Gotzenite Mineral Data

Gotzenite Mineral Data +

General Gotzenite Information

Chemical Formula:

(Ca,Na)3(Ti,Al)Si2O7(F,OH)2

Composition:

Molecular Weight = 363.79 gm

Sodium 1.58 % Na 2.13 % Na₂O

Calcium 30.30 % Ca 42.39 % CaO

Titanium 9.87 % Ti 16.47 % TiO₂

Aluminum 1.85 % Al 3.50 % Al₂O₃

Silicon 15.44 % Si 33.03 % SiO₂

Hydrogen 0.14 % H 1.24 % H₂O

Oxygen 32.99 % O

Fluorine 7.83 % F 7.83 % F

- % F -3.30 % -O=F₂

______ ______

100.00 % 103.30 % = TOTAL OXIDE

Empirical Formula:

Ca_2.75Na_0.25Ti_0.75Al_0.25Si₂O₇F_1.5(OH)_0.5

Environment:

Alkalic igneous rocks.

IMA Status:

Valid Species (Pre-IMA) 1957

Locality:

Nyiragongo crater, Mount Shaheru, Kivu Province, Zaire. Link to MinDat.org Location Data.

Name Origin:

Named for Gustav Adolf Von Gotzen (1866-1910), German traveler and first European to climb Mt. Shaheru, North Kivu, Zaire.

Synonym:

Calcium rinkite

Goetzenite

Gotzenite Image

Images:

Gotzenite

Comments: Yellow-brown, thin crystals of g?tzenite in white feldspar matrix.
Location: Barkevik, Langesundsfjorden, Vestfold, Norway. Scale: 3.5x3x3 cm.
© John Betts - Fine Minerals

Gotzenite Crystallography

Axial Ratios:

a:b:c =1.3183:1:0.7841

Cell Dimensions:

a = 9.65, b = 7.32, c = 5.74, Z = 2; alpha = 90°, beta = 101.3°, gamma = 101.1° V = 390.16 Den(Calc)= 3.10

Crystal System:

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

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

By Intensity(I/I_o): 2.986(1), 3.1(1), 1.911(0.5),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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H - Help Screen
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Christiansen C C , Johnsen O , Makovicky E , The Canadian Mineralogist , 41 (2003) p.1203-1224, Crystal chemistry of the rosenbuschite group, Sample: WBC-13

View Additional jPOWD Structure files for Gotzenite
[1]

Physical Properties of Gotzenite

Cleavage:

[100] Perfect, [001] Good

Color:

Colorless, Very pale yellow, Tan, White.

Density:

3.138 - 3.2, Average = 3.16

Diaphaniety:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

5.5-6 - Knife Blade-Orthoclase

Luster:

Vitreous - Greasy

Streak:

white

Optical Properties of Gotzenite

Gladstone-Dale:

CI meas= 0.138 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.118 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.213,KPDmeas= 0.2084,KC= 0.2416

Optical Data:

Biaxial (+), a=1.651-1.662, b=1.653-1.665, g=1.659-1.672, bire=0.0080-0.0100, 2V(Calc)=62-68, 2V(Meas)=38-74. Dispersion r > v strong.

Pleochroism (x):

colorless.

Pleochroism (y):

pale yellow.

Pleochroism (z):

pale rose.

Calculated Properties of Gotzenite

Electron Density:

r_electron=3.06 gm/cc
note: r_Gotzenite=3.10 gm/cc.

Fermion Index

Fermion Index = 0.02054
Boson Index = 0.97946

Photoelectric:

PE_Gotzenite= 6.05 barns/electron
U=PE_Gotzenite x r_electron= 18.51 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Gotzenite is Not Radioactive

Gotzenite Classification

Dana Class:

56.2.5.4 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O

(56.2)with cations in [4] and/or >[4] coordination

(56.2.5)Mosandrite and related species

56.2.5.1 Mosandrite Na(Na,Ca)2(Ca,Ce,Y)4(Ti,Nb,Zr)(Si2O7)2(O,F)2F3 P 2₁ 2

56.2.5.2 Nacareniobsite-(Ce) NbNa3Ca3(Ce,La)(Si2O7)2OF3 P 2₁/a 2/m

56.2.5.3 Fersmanite Ca4(Na,Ca)4(Ti,Nb)4(Si2O7)2O8F3 C 2/c 2/m

56.2.5.4 Gotzenite (Ca,Na)3(Ti,Al)Si2O7(F,OH)2 P1 1

56.2.5.5 Rinkite! Na(Na,Ca)2(Ca,Ce)4(Ti,Nb)(Si2O7)2(O,F)2 P 2₁ 2

Strunz Class:

VIII/C.12-50 VIII - Silicates

VIII/C - Sorosilicates with [Si2O7]6-, with anions unfamiliar to tetraheders [O,OH,F]

VIII/C.12 - Götzenite - Nacareniobsite-(Ce) series

VIII/C.12-10 Mosandrite Na(Na,Ca)2(Ca,Ce,Y)4(Ti,Nb,Zr)(Si2O7)2(O,F)2F3 P 2₁ 2

VIII/C.12-20 Rinkite! Na(Na,Ca)2(Ca,Ce)4(Ti,Nb)(Si2O7)2(O,F)2 P 2₁ 2

VIII/C.12-30 Nacareniobsite-(Ce) NbNa3Ca3(Ce,La)(Si2O7)2OF3 P 2₁/a 2/m

VIII/C.12-40 Rosenbuschite (Ca,Na)3(Zr,Ti)Si2O8F P1 1

VIII/C.12-50 Gotzenite (Ca,Na)3(Ti,Al)Si2O7(F,OH)2 P1 1

VIII/C.12-55 Kochite! Na2(Na,Ca)4Ca4(Mn,Ca)2Zr2Ti2(Si2O7)4(O,F)4F4 P1 1

VIII/C.12-60 Hainite Na4Ca8(Ti,Zr,Mn,Fe)3Si8O28F8 P1 1

Other Gotzenite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

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Gotzenite

(Ca,Na)3(Ti,Al)Si2O7(F,OH)2
Dana No: 56.2.5.4 Strunz No: VIII/C.12-50
Locality:

Notes: