Gageite-2M Mineral Data

General Gageite-2M Information

Chemical Formula:

(Mn,Mg,Zn)42Si16O54(OH)40

Composition:

Molecular Weight = 3,958.95 gm

Magnesium 7.74 % Mg 12.83 % MgO

Manganese 34.97 % Mn 45.15 % MnO

Zinc 6.94 % Zn 8.63 % ZnO

Silicon 11.35 % Si 24.28 % SiO₂

Hydrogen 1.02 % H 9.10 % H₂O

Oxygen 37.99 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺_25.2Mg_12.6Zn_4.2Si₁₆O₅₄(OH)₄₀

IMA Status:

Valid Species (Pre-IMA) 1911

Locality:

Link to MinDat.org Location Data.

Name Origin:

Named for Robert B. Gage, of Trenton, New Jersey, USA, who analyzed the first specimens.

Name Pronunciation:

Gageite-2M

Gageite-2M Crystallography

Axial Ratios:

a:b:c =1:1:0.5066

Cell Dimensions:

a = 19.42, b = 19.42, c = 9.84, Z = 2; beta = 89.5° V = 3,710.88 Den(Calc)= 3.54

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2/n

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

By Intensity(I/I_o): 6.87(1), 2.707(0.8), 2.758(0.8),

Physical Properties of Gageite-2M

Color:

Colorless, Pink.

Density:

3.58

Diaphaneity:

Transparent

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Optical Properties of Gageite-2M

Gladstone-Dale:

CI meas= 0.032 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.021 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2053,KPDmeas= 0.203,KC= 0.2097
Ncalc = 1.74 - 1.75

Optical Data:

Biaxial (-), a=1.72, b=1.73, g=1.73, bire=0.0100, 2V(Calc)=0, 2V(Meas)=20-50. Dispersion relatively strong.

Calculated Properties of Gageite-2M

Electron Density:

Bulk Density (Electron Density)=3.44 gm/cc
note: Specific Gravity of Gageite-2M =3.54 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Gageite-2M= 12.95 barns/electron
U=PE_Gageite-2M x rElectron Density= 44.52 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Gageite-2M is Not Radioactive

Gageite-2M Classification

Dana Class:

65.03.02.02a (65)Inosilicate Single-Width Unbranched Chains, W=1

(65.03)with chains P=4

(65.03.02)Gageite group

65.03.02.01 Balangeroite (Mg,Fe,Fe,Mn)42Si16O54(OH)40 P 2/n 2/m

65.03.02.02a Gageite-2M (Mn,Mg,Zn)42Si16O54(OH)40 P 2/n 2/m

65.03.02.02b Gageite (Mn,Mg,Zn)42Si16O54(OH)40 P1 1

Strunz Class:

09.DH.35 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DH -Inosilicates with 4-periodic single chains, Si4O12

09.DH.35 Balangeroite (Mg,Fe,Fe,Mn)42Si16O54(OH)40 P 2/n 2/m

09.DH.35 Gageite-2M (Mn,Mg,Zn)42Si16O54(OH)40 P 2/n 2/m

09.DH.35 Gageite (Mn,Mg,Zn)42Si16O54(OH)40 P1 1

Other Gageite-2M Information

References:

PHYS. PROP.(Am.Min.,Vol.72,p382-391,1987) OPTIC PROP.(Dana)

See Also:

Links to other databases for Gageite-2M :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info

Search for Gageite-2M using:

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

Visit our Advertisers for Gageite-2M :

Ask about Gageite-2M 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 Gageite-2M Specimen Label here :

Gageite-2M

(Mn,Mg,Zn)42Si16O54(OH)40
Dana No: 65.03.02.02a Strunz No: 09.DH.35
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.