Parwelite Mineral Data (original) (raw)

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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Ask about Parwelite here :
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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: