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Gotzenite Mineral Data

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General Gotzenite Information

Help on Chemical  Formula: Chemical Formula: (Ca,Na)3(Ti,Al)Si2O7(F,OH)2
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Ca2.75Na0.25Ti0.75Al0.25Si2O7F1.5(OH)0.5
Help on Environment: Environment: Alkalic igneous rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1957
Help on Locality: Locality: Nyiragongo crater, Mount Shaheru, Kivu Province, Zaire. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Gustav Adolf Von Gotzen (1866-1910), German traveler and first European to climb Mt. Shaheru, North Kivu, Zaire.
Help on Name Pronunciation: Name Pronunciation: Gotzenite + Pronunciation Say GOTZENITE
Help on Synonym: Synonym: Calcium rinkite

Gotzenite Image

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

Gotzenite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.3183:1:0.7841
Help on Cell Dimensions: 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
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): 2.986(1), 3.1(1), 1.911(0.5),

Physical Properties of Gotzenite

Help on Cleavage: Cleavage: {100} Perfect, {001} Good
Help on Color: Color: Colorless, Very pale yellow, Tan, White.
Help on Density: Density: 3.138 - 3.2, Average = 3.16
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 5.5-6 - Knife Blade-Orthoclase
Help on Luster: Luster: Vitreous - Greasy
Help on Streak: Streak: white

Optical Properties of Gotzenite

Help on Optical Data: 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.
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): pale yellow.
Help on Pleochroism (z): Pleochroism (z): pale rose.

Calculated Properties of Gotzenite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.06 gm/cc
note: Specific Gravity of Gotzenite =3.10 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEGotzenite = 6.05 barns/electron
U=PEGotzenite x rElectron Density= 18.51 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Gotzenite is Not Radioactive

Gotzenite Classification

Help on  Dana Class: Dana Class: (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O
  (56.02)with cations in [4] and/or >[4] coordination
  (56.02.05)Mosandrite and related species Mosandrite Na(Na,Ca)2(Ca,Ce,Y)4(Ti,Nb,Zr)(Si2O7)2(O,F)2F3 P 21 2 Nacareniobsite-(Ce) NbNa3Ca3(Ce,La)(Si2O7)2OF3 P 21/a 2/m Fersmanite Ca4(Na,Ca)4(Ti,Nb)4(Si2O7)2O8F3 C 2/c 2/m Gotzenite (Ca,Na)3(Ti,Al)Si2O7(F,OH)2 P1 1 Rinkite! Na(Na,Ca)2(Ca,Ce)4(Ti,Nb)(Si2O7)2(O,F)2 P 21 2 IMA2008-024! (Ca,Na,REE,[])7(Nb,Ti)[Si2O7]2OF3 Cc m Dovyrenite! Ca6Zr[Si2O7]2(OH)4 Pnnm 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.BE.22 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BE -Si2O7 groups with additional anions;
09.BE.22 Hainite Na4Ca8(Ti,Zr,Mn,Fe)3Si8O28F8 P1 1
09.BE.22 Gotzenite (Ca,Na)3(Ti,Al)Si2O7(F,OH)2 P1 1
09.BE.22 Rosenbuschite (Ca,Na)3(Zr,Ti)Si2O8F P1 1
09.BE.22 Kochite! Na2(Na,Ca)4Ca4(Mn,Ca)2Zr2Ti2(Si2O7)4(O,F)4F4 P1 1

Other Gotzenite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Gotzenite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - EUROmin Project
6 - Ecole des Mines de Paris
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info

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Dana No: Strunz No: 09.BE.22





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