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Witzkeite

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About WitzkeiteHide

Thomas Witzke
Formula:
Na4K4Ca(NO3)2(SO4)4·2H2O
Colour:
Colorless
Lustre:
Vitreous
Hardness:
2
Specific Gravity:
2.40
Crystal System:
Monoclinic
Name:
In honour of Dr. Thomas Witzke, German mineralogist, for his work on new, mainly secondary, mineral species.
This page provides mineralogical data about Witzkeite.


Classification of WitzkeiteHide

Approved
Approval Year:
2011

Physical Properties of WitzkeiteHide

Vitreous
Transparency:
Transparent
Colour:
Colorless
Streak:
White
Hardness:
Tenacity:
Brittle
Cleavage:
Distinct/Good
on {001}.
Density:
2.40(2) g/cm3 (Measured)    2.403 g/cm3 (Calculated)

Optical Data of WitzkeiteHide

Type:
Biaxial (-)
RI values:
nα = 1.470(5) nβ = 1.495(5) nγ = 1.510(5)
2V:
Measured: 50° to 70°
Max Birefringence:
δ = 0.040
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of WitzkeiteHide

Formula:
Na4K4Ca(NO3)2(SO4)4·2H2O
IMA Formula:
Na4K4Ca(NO3)2(SO4)4 · 2H2O

Crystallography of WitzkeiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 24.902(2) Å, b = 5.3323(4) Å, c = 17.246(1) Å
β = 94.281(7)°
Ratio:
a:b:c = 4.67 : 1 : 3.234
Unit Cell V:
2283.6 ų
Z:
4
Morphology:
Tabular crystals up to 140 μm in length.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
12.377 (100)
4.134 (19)
3.100 (24)
2.989 (7)
2.851 (6)
2.689 (9)
2.482 (12)
2.068 (54)

Type Occurrence of WitzkeiteHide

General Appearance of Type Material:
Tabular crystals up to 140 μm in length
Place of Conservation of Type Material:
Type material is deposited in the collections of the Mineralogical Museum of the University of Padova, Padova, Italy, catalogue number MMP M10009.
Geological Setting of Type Material:
The oxidation zone of a guano mining field
Associated Minerals at Type Locality:

Synonyms of WitzkeiteHide

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 WitzkeiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Nestola, F., Cámara, F., Chukanov, N.V., Atencio, D., Coutinho, J.M.V., Contreira Filho, R.R. and Fa¨rber, G. (2012) Witzkeite, IMA 2011-084. CNMNC Newsletter No. 12, February 2012, page 153; Mineralogical Magazine, 76, 151-155.
Nestola, F., Cámara, F., Chukanov, N.V., Atencio, D., Coutinho, J.M.V., Contreira Filho, R.R., Farber, G. (2012): Witzkeite: A new rare nitrate-sulphate mineral from a guano deposit at Punta de Lobos, Chile. American Mineralogist: 97: 1783-1787.

Internet Links for WitzkeiteHide

Localities for WitzkeiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - 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.
Chile (TL)
 
  • Tarapacá Region
    • Iquique Province
Nestola, F., Cámara, F., Chukanov, N.V., Atencio, D., Coutinho, J.M.V., Contreira Filho, R.R. and Fa¨rber, G. (2012) Witzkeite, IMA 2011-084. CNMNC Newsletter No. 12, February 2012, page 153; Mineralogical Magazine, 76, 151-155.
Mineral and/or Locality  
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