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Gageite Mineral Data

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General Gageite Information

Help on Chemical  Formula: Chemical Formula: (Mn,Mg,Zn)42Si16O54(OH)40
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Mn2+25.2Mg12.6Zn4.2Si16O54(OH)40
Help on Environment: Environment: Metamorphosed zinc-manganese deposit.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1911
Help on Locality: Locality: Franklin, Sussex Co., New Jersey, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Robert B. Gage, of Trenton, New Jersey, USA, who analyzed the first specimens.
Help on Name Pronunciation: Name Pronunciation: Gageite Say GAGEITE

Gageite Image

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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

Help on Axial Ratios: Axial Ratios: a:b:c =1.0071:1:0.6993
Help on Cell Dimensions: 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
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 6.87(1), 2.707(0.8), 2.758(0.8),

Physical Properties of Gageite

Help on Color: Color: Colorless, Pink.
Help on Density: Density: 3.41
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Gageite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.022 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.015 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2065,KPDmeas= 0.2144,KC= 0.2097
Ncalc = 1.72 - 1.74
Help on Optical Data: Optical Data: Biaxial (-), a=1.723, b=1.734, g=1.736, bire=0.0130

Calculated Properties of Gageite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.44 gm/cc
note: Specific Gravity of Gageite =3.54 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEGageite = 12.95 barns/electron
U=PEGageite x rElectron Density= 44.52 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Gageite is Not Radioactive

Gageite Classification

Help on  Dana Class: Dana Class: (65)Inosilicate Single-Width Unbranched Chains, W=1
  (65.03)with chains P=4
  (65.03.02)Gageite group Balangeroite (Mg,Fe,Fe,Mn)42Si16O54(OH)40 P 2/n 2/m Gageite-2M (Mn,Mg,Zn)42Si16O54(OH)40 P 2/n 2/m Gageite (Mn,Mg,Zn)42Si16O54(OH)40 P1 1
Help on  Strunz Class: 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 Information

Help on References: References: NAME( Ford32) PHYS. PROP.(Am.Min.,Vol.72,p382-391,1987) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Gageite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Franklin Minerals(Palache)
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info

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Dana No: Strunz No: 09.DH.35





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