Gonyerite Mineral Data

Gonyerite Mineral Data +

General Gonyerite Information

Chemical Formula:

Mn++3[Mn++3Fe+++][(Si,Fe+++)4O10](OH,O)8

Composition:

Molecular Weight = 703.49 gm

Magnesium 10.36 % Mg 17.19 % MgO

Manganese 23.43 % Mn 30.25 % MnO

Iron 9.53 % Fe 13.62 % Fe₂O₃

Silicon 15.17 % Si 32.46 % SiO₂

Hydrogen 0.57 % H 5.12 % H₂O

Oxygen 40.94 % O

______ ______

100.00 % 98.64 % = TOTAL OXIDE

Empirical Formula:

Mg₃Mn²⁺₃Fe³⁺Si_3.8Fe³⁺_0.2O₁₄(OH)₄

Environment:

Veinlets in Mn-rich skarns.

IMA Status:

Valid Species (Pre-IMA) 1955

Locality:

Langban, Varmland, Sweden. Link to MinDat.org Location Data.

Name Origin:

Named for Forest A. Gonyer (1899-1971), chemist-analyst and mineralogist, Harvard University.

Gonyerite Image

Images:

Gonyerite

Comments: Brown massive gonyerite in manganese ore.
Location: Harstigen, Varmland, Sweden. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Gonyerite Crystallography

Axial Ratios:

a:b:c =0.5782:1:3.0443

Cell Dimensions:

a = 5.47, b = 9.46, c = 28.8, Z = 4; V = 1,490.29 Den(Calc)= 3.14

Crystal System:

OrthorhombicSpace Group: pseudo-HEX

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

By Intensity(I/I_o): 7.23(1), 3.61(0.8), 4.79(0.5),

Physical Properties of Gonyerite

Cleavage:

[001] Perfect

Color:

Dark brown, Brownish black, Bright green.

Density:

3.01

Diaphaniety:

Transparent to Translucent

Fracture:

Flexible - Flexible fragments.

Habit:

Platy - Sheet forms (e.g. micas).

Habit:

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

Hardness:

2.5 - Finger Nail

Luster:

Pearly

Streak:

chocolate brown

Optical Properties of Gonyerite

Gladstone-Dale:

CI meas= 0.014 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.055 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2096,KPDmeas= 0.2186,KC= 0.2218

Optical Data:

Biaxial (-), a=1.646, b=1.664, g=1.664, bire=0.0180, 2V(Calc)=0, 2V(Meas)=0.

Pleochroism (x):

dark brown.

Pleochroism (y):

light brown.

Pleochroism (z):

light brown.

Calculated Properties of Gonyerite

Electron Density:

r_electron=2.94 gm/cc
note: r_Gonyerite=3.01 gm/cc.

Fermion Index

Fermion Index = 0.01966
Boson Index = 0.98034

Photoelectric:

PE_Gonyerite= 9.61 barns/electron
U=PE_Gonyerite x r_electron= 28.24 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Gonyerite is Not Radioactive

Gonyerite Classification

Dana Class:

71.4.4.1 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.4)interlayered 1:1, 2:1, and octahedra

(71.4.4)Dana Group

71.4.4.1 Gonyerite Mn3[Mn3Fe][(Si,Fe)4O10](OH,O)8 pseudo-HEX Ortho

Strunz Class:

VIII/H.23-80 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica like with [Si4O10]4- and related groups

VIII/H.23 - Chlorite group

VIII/H.23-10 Sudoite Mg2(Al,Fe)3Si3AlO10(OH)8 C 2/m 2/m

VIII/H.23-20 Clinochlore (Mg,Fe)5Al(Si3Al)O10(OH)8 C 2/m 2/m

VIII/H.23-30 Chamosite (Fe,Mg,Fe)5Al(Si3Al)O10(OH,O)8 C 2/m 2/m

VIII/H.23-40 Orthochamosite (Fe,Mg,Fe)5Al(Si3Al)O10(OH,O)8 C3m-pseudoHEX Ortho

VIII/H.23-50 Baileychlore (Zn,Al,[])3[Fe2Al][Si3AlO10](OH)8 C1,C1 Tri

VIII/H.23-60 Pennantite Mn5Al(Si3Al)O10(OH)8 C 2/m 2/m

VIII/H.23-70 Nimite (Ni,Mg,Fe)5Al(Si3Al)O10(OH)8 C 2/m 2/m

VIII/H.23-80 Gonyerite Mn3[Mn3Fe][(Si,Fe)4O10](OH,O)8 pseudo-HEX Ortho

VIII/H.23-90 Cookeite LiAl4(Si3Al)O10(OH)8 P 2₁/a 2/m

VIII/H.23-95 Borocookeite! Li(13x)Al(4-x)(BSi3)O10(OH,F)8[x=0-0.33] pseudo C 2/m 2/m

VIII/H.23-100 Manandonite Li2Al4[(Si2AlB)O10](OH)8 C1 1

VIII/H.23-110 Franklinfurnaceite Ca2(Fe,Al)MnMn3Zn2Si2O10(OH)8 C 2 2

Other Gonyerite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Gonyerite

Mn++3[Mn++3Fe+++][(Si,Fe+++)4O10](OH,O)8
Dana No: 71.4.4.1 Strunz No: VIII/H.23-80
Locality:

Notes: