Mcgovernite Mineral Data (original) (raw)

General Mcgovernite Information

Help on Chemical Formula: Chemical Formula:

Mn9Mg4Zn2As2Si2O17(OH)14

Help on Composition: Composition:

Molecular Weight = 1,438.55 gm

Magnesium 6.76 % Mg 11.21 % MgO

Manganese 34.37 % Mn 44.38 % MnO

Zinc 9.09 % Zn 11.32 % ZnO

Silicon 3.90 % Si 8.35 % SiO2

Arsenic 10.42 % As 15.98 % As2O5

Hydrogen 0.98 % H 8.77 % H2O

Oxygen 34.48 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Help on Empirical Formula: Empirical Formula:

Mn2+9Mg4Zn2As2Si2O17(OH)14

Help on Environment: Environment:

Metamorphosed zinc-manganese deposit.

Help on IMA Status: IMA Status:

Valid Species (Pre-IMA) 1927

Help on Locality: Locality:

Sterling Hill, Franklin, Sussex Co., New Jersey, USA. Link to MinDat.org Location Data.

Help on Name Origin: Name Origin:

Named for J. J. McGovern (1915-), Franklin miner and mineral collector.

Help on Name Pronunciation: Name Pronunciation:

Mcgovernite + Pronunciation Say MCGOVERNITE

Mcgovernite Image

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Mcgovernite Crystallography

Help on Axial Ratios: Axial Ratios:

a:c = 1:25

Help on Cell Dimensions: Cell Dimensions:

a = 8.22, c = 205.5, Z = 20; V = 12,025.03 Den(Calc)= 3.97

Help on Crystal System: Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3c

Help on X Ray Diffraction: X Ray Diffraction:

By Intensity(I/Io): 1.54(1), 2.35(0.6), 2.66(0.6),2.37(0.5), 2.8(0.5), 3.24(0.3), 3.43(0.3), 4.06(0.3),

Physical Properties of Mcgovernite

Help on Cleavage: Cleavage:

{001} Perfect

Help on Color: Color:

Bronze brown, Light brown, Dark reddish brown, Reddish brown.

Help on Density: Density:

3.72

Help on Diaphaneity: Diaphaneity:

Translucent

Help on Fracture: Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Help on Habit: Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Help on Habit: Habit:

Micaceous - Platy texture with "flexible" plates.

Help on Luminescence: Luminescence:

Non-fluorescent.

Help on Luster: Luster:

Vitreous - Pearly

Help on Streak: Streak:

brown

Optical Properties of Mcgovernite

Help on Gladstone-Dale: Gladstone-Dale:

CI meas= -0.015 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.048 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1911,KPDmeas= 0.2039,KC= 0.2008
Ncalc = 1.75 - 1.8

Help on Optical Data: Optical Data:

Uniaxial (+), w=1.757, e=1.76, bire=0.0030.

Calculated Properties of Mcgovernite

Help on Electron Density: Electron Density:

Bulk Density (Electron Density)=3.56 gm/cc
note: Specific Gravity of Mcgovernite =3.72 gm/cc.

Help on Fermion Index: Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Help on Photoelectric: Photoelectric:

PEMcgovernite = 20.77 barns/electron
U=PEMcgovernite x rElectron Density= 74.00 barns/cc.

Help on Radioactivity: Radioactivity:

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

Mcgovernite Classification

Help on Dana Class: Dana Class:

43.04.09.01 (43)Compound Phosphates, etc.

(43.04)(Anhydrous Compound Anions With Hydroxyl or Halogen)

(43.04.09)Mcgovernite Group

43.04.09.01 Mcgovernite Mn9Mg4Zn2As2Si2O17(OH)14 R 3c 3 2/m

43.04.09.02 Turtmannite! (Mn,Mg)25.5[(V,As)O4]3(SiO4)3[AsO3]xO5-5x(OH)20x R 3c 3 2/m

Help on Strunz Class: Strunz Class:

08.BE.45 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BE -With only medium-sized cations, (OH, etc.):RO4 > 2:1

08.BE.45 Dixenite CuMn14Fe(AsO3)5(SiO4)2(AsO4)(OH)6 R 3 3

08.BE.45 Hematolite (Mn,Mg,Al)15(AsO3)(AsO4)2(OH)23 R 3 3

08.BE.45 Kraisslite (Mn,Mg)24Zn3Fe(AsO3)2(AsO4)3(SiO4)6(OH)18 P 6322 6 2 2

08.BE.45 Mcgovernite Mn9Mg4Zn2As2Si2O17(OH)14 R 3c 3 2/m

08.BE.45 Turtmannite! (Mn,Mg)25.5[(V,As)O4]3(SiO4)3[AsO3]xO5-5x(OH)20x R 3c 3 2/m

08.BE.45 Arakiite! (Zn,Mn)(Mn,Mg)12(Fe,Al)2(AsO3)(AsO4)2(OH)23 Cc m

Other Mcgovernite Information

Help on References: References:

NAME( Ford32) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

Help on See Also: See Also:

Links to other databases for Mcgovernite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - Franklin Minerals(Palache)
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info

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Ask about Mcgovernite here :
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Print or Cut-and-Paste your Mcgovernite Specimen Label here :

Mcgovernite

Mn9Mg4Zn2As2Si2O17(OH)14
Dana No: 43.04.09.01 Strunz No: 08.BE.45
Locality:

Notes: