Mcgovernite Mineral Data

Mcgovernite Mineral Data +

[Current Minerals] [Order Status] [Policies] [e-Bay Items]
B & L Minerals, Fine Mineral specimens for sale for collectors of all levels

General Mcgovernite Information

Chemical Formula:

Mn9Mg4Zn2As2Si2O17(OH)14

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

Empirical Formula:

Mn²⁺₉Mg₄Zn₂As₂Si₂O₁₇(OH)₁₄

Environment:

Metamorphosed zinc-manganese deposit.

IMA Status:

Valid Species (Pre-IMA) 1927

Locality:

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

Name Origin:

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

Mcgovernite Image

Images:

Mcgovernite

Comments: Golden sub-metallic micaceous mcgovernite with black franklinite, red willemite, and white calcite.
Location: Franklin, Sussex County, New Jersey, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Mcgovernite Crystallography

Axial Ratios:

a:c = 1:25

Cell Dimensions:

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

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/I_o): 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

Cleavage:

[001] Perfect

Color:

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

Density:

3.72

Diaphaniety:

Translucent

Fracture:

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

Habit:

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

Habit:

Micaceous - Platy texture with "flexible" plates.

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Pearly

Streak:

brown

Optical Properties of Mcgovernite

Gladstone-Dale:

CI meas= -0.016 (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

Optical Data:

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

Calculated Properties of Mcgovernite

Electron Density:

r_electron=3.56 gm/cc
note: r_Mcgovernite=3.72 gm/cc.

Fermion Index

Fermion Index = 0.01247
Boson Index = 0.98753

Photoelectric:

PE_Mcgovernite= 20.77 barns/electron
U=PE_Mcgovernite x r_electron= 74.00 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Mcgovernite is Not Radioactive

Mcgovernite Classification

Dana Class:

43.4.9.1 (43)Compound Phosphates, etc.

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

(43.4.9)Dana Group

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

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

Strunz Class:

VIII/B.11-20 VIII - Silicates

VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, cations of octahedral and tetrahedral orientation [4/6]

VIII/B.11 - Dixenite - Kraisslite series

VIII/B.11-10 Dixenite CuMn14Fe(AsO3)5(SiO4)2(AsO4)(OH)6 R 3 3

VIII/B.11-15 Turtmannite! (Mn,Mg)25.5[(V,As)O4]3(SiO4)3[AsO3]xO5-5x(OH)20x R 3c 3 2/m

VIII/B.11-20 Mcgovernite Mn9Mg4Zn2As2Si2O17(OH)14 R 3c 3 2/m

VIII/B.11-30 Kraisslite (Mn,Mg)24Zn3Fe(AsO3)2(AsO4)3(SiO4)6(OH)18 P 6₃22 6 2 2

VIII/B.11-40 Asbecasite Ca3(Ti,Sn)As6Si2Be2O20 P 3c 3m

Other Mcgovernite Information

References:

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

Search for Mcgovernite using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Mcgovernite :
AA Mineral Specimens
B and L Minerals
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Minernet.it
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Mcgovernite Mineral Data :

Ask about Mcgovernite 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 Mcgovernite Specimen Label here :

Mcgovernite

Mn9Mg4Zn2As2Si2O17(OH)14
Dana No: 43.4.9.1 Strunz No: VIII/B.11-20
Locality:

Notes: