Gageite Mineral Data

Gageite Mineral Data +

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General Gageite 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

Environment:

Metamorphosed zinc-manganese deposit.

IMA Status:

Valid Species (Pre-IMA) 1911

Locality:

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

Name Origin:

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

Gageite Image

Images:

Gageite

Comments: Preserved sprays of inesite completely replaced by tan-colored gageite crystals.
Location: N'Chwaning Mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Scale: 5 x 4.6 cm.
© John Veevaert

Gageite Crystallography

Axial Ratios:

a:b:c =1.0071:1:0.6993

Cell Dimensions:

a = 14.17, b = 14.07, c = 9.84, Z = 1; alpha = 76.5°, beta = 76.6°, gamma = 86.9° V = 1,852.97 Den(Calc)= 3.55

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

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

Crystal Structure:

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Moore P B , American Mineralogist , 54 (1969) p.1005-1017, A novel octahedral framework structure: Gageite

Physical Properties of Gageite

Color:

Colorless, Pink.

Density:

3.41

Diaphaniety:

Transparent

Habit:

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

Habit:

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

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Gageite

Gladstone-Dale:

CI meas= -0.022 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.018 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2059,KPDmeas= 0.2144,KC= 0.2097

Optical Data:

Biaxial (-), a=1.723, b=1.734, g=1.736, bire=0.0130

Calculated Properties of Gageite

Electron Density:

r_electron=3.45 gm/cc
note: r_Gageite=3.55 gm/cc.

Fermion Index

Fermion Index = 0.01606
Boson Index = 0.98394

Photoelectric:

PE_Gageite= 12.95 barns/electron
U=PE_Gageite x r_electron= 44.65 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Gageite is Not Radioactive

Gageite Classification

Dana Class:

65.3.2.2b (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 Information

References:

NAME( Ford32) PHYS. PROP.(Am.Min.,Vol.72,p382-391,1987) OPTIC PROP.(Ford32)

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Gageite

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

Notes: