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Prewittite

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Charles T. Prewitt
Formula:
KPb1.5ZnCu6(SeO3)2O2Cl10
Colour:
Olive green
Lustre:
Vitreous
Specific Gravity:
3.90
Crystal System:
Orthorhombic
Name:
Named in honor of Charles T. Prewitt (b. 1933) in recognition of his important contributions to crystal chemistry of minerals and planetary materials. He was Professor of Crystallography at the Stony Brook campus of the State University of New York and later Director of the Carnegie Institution of Washington’s Geophysical Laboratory.
This page provides mineralogical data about Prewittite.


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Classification of PrewittiteHide

Approved
Approval Year:
2002
First Published:
2013
4.JG.

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
G : Selenites with additional anions, without H2O

Physical Properties of PrewittiteHide

Vitreous
Transparency:
Transparent
Colour:
Olive green
Streak:
Brownish-green
Tenacity:
Brittle
Cleavage:
Perfect
on (010) and (101).
Density:
3.90 g/cm3 (Measured)    3.89 g/cm3 (Calculated)

Optical Data of PrewittiteHide

Type:
Biaxial (-)
Pleochroism:
Visible
Comments:
Has a clear pleochroism: X, Y – olive green, Z – red-brown.

Chemical Properties of PrewittiteHide

Formula:
KPb1.5ZnCu6(SeO3)2O2Cl10
IMA Formula:
KPb1.5ZnCu6O2(SeO3)2Cl10

Crystallography of PrewittiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pnnm
Cell Parameters:
a = 9.132 Å, b = 19.415 Å, c = 13.213 Å
Ratio:
a:b:c = 0.47 : 1 : 0.681
Unit Cell V:
2342.6 ų
Z:
4
Morphology:
Tabular Crystals. Forms observed: {010}, {001}, and {101}.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
8.26(70)
7.63(60)
4.11(90)
3.660(100)
2.996(40)
2.887(50)
2.642(40)
Comments:
From Type Description.

Type Occurrence of PrewittiteHide

General Appearance of Type Material:
Separate tabular crystals up to 0.2 mm in maximum dimension.
Geological Setting of Type Material:
in the fumarole field of the second cinder cone of the North Breach of the Great fissure Tolbachik eruption (1975–1976), Kamchatka peninsula, Russia.
Reference:
Shuvalov, R.R., Vergasova, L.P., Semenova, T.F., Filatov, S.K., Krivovichev, S.V., Siidra, O.I., Rudashevsky, N.S. (2013) Prewittite, KPb1.5Cu6Zn(SeO3)2O2Cl10, a new mineral from Tolbachik fumaroles, Kamchatka peninsula, Russia: description and crystal structure. American Mineralogist: 98: 463–469.

Synonyms of PrewittiteHide

Other Language Names for PrewittiteHide

German:Prewittit

Related Minerals - Nickel-Strunz GroupingHide

4.JG.05GeorgbokiiteCu5(SeO3)2O2Cl2Mon.
4.JG.05ParageorgbokiiteCu5(SeO3)2O2Cl2Mon. 2/m : P21/b
4.JG.10ChloromeniteCu9(SeO3)4O2Cl6Mon.
4.JG.15SofiiteZn2(SeO3)Cl2Orth.
4.JG.20Ilinskite(Na,K)Cu5(SeO3)2O2Cl3Orth. mmm (2/m 2/m 2/m) : Pnma
4.JG.25FrancisiteCu3Bi(SeO3)2O2ClOrth. mmm (2/m 2/m 2/m) : Pmmn
4.JG.30DerriksiteCu4(UO2)(SeO3)2(OH)6
4.JG.35BurnsiteKCdCu2+7(SeO3)2O2Cl9
4.JG.40AllochalcoseliteCu+PbCu2+5(SeO3)2Cl5O2Mon. 2/m : B2/m

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 PrewittiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
IMA approved minerals 2002
Shuvalov, R.R., Vergasova, L.P., Semenova, T.F., Filatov, S.K., Krivovichev, S.V., Siidra, O.I., Rudashevsky, N.S. (2013) Prewittite, KPb1.5Cu6Zn(SeO3)2O2Cl10, a new mineral from Tolbachik fumaroles, Kamchatka peninsula, Russia: description and crystal structure. American Mineralogist: 98: 463–469.

Internet Links for PrewittiteHide

Localities for PrewittiteHide

ⓘ - 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 (TL)
 
  • Kamchatka Oblast
    • Tolbachik volcano
      • Great Fissure eruption (Main Fracture)
Shuvalov, R.R., Vergasova, L.P., Semenova, T.F., Filatov, S.K., Krivovichev, S.V., Siidra, O.I., Rudashevsky, N.S. (2013): Prewittite, KPb1.5Cu6Zn(SeO3)2O2Cl10, a new mineral from Tolbachik fumaroles, Kamchatka peninsula, Russia: description and crystal structure. American Mineralogist, 98, 463–469.
Mineral and/or Locality  
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