Tinzenite Mineral Data

Tinzenite Mineral Data +

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General Tinzenite Information

Chemical Formula:

(Ca,Mn,Fe)3Al2BO3Si4O12(OH)

Composition:

Molecular Weight = 572.45 gm

Calcium 12.60 % Ca 17.63 % CaO

Manganese 8.64 % Mn 11.15 % MnO

Aluminum 9.43 % Al 17.81 % Al₂O₃

Iron 2.93 % Fe 3.77 % FeO

Silicon 19.62 % Si 41.98 % SiO₂

Boron 1.89 % B 6.08 % B₂O₃

Hydrogen 0.18 % H 1.57 % H₂O

Oxygen 44.72 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca_1.8Mn²⁺_0.9Fe²⁺_0.3Al₂(BO₃)Si₄O₁₂(OH)

Environment:

Quartz veins in manganese deposits.

IMA Status:

Valid Species (Pre-IMA) 1923

Locality:

Tinzen, Val d'Err, Grisons, Switzerland Link to MinDat.org Location Data.

Name Origin:

Named after its locality.

Synonym:

ICSD 85086

PDF 6-444

Severginite

Tinzenite Image

Images:

Tinzenite

Comments: Orange crystalline tinzenite with quartz and black braunite.
Location: Cassagne mine, near Chiavari, Liguria, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Tinzenite

Comments: Orange bladed aggregate of tinzenite crystals and clear quartz.
Location: Molinello mine, Val Graveglia, Italy. Scale: 5.8x3.6x3.3 cm.
© Richard Dale / Dale Minerals

Tinzenite Crystallography

Axial Ratios:

a:b:c =0.9796:1:0.7791

Cell Dimensions:

a = 8.988, b = 9.175, c = 7.149, Z = 2; alpha = 102.9°, beta = 98.1°, gamma = 88° V = 568.58 Den(Calc)= 3.34

Crystal System:

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

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

By Intensity(I/I_o): 2.812(1), 3.46(0.8), 6.3(0.7),

Forms:

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Forms: [ 1 1 1] [ 1 1 1] [ 1 0 0] [ 1 1 0] [ 2 0 1] [ 1 1 0]

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Crystal Structure:

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Belokoneva E L , Goryunova A N , Pletnev P A , Spiridonov E M , Crystallography Reports , 46 (2001) p.30-32, Crystal structure of high-manganese tinzenite from the Falotta deposit, in Switzerland, Locality: Falotta deposit, Switzerland

Physical Properties of Tinzenite

Cleavage:

[???] Good, [???] Good

Color:

Yellow, Orange red.

Density:

3.29

Diaphaniety:

Translucent to subtranslucent

Habit:

Columnar - Forms columns

Hardness:

6.5-7 - Pyrite-Quartz

Luster:

Vitreous (Glassy)

Optical Properties of Tinzenite

Gladstone-Dale:

CI meas= -0.019 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.003 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2094,KPDmeas= 0.2126,KC= 0.2087

Optical Data:

Biaxial (-), a=1.693, b=1.701, g=1.704, bire=0.0110, 2V(Calc)=62, 2V(Meas)=62.

Calculated Properties of Tinzenite

Electron Density:

r_electron=3.29 gm/cc
note: r_Tinzenite=3.34 gm/cc.

Fermion Index

Fermion Index = 0.01392
Boson Index = 0.98608

Photoelectric:

PE_Tinzenite= 5.65 barns/electron
U=PE_Tinzenite x r_electron= 18.60 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Tinzenite is Not Radioactive

Tinzenite Classification

Dana Class:

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

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

(56.2.2)Axinite group

56.2.2.1 Ferroaxinite Ca2FeAl2BO3Si4O12(OH) P1 1

56.2.2.2 Magnesio-axinite Ca2MgAl2BO3Si4O12(OH) P1 1

56.2.2.3 Manganaxinite Ca2MnAl2BO3Si4O12(OH) P1 1

56.2.2.4 Tinzenite (Ca,Mn,Fe)3Al2BO3Si4O12(OH) P1 1

Strunz Class:

VIII/E.06-40 VIII - Silicates

VIII/E - Cyklosilicates, quadruplet rings [Si4O11]8-

VIII/E.06 - Axinite group, Magnesio-axinite - Ashburtonite series

VIII/E.06-10 Magnesio-axinite Ca2MgAl2BO3Si4O12(OH) P1 1

VIII/E.06-20 Ferroaxinite Ca2FeAl2BO3Si4O12(OH) P1 1

VIII/E.06-30 Manganaxinite Ca2MnAl2BO3Si4O12(OH) P1 1

VIII/E.06-40 Tinzenite (Ca,Mn,Fe)3Al2BO3Si4O12(OH) P1 1

VIII/E.06-50 Papagoite CaCuAlSi2O6(OH)3 C 2/m 2/m

VIII/E.06-60 Ashburtonite HPb4Cu4Si4O12(HCO3)4(OH)4Cl I 4/m 4/m

Other Tinzenite Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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Tinzenite

(Ca,Mn,Fe)3Al2BO3Si4O12(OH)
Dana No: 56.2.2.4 Strunz No: VIII/E.06-40
Locality:

Notes: