) Fuxiaotuite, IMA 2011-096. CNMNC Newsletter, 13(6), 808; 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 of 'clinotyrolite'. Mineralogical Magazine 78, 559-569.
Germany
 
  • Hesse
    • Spessart
      • Freigericht
        • Altenmittlau
Gerstenberg, A., Reinhardt, M. (2017): Nicht nur Azurit - die Mineralien von Altenmittlau im Spessart. Mineralien-Welt 28 (5), 43-59.
Slovakia
 
  • Banská Bystrica Region
    • Banská Bystrica Co.
      • Ľubietová (Libetbánya; Libethen)
Martin Števko-unpublished, PXRD, EMPA-WDS and Raman spectroscopy confirmed;
      • Špania Dolina (Herrengrund)
Martin Števko, unpublished-EMPA-WDS, PXRD, FT-IR and Raman spectroscopy confirmed
  • Košice Region
    • Spišská Nová Ves Co.
      • Spišská Nová Ves (Zipser Neuendorf; Zipser Neudorf; Igló)
        • Novoveská Huta
Martin Števko, unpublished-EMPA-WDS, PXRD, FT-IR and Raman spectroscopy confirmed
Spain
 
  • Valencian Community
    • Castellón
      • Villahermosa del Rio
Excalibur Mineral Company label. Analyzed by Igor Pekov. Fuxiaotuite species still under study.
USA
 
  • Nevada
    • Churchill Co.
      • Table Mountain District
        • Cottonwood Canyon
          • Bolivia
Collection of Alex Earl
  • Utah
    • Utah Co.
      • East Tintic Mts
        • North Tintic District (Caledonia District; Oasis District)
Jason Evans collection.
Mineral and/or Locality  
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