Parwelite Mineral Data

General Parwelite Information

Chemical Formula:

(Mn,Mg)5Sb(As,Si)2O12

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

Empirical Formula:

Mn²⁺_4.2Mg_0.8Ca_0.2Sb_0.9AsSiO₁₂

Environment:

In high-temperature skarn assemblage,, in recrystallized manganoan carbonate ores.

IMA Status:

Approved IMA 1968

Locality:

Langban, Varmland, Sweden. Link to MinDat.org Location Data.

Name Origin:

Named for Alexander Parwel, Swedish chemist, Swedish National History Museum, Stockholm, Sweden.

Name Pronunciation:

Parwelite + Pronunciation

Synonym:

ICSD 9782

PDF 29-346

Parwelite Crystallography

Axial Ratios:

a:b:c =0.5174:1:0.5013

Cell Dimensions:

a = 10.048, b = 19.418, c = 9.735, Z = 8; beta = 95.83° V = 1,889.59 Den(Calc)= 4.66

Crystal System:

Monoclinic - Domatic H-M Symbol (m) Space Group: Aa

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.729(1), 2.916(1), 3.42(0.55),

Physical Properties of Parwelite

Cleavage:

{010} Indistinct

Color:

Yellow brown.

Density:

4.62

Diaphaneity:

Transparent to Translucent

Fracture:

Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

5.5 - Knife Blade

Luster:

Vitreous (Glassy)

Streak:

pale yellowish orange

Optical Properties of Parwelite

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

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

Electron Density:

Bulk Density (Electron Density)=4.32 gm/cc
note: Specific Gravity of Parwelite =4.66 gm/cc.

Fermion Index:

Fermion Index = 0.0050680456
Boson Index = 0.9949319544

Photoelectric:

PE_Parwelite= 69.95 barns/electron
U=PE_Parwelite x rElectron Density= 302.45 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Parwelite is Not Radioactive

Parwelite Classification

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

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

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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

Search for Parwelite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Parwelite :

Ask about Parwelite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Parwelite Specimen Label here :

Parwelite

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

Notes:

Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.