Jerrygibbsite Mineral Data

Jerrygibbsite Mineral Data +

General Jerrygibbsite Information

Chemical Formula:

(Mn,Zn)9(SiO4)4(OH)2

Composition:

Molecular Weight = 902.02 gm

Manganese 51.77 % Mn 66.85 % MnO

Zinc 3.62 % Zn 4.51 % ZnO

Silicon 12.45 % Si 26.64 % SiO₂

Hydrogen 0.22 % H 2.00 % H₂O

Oxygen 31.93 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺_8.5Zn_0.5(SiO₄)₄(OH)₂

Environment:

Metamorphosed Zn-Mn deposit. Dimorphous with sonolite.

IMA Status:

Approved IMA 1984

Locality:

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

Name Origin:

Named for Gerald V. Gibbs (1929-), Virginia Polytechnic Institute, Blacksburg, Virginia, USA.

Synonym:

ICSD 67041

PDF 38-352

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Jerrygibbsite Crystallography

Axial Ratios:

a:b:c =0.4532:1:2.6327

Cell Dimensions:

a = 4.85, b = 10.7, c = 28.17, Z = 4; V = 1,461.88 Den(Calc)= 4.10

Crystal System:

Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: Pbn21

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

By Intensity(I/I_o): 1.806(1), 2.557(1), 2.869(0.78),

Physical Properties of Jerrygibbsite

Cleavage:

[001] Imperfect

Color:

Violet pink.

Density:

Diaphaniety:

Transparent to Translucent

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Hardness:

5.5 - Knife Blade

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

light pink

Optical Properties of Jerrygibbsite

Gladstone-Dale:

CI meas= 0.028 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.052 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1906,KPDmeas= 0.1953,KC= 0.201

Optical Data:

Biaxial (-), a=1.772, b=1.783, g=1.789, bire=0.0170, 2V(Calc)=72, 2V(Meas)=72. Dispersion r > v moderate.

Pleochroism (x):

none.

Pleochroism (y):

none.

Pleochroism (z):

none.

Calculated Properties of Jerrygibbsite

Electron Density:

r_electron=3.81 gm/cc
note: r_{Jerrygibbsite}=4.00 gm/cc.

Fermion Index

Fermion Index = 0.00745
Boson Index = 0.99255

Photoelectric:

PE_{Jerrygibbsite}= 15.73 barns/electron
U=PE_{Jerrygibbsite} x r_electron= 59.93 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Jerrygibbsite is Not Radioactive

Jerrygibbsite Classification

Dana Class:

52.3.2d.2 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O

(52.3)with cations in [6] coordination only

(52.3.2d)Humite group (Clinohumite series)

52.3.2d.1 Clinohumite (Mg,Fe)9(SiO4)4(F,OH)2 P 2₁/c 2/m

52.3.2d.2 Jerrygibbsite (Mn,Zn)9(SiO4)4(OH)2 Pbn21 mm2

52.3.2d.3 Sonolite Mn9(SiO4)4(OH,F)2 P 2₁/a 2/m

52.3.2d.4 Hydroxylclinohumite! Mg9(SiO4)4(OH,F)2 P 2₁/c 2/m

Strunz Class:

VIII/B.04-100 VIII - Silicates

VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, cations of octahedral and tetrahedral orientation [4/6]

VIII/B.04 - Humite group

VIII/B.04-10 Norbergite Mg3(SiO4)(F,OH)2 P nma 2/m 2/m 2/m

VIII/B.04-20 Chondrodite (Mg,Fe)5(SiO4)2(F,OH)2 P 2₁/c 2/m

VIII/B.04-30 Humite (Mg,Fe)7(SiO4)3(F,OH)2 P nma 2/m 2/m 2/m

VIII/B.04-40 Clinohumite (Mg,Fe)9(SiO4)4(F,OH)2 P 2₁/c 2/m

VIII/B.04-42 Hydroxylclinohumite! Mg9(SiO4)4(OH,F)2 P 2₁/c 2/m

VIII/B.04-50 Ribbeite (Mn,Mg)5(SiO4)2(OH)2 P nma 2/m 2/m 2/m

VIII/B.04-60 Alleghanyite Mn5(SiO4)2(OH)2 P 2₁/a 2/m

VIII/B.04-70 Reinhardbraunsite Ca5(SiO4)2(OH,F)2 P 2₁/a 2/m

VIII/B.04-80 Manganhumite (Mn,Mg)7(SiO4)3(OH)2 Pbnm 2/m 2/m 2/m

VIII/B.04-90 Leucophoenicite Mn7(SiO4)3(OH)2 P 2₁/a 2/m

VIII/B.04-100 Jerrygibbsite (Mn,Zn)9(SiO4)4(OH)2 Pbn21 mm2

VIII/B.04-110 Sonolite Mn9(SiO4)4(OH,F)2 P 2₁/a 2/m

Other Jerrygibbsite Information

References:

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

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Print or Cut-and-Paste your Jerrygibbsite Specimen Label here :

Jerrygibbsite

(Mn,Zn)9(SiO4)4(OH)2
Dana No: 52.3.2d.2 Strunz No: VIII/B.04-100
Locality:

Notes: