Parwelite Mineral Data

Parwelite Mineral Data
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General Parwelite Information

Help on Chemical Formula: Chemical Formula: (Mn,Mg)5Sb(As,Si)2O12
Help on Composition: Composition: Molecular Weight = 662.77 gm
   Calcium     1.21 %  Ca    1.69 % CaO
   Magnesium   2.93 %  Mg    4.86 % MgO
   Manganese  34.81 %  Mn   44.95 % MnO
   Silicon     4.24 %  Si    9.07 % SiO2
   Antimony   16.53 %  Sb   21.96 % Sb2O5
   Arsenic    11.30 %  As   17.34 % As2O5
   Oxygen     28.97 %  O
             ______        ______ 
             100.00 %       99.88 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn2+4.2Mg0.8Ca0.2Sb0.9AsSiO12
Help on Environment: Environment: In high-temperature skarn assemblage,, in recrystallized manganoan carbonate ores.
Help on IMA Status: IMA Status: Approved IMA 1968
Help on Locality: Locality: Langban, Varmland, Sweden. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Alexander Parwel, Swedish chemist, Swedish National History Museum, Stockholm, Sweden.
Help on Name Pronunciation: Name Pronunciation: Parwelite + Pronunciation Say PARWELITE
Help on Synonym: Synonym: ICSD 9782
  PDF 29-346
 

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Parwelite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.5174:1:0.5013
Help on Cell Dimensions: Cell Dimensions: a = 10.048, b = 19.418, c = 9.735, Z = 8; beta = 95.83° V = 1,889.59 Den(Calc)= 4.66
Help on Crystal System: Crystal System: Monoclinic - DomaticH-M Symbol (m) Space Group: Aa
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.729(1), 2.916(1), 3.42(0.55),
Click Here for Large Parwelite Structure Window Crystal Structure:

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Marsh R E , Schomaker V , Inorganic Chemistry , 18 (1979) p.2331-2336, Some incorrect space groups in Inorganic Chemistry, Volume 16, Locality: Langban, Sweden

 

Physical Properties of Parwelite

Help on Cleavage: Cleavage: {010} Indistinct
Help on Color: Color: Yellow brown.
Help on Density: Density: 4.62
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: pale yellowish orange
 

Optical Properties of Parwelite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.021 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.012 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1845,KPDmeas= 0.1861,KC= 0.1824
Ncalc = 1.84 - 1.85
Help on Optical Data: Optical Data: Biaxial (+), a=1.85, b=1.85, g=1.88, bire=0.0300, 2V(Calc)=0, 2V(Meas)=27. Dispersion r > v strong.
 

Calculated Properties of Parwelite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.32 gm/cc
note: Specific Gravity of Parwelite =4.66 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0050680456
Boson Index = 0.9949319544
Help on Photoelectric: Photoelectric: PEParwelite = 69.95 barns/electron
U=PEParwelite x rElectron Density= 302.45 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Parwelite is Not Radioactive
 

Parwelite Classification
Help on Dana Class: Dana Class: 44.03.03.01 (44)Antimonates
  (44.03)with miscellaneous formulae
  (44.03.03)Dana Group
 
44.03.03.01 Parwelite (Mn,Mg)5Sb(As,Si)2O12 Aa m
Help on Strunz Class: Strunz Class: 08.BD.15 08 - PHOSPHATES, ARSENATES, VANADATES
  08.B - Phosphates, etc. with Additional Anions, without H2O
  08.BD -With only medium-sized cations, (OH, etc.):RO4 = 2:1
 
08.BD.15 Parwelite (Mn,Mg)5Sb(As,Si)2O12 Aa m
 

Other Parwelite Information
Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Parwelite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Parwelite

(Mn,Mg)5Sb(As,Si)2O12
Dana No: 44.03.03.01 Strunz No: 08.BD.15
Locality:

 

Notes: