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Parawulffite

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About ParawulffiteHide

Georgiy V. Wulff
Formula:
K5Na3Cu8O4(SO4)8
Colour:
Dark green or deep emerald-green
Lustre:
Vitreous
Hardness:
Specific Gravity:
3.35
Crystal System:
Monoclinic
Name:
After its relation to wulffite. Para, after the greek παρά, beside and wulffite (which is named in honor of the Russian crystallographer Georgiy Viktorovich Wulff (1863–1925)).
Related to wulffite both chemically and structurally. One of four K-Na-Cu sulfate minerals beside euchlorine, piypite, and wulffite.

Structure details: (1) the heteropolyhedral quasi-framework of Cu–O–S, along [010], and Na(1)O6 octahedra chains ; (2) Cu–O–S chains comprise Cu-centered square pyramids ([4+1] coordination of Cu) and sulfate tetrahedra; (3) different ratios of alkali cations and their arrangement in cavities of the quasi-framework when compared to wulffite; (4) different configuration of Cu–O–S chains than that in wulffite.



Classification of ParawulffiteHide

Approved
Approval Year:
2013

Pronounciation of ParawulffiteHide

Pronounciation:
PlayRecorded byCountry
Jolyon RalphUnited Kingdom

Physical Properties of ParawulffiteHide

Vitreous
Transparency:
Transparent
Colour:
Dark green or deep emerald-green
Streak:
Light green
Hardness:
2½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
one parallel to elongation, second coplanar with (010)
Comment:
Laminated fracture
Density:
3.35(2) g/cm3 (Measured)    3.32 g/cm3 (Calculated)

Optical Data of ParawulffiteHide

Type:
Biaxial (+)
RI values:
nα = 1.585(3) nγ = 1.717(4)
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Max Birefringence:
δ = 0.132
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Comments:
Very strong, deep emerald-green (Z), very pale green (almost colourless) (X), Z > X

Chemical Properties of ParawulffiteHide

Formula:
K5Na3Cu8O4(SO4)8
Common Impurities:
Rb,Cs

Crystallography of ParawulffiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P2/b
Setting:
P2/c
Cell Parameters:
a = 13.904(1) Å, b = 4.9765(3) Å, c = 23.586(2) Å
γ = 90.209(6)°
Ratio:
a:b:c = 2.794 : 1 : 4.739
Unit Cell V:
1631.98 ų
Z:
2
Morphology:
imperfect prismatic crystals up to 0.4 × 0.2 mm, in clusters and crusts; [010] elongation often observed; commonly curved, blocky character

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
9.06(100)
7.00(23)
5.903(12)
3.096(31)
2.736(33)
2.674(11)
2.492(24)
2.321(26)
Comments:
From Type Description.

Type Occurrence of ParawulffiteHide

General Appearance of Type Material:
crude crystals or irregularly shaped
grains
Place of Conservation of Type Material:
Type material is deposited in the collections of the Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia, registration number 4386/1
Geological Setting of Type Material:
incrustations on basalt scoria and on hematite
Associated Minerals at Type Locality:

Synonyms of ParawulffiteHide

Other InformationHide

IR Spectrum:
[cm-1]: 1212s, 1202s,
1149s, 1116s (asymmetric stretching of sulfate), 1036s, 1006s, 981s [symmetric stretching of sulfate), 690, 665, 642,
618, 572, 550 (bending of sulfate), 503, 450 [lattice modes: stretching of shorter bonds in Cu-center
Notes:
slowly dissolves in RT water
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 ParawulffiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Pekov, I.V., Zubkova, N.V., Yapaskurt, V.O., Belakovskiy, D.I., Chukanov, N.V., Lykova, I.S., Sidorov, E.G. and Pushcharovsky, D.Y. (2013) Parawulffite, IMA 2013-036. CNMNC Newsletter No. 17, October 2013, page 2998; Mineralogical Magazine, 77, 2997-3005.
Pekov, I.V., Zubkova, N.V., Yapaskurt, V.O., Belakovskiy, D.I., Chukanov, N.V., Lykova, I.S., Savelyev, D.P., Sidorov, E.G., Pushcharovsky, D.Yu. (2014): Wulffite, K3NaCu4O2(SO4)4, and parawulffite, K5Na3Cu8O4(SO4)8, two new minerals from fumarole sublimates of the Tolbachik Volcano, Kamchatka, Russia. Canadian Mineralogist, 52, 699-716.

Internet Links for ParawulffiteHide

Localities for ParawulffiteHide

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.
Russia
 
  • Far-Eastern Region
    • Kamchatka Oblast'
      • Tolbachik volcano
        • Great Fissure eruption (Main Fracture)
          • Northern Breakthrough (North Breach)
            • Second scoria cone
Dealer label.
Pekov, I.V., Zubkova, N.V., Yapaskurt, V.O., Belakovskiy, D.I., Chukanov, N.V., Lykova, I.S., Sidorov, E.G. and Pushcharovsky, D.Y. (2013) Parawulffite, IMA 2013-036. CNMNC Newsletter No. 17, October 2013, page 2998; Mineralogical Magazine, 77, 2997-3005; Pekov, I.V., Zubkova, N.V., Yapaskurt, V.O., Belakovskiy, D.I., Chukanov, N.V., Lykova, I.S., Savelyev, D.P., Sidorov, E.G., Pushcharovsky, D.Yu. (2014): Wulffite, K3NaCu4O2(SO4)4, and parawulffite, K5Na3Cu8O4(SO4)8, two new minerals from fumarole sublimates of the Tolbachik Volcano, Kamchatka, Russia. Canadian Mineralogist, 52, 699-716
Mineral and/or Locality  
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