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Parwelite

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About ParweliteHide

Formula:
Mn10Sb2As2Si2O24
Colour:
Yellow-brown, tan
Lustre:
Greasy
Hardness:
Specific Gravity:
4.62
Crystal System:
Monoclinic
Name:
In honour of Dr. Alexander Parwel (June 15, 1906 - 23 December 1978), Swedish chemist, Swedish National History Museum, Stockholm, Sweden, who has performed many analyses of Långban minerals, including this one.
This page provides mineralogical data about Parwelite.


Classification of ParweliteHide

Approved
8.BD.15

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
D : With only medium-sized cations, (OH, etc.):RO4= 2:1
44.3.3.1

44 : ANTIMONATES
3 : Miscellaneous
17.7.18

17 : Silicates Containing other Anions
7 : Silicates with vanadate, arsenate or antimonate

Physical Properties of ParweliteHide

Greasy
Transparency:
Transparent
Colour:
Yellow-brown, tan
Hardness:
5½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Imperfect/Fair
Fair to poor on {010}
Fracture:
Sub-Conchoidal
Density:
4.62 g/cm3 (Measured)    4.64 g/cm3 (Calculated)

Optical Data of ParweliteHide

Type:
Biaxial (+)
RI values:
nα = 1.850(1) nβ = 1.850(1) nγ = 1.880(1)
2V:
Measured: 27° (3)
Max Birefringence:
δ = 0.030
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
r > v strong

Chemical Properties of ParweliteHide

Formula:
Mn10Sb2As2Si2O24
IMA Formula:
Mn2+10Sb5+2As5+2Si2O24
Common Impurities:
Fe,Pb,Ca

Crystallography of ParweliteHide

Crystal System:
Monoclinic
Class (H-M):
m - Domatic
Space Group:
Bb
Cell Parameters:
a = 10.048(2) Å, b = 19.418(5) Å, c = 9.735(5) Å
β = 95.83(1)°
Ratio:
a:b:c = 0.517 : 1 : 0.501
Unit Cell V:
1,889.59 ų (Calculated from Unit Cell)
Z:
8

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.734 (100)
2.915 (95)
4.84 (50)
3.411 (50)
2.422(40)

Type Occurrence of ParweliteHide

General Appearance of Type Material:
Crystals rounded, stubby prismatic, to 1 cm
Place of Conservation of Type Material:
Swedish Museum of Natural History, Stockholm, Sweden, NRMS 26758; National Museum of Natural History, Washington, D.C., USA, 120065
Geological Setting of Type Material:
high temperature skarn
Associated Minerals at Type Locality:

Synonyms of ParweliteHide

Other Language Names for ParweliteHide

German:Parwelit
Spanish:Parwelita

Relationship of Parwelite to other SpeciesHide

Structurally related to group(s):

Common AssociatesHide

Associated Minerals Based on Photo Data:
Långbanite1 photo of Parwelite associated with Långbanite on mindat.org.
Calcite1 photo of Parwelite associated with Calcite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

8.BD.05CornwalliteCu5(AsO4)2(OH)4Mon. 2/m : P21/b
8.BD.05PseudomalachiteCu5(PO4)2(OH)4Mon. 2/m : P21/b
8.BD.05ReichenbachiteCu5(PO4)2(OH)4Mon. 2/m
8.BD.10ArsenoclasiteMn2+5(AsO4)2(OH)4Orth.
8.BD.10GatehouseiteMn2+5(PO4)2(OH)4Orth. 2 2 2 : P21 21 21
8.BD.20ReppiaiteMn2+5(VO4)2(OH)4Mon.
8.BD.25LudjibaiteCu5(PO4)2(OH)4Tric. 1 : P1
8.BD.30CornubiteCu5(AsO4)2(OH)4Tric. 1 : P1

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

17.7.1SuzukiiteBaVSi2O7Orth.
17.7.2FranciscaniteMn2+6(V5+,☐)2(SiO4)2(O,OH)6Hex.
17.7.3Kurumsakite(Zn,Ni,Cu)8Al8V5+2Si5O35 · 27H2O (?)
17.7.4Ardennite-(As)Mn2+4Al4(AlMg)(AsO4)(SiO4)2(Si3O10)(OH)6Orth. mmm (2/m 2/m 2/m)
17.7.5MedaiteMn2+6V5+Si5O18(OH)Mon.
17.7.6JohninnesiteNa2Mn2+9Mg7(OH)8[AsO4]2[Si6O17]2Tric.
17.7.7TiragalloiteMn2+4As5+Si3O12(OH)Mon. 2/m
17.7.8DixeniteCuMn2+14Fe2+(SiO4)2(As5+O4)(As3+O3)5(OH)6Trig.
17.7.9AsbecasiteCa3(Ti,Sn4+)Be2(AsO3)6(SiO4)2Trig. 3m : P3c1
17.7.10McgoverniteMn19Zn3(AsO4)3(AsO3)(SiO4)3(OH)21Trig. 3m (3 2/m)
17.7.11KraissliteZn3(Mn,Mg)25(Fe3+,Al)(As3+O3)2[(Si,As5+)O4]10(OH)16Orth. 2 2 2 : C2 2 21
17.7.12SchalleriteMn2+16As3Si12O36(OH)17Trig. 3m : P3m1
17.7.13Nelenite(Mn,Fe)16(Si12O30)(OH)14[As3+3O6(OH)3]Mon.
17.7.14KoliciteMn2+7Zn4(AsO4)2(SiO4)2(OH)8Orth. mmm (2/m 2/m 2/m) : Cmca
17.7.15YeatmaniteZn6Mn2+9Sb5+2(SiO4)4O12Tric.
17.7.16WelshiteCa4Mg9Sb3O4[Si6Be3AlFe2O36]Tric. 1 : P1
17.7.17Katoptrite(Mn2+,Mg)13(Al,Fe3+)4Sb5+2(SiO4)2O20Mon. 2/m : B2/m
17.7.19LångbaniteMn2+4Mn3+9Sb5+O16(SiO4)2Trig. 3m : P3m1
17.7.20ChapmaniteFe3+2Sb3+(Si2O5)O3(OH)Mon. m : Bm
17.7.21Cervandonite-(Ce)(Ce,Nd,La)(Fe3+,Fe2+,Ti,Al)3O2(Si2O7)(As3+O3)(OH)Trig. 3m : R3m

Other InformationHide

Notes:
It is insoluble in cold 1:1 HCl solution
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 ParweliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Moore P B (1967) Eleven new minerals from Langban, Sweden. The Canadian Mineralogist 9, 301-301
Moore P B (1968) Parwelite, (Mn,Mg)5Sb(Si,As)2O10-11, a new mineral from Långban. Arkiv för Mineralogi och Geologi 4, 467-472
Fleischer M (1970) New mineral names. American Mineralogist 55: 323.
Marsh R E, Schomaker V (1979) Some incorrect space groups in Inorganic Chemistry, Volume 16. Inorganic Chemistry 18, 2331-2336
Bevan, D.J.M. & R.L.Martin (2008) The role of the coordination defect: A new structural description of four fluorite-related sesquioxide minerals, bixbyite, braunite, braunite II, parwelite, and their structural relationships. Journal of Solid State Chemistry 181:2250-2259

Internet Links for ParweliteHide

Localities for ParweliteHide

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.
Sweden (TL)
 
  • Värmland
    • Filipstad
Arkiv Min.Geol.(1969) 4, 467-472; Nysten, P., Holtstam, D. and Jonsson, E. (1999) The Långban minerals. In Långban - The mines,their minerals, geology and explorers (D. Holtstam and J. Langhof, eds.), Swedish Museum of Natural History and Raster Förlag, Stockholm & Chr. Weise Verlag, Munich, pp. 89-183.
Mineral and/or Locality  
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