Tuperssuatsiaite Mineral Data

Tuperssuatsiaite Mineral Data +

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General Tuperssuatsiaite Information

Chemical Formula:

Na(Fe+++,Mn)3[Si8O20](OH)2·n(H2O)

Composition:

Molecular Weight = 818.31 gm

Sodium 5.34 % Na 7.20 % Na₂O

Titanium 1.17 % Ti 1.95 % TiO₂

Manganese 3.36 % Mn 4.33 % MnO

Iron 15.01 % Fe 21.47 % Fe₂O₃

Silicon 27.46 % Si 58.74 % SiO₂

Hydrogen 0.74 % H 6.60 % H₂O

Oxygen 46.92 % O

______ ______

100.00 % 100.29 % = TOTAL OXIDE

Empirical Formula:

Na_1.9Fe³⁺_2.2Mn²⁺_0.5Ti_0.2Si₈O₂₀(OH)₂·2(H₂O)

Environment:

A late-stage, low-temperature, hydrothermal mineral in veins cutting nepheline syenite and in sodalite-nepheline syenite pegmatite.

IMA Status:

Approved IMA 1984

Locality:

Tuperssuatsiait Bay, Greenland. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Tuperssuatsiaite Image

Images:

Click Here for Larger Tuperssuatsiaite Image

Tuperssuatsiaite Aluminoferrotschermakite

Comments: Golden acicular tuperssuatsiaite crystal spray with clear apophyllite and dark green aluminoferrotschermigite.
Location: Aris Quarry, Khomas, Namibia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Tuperssuatsiaite

Comments: Rich, brown tufts up to 0,4 cm of acicular tuperssuatsiaite crystals on a phonolite matrix.
Location: Aris Phonolite, Namibia. Scale: Picture size 4 cm.
© Minernet

Images:

Tuperssuatsiaite

Comments: Two mm golden acicular sprays of tuperssuatsiaite on matrix.
Location: Aris Quarry, Windhoek, Namibia. Scale: Picture size 5 mm.
© Tom Loomis / Dakota Matrix

Tuperssuatsiaite Crystallography

Axial Ratios:

a:b:c =0.7866:1:0.2951

Cell Dimensions:

a = 14.034, b = 17.841, c = 5.265, Z = 2; beta = 103.67° V = 1,280.91 Den(Calc)= 2.12

Crystal System:

MonoclinicSpace Group: C 2/m

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

By Intensity(I/I_o): 10.82(1), 2.638(0.4), 2.235(0.3),2.51(0.3), 2.544(0.3), 3.395(0.3), 4.14(0.2),

Physical Properties of Tuperssuatsiaite

Cleavage:

[100] Good

Color:

Reddish brown.

Density:

2.465

Diaphaniety:

Transparent

Fracture:

Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).

Luster:

Vitreous (Glassy)

Streak:

brownish yellow

Optical Properties of Tuperssuatsiaite

Gladstone-Dale:

CI meas= 0.056 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.097 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2657,KPDmeas= 0.2285,KC= 0.2421

Optical Data:

Biaxial (+), a=1.54, b=1.56, g=1.58-1.6, bire=0.0400-0.0600, 2V(Calc)=74-88, 2V(Meas)=103.5-103..

Pleochroism (x):

colorless or colorless.

Pleochroism (y):

colorless or light reddish brown.

Pleochroism (z):

pale yellowish brown or dark reddish brown.

Calculated Properties of Tuperssuatsiaite

Electron Density:

r_electron=2.44 gm/cc
note: r_{Tuperssuatsiaite}=2.47 gm/cc.

Fermion Index

Fermion Index = 0.01774
Boson Index = 0.98226

Photoelectric:

PE_{Tuperssuatsiaite}= 6.61 barns/electron
U=PE_{Tuperssuatsiaite} x r_electron= 16.12 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Tuperssuatsiaite is Not Radioactive

Tuperssuatsiaite Classification

Dana Class:

74.3.1a.2 (74)Phyllosilicate Modulated Layers

(74.3)with joined strips

(74.3.1a)Palygorskite-sepiolite group (Palygorskite subgroup)

74.3.1a.1 Palygorskite (Mg,Al)2Si4O10(OH)·4(H2O) C 2/m 2/m

74.3.1a.2 Tuperssuatsiaite Na(Fe,Mn)3[Si8O20](OH)2·n(H2O) C 2/m Mono

74.3.1a.3 Yofortierite (Mn,Mg)5Si8O20(OH)2·8-9(H2O) Pn(?) m

74.3.1a.4 Kalifersite! (K,Na)5Fe7Si20O50(OH)6·12(H2O) P1 1

Strunz Class:

VIII/H.33-10 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica minerals with other simple layers, [Si6O15]6- and others

VIII/H.33 - Tuperssuatsiaite - Loughlinite series

VIII/H.33-10 Tuperssuatsiaite Na(Fe,Mn)3[Si8O20](OH)2·n(H2O) C 2/m Mono

VIII/H.33-20 Palygorskite (Mg,Al)2Si4O10(OH)·4(H2O) C 2/m 2/m

VIII/H.33-30 Yofortierite (Mn,Mg)5Si8O20(OH)2·8-9(H2O) Pn(?) m

VIII/H.33-40 Sepiolite Mg4Si6O15(OH)2·6(H2O) Pnan 2/m 2/m 2/m

VIII/H.33-50 Falcondoite (Ni,Mg)4Si6O15(OH)2·6(H2O) Pncn 2/m 2/m 2/m

VIII/H.33-60 Loughlinite Na2Mg3Si6O16·8(H2O) Unk Ortho

VIII/H.33-80 Intersilite! Na6MnTi[Si10O24(OH)](OH)3·4(H2O) I2/m 2/m

VIII/H.33-90 Kalifersite! (K,Na)5Fe7Si20O50(OH)6·12(H2O) P1 1

Other Tuperssuatsiaite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(AmMin, Vol 87, p 1458) OPTIC PROP.(AntBidBlaNic2)

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Tuperssuatsiaite

Na(Fe+++,Mn)3[Si8O20](OH)2·n(H2O)
Dana No: 74.3.1a.2 Strunz No: VIII/H.33-10
Locality:

Notes: