Gageite-2M Mineral Data

Gageite-2M Mineral Data +

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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.

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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 - PrismaticH-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

Diaphaniety:

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

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:

r_electron=3.44 gm/cc
note: r_Gageite-2M=3.54 gm/cc.

Fermion Index

Fermion Index = 0.01606
Boson Index = 0.98394

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Gageite-2M is Not Radioactive

Gageite-2M Classification

Dana Class:

65.3.2.2a (65)Inosilicate Single-Width Unbranched Chains, W=1

(65.3)with chains P=4

(65.3.2)Gageite group

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

65.3.2.2a Gageite-2M (Mn,Mg,Zn)42Si16O54(OH)40 P 2/n 2/m

65.3.2.2b Gageite (Mn,Mg,Zn)42Si16O54(OH)40 P1 1

Strunz Class:

VIII/F.24-20 VIII - Silicates

VIII/F - Inosilicates (chain and band) Quadruplet chains [Si4O12]8-

VIII/F.24 - Balangeroite - Raite series

VIII/F.24-10 Balangeroite (Mg,Fe,Fe,Mn)42Si16O54(OH)40 P 2/n 2/m

VIII/F.24-12 Tiragalloite Mn4AsSi3O12(OH) P 2₁/n 2/m

VIII/F.24-20* Gageite (Mn,Mg,Zn)42Si16O54(OH)40 P1 1

VIII/F.24-20 Gageite-2M (Mn,Mg,Zn)42Si16O54(OH)40 P 2/n 2/m

VIII/F.24-30 Raite Na3Mn3Ti0.25Si8O20(OH)2·10(H2O) C 2/m 2/m

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 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Print or Cut-and-Paste your Gageite-2M Specimen Label here :

Gageite-2M

(Mn,Mg,Zn)42Si16O54(OH)40
Dana No: 65.3.2.2a Strunz No: VIII/F.24-20
Locality:

Notes: