Ternesite Mineral Data

Ternesite Mineral Data +

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General Ternesite Information

Chemical Formula:

Ca5(SiO4)2SO4

Composition:

Molecular Weight = 480.62 gm

Calcium 41.69 % Ca 58.34 % CaO

Silicon 11.69 % Si 25.00 % SiO₂

Sulfur 6.67 % S 16.66 % SO₃

Oxygen 39.95 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₅(SiO₄)₂(SO₄)

Environment:

In calcium-rich xenoliths in leucite tephrite lava.

IMA Status:

Approved IMA 1997 (Dana # Added)

Locality:

The Ettringer Bellerberg, near Mayen, Eifel, Germany. Link to MinDat.org Location Data.

Name Origin:

For Mr. B. Ternes of Mayen, Germany, who found the mineral and provided specimens for the study.

Synonym:

ICSD 85123

IMA1995-015

PDF 49-1807

Ternesite Image

Images:

Ternesite

Comments: Pale blue crystalline ternesite.
Location: Bellerberg, Eifel, Rheinland-Pflaz, Germany. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Ternesite Crystallography

Axial Ratios:

a:b:c =0.446:1:0.6616

Cell Dimensions:

a = 6.863, b = 15.387, c = 10.181, Z = 4; V = 1,075.12 Den(Calc)= 2.97

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: P nma

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

By Intensity(I/I_o): 2.83(1), 2.853(0.63), 2.565(0.55),

Crystal Structure:

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Irran E , Tillmanns E , Hentschel G , Mineralogy and Petrology , 60 (1997) p.121-132, Ternesite, Ca5(SiO4)2SO4, a new mineral from the Ettringer Bellerberg/Eifel, Germany, Locality: Ettringer Bellerberg volcano, Eifel, Germany

Physical Properties of Ternesite

Cleavage:

None

Color:

Colorless, Bright blue.

Density:

2.94 - 2.98, Average = 2.96

Diaphaniety:

Transparent

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Vitreous (Glassy)

Optical Properties of Ternesite

Gladstone-Dale:

CI meas= -0.053 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.049 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.214,KPDmeas= 0.2148,KC= 0.204

Optical Data:

Biaxial (-), a=1.63, b=1.637, g=1.64, bire=0.0100

Calculated Properties of Ternesite

Electron Density:

r_electron=2.97 gm/cc
note: r_Ternesite=2.97 gm/cc.

Fermion Index

Fermion Index = 0.00671
Boson Index = 0.99329

Photoelectric:

PE_Ternesite= 5.96 barns/electron
U=PE_Ternesite x r_electron= 17.67 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ternesite is Not Radioactive

Ternesite Classification

Dana Class:

53.2.4.1 (53)Nesosilicate Insular SiO4 Groups and Other Anions of Complex Cations

(53.2)with (SO4), (CrO4), (PO4), etc.

(53.2.4)Dana Group

53.2.4.1 Ternesite ! Ca5(SiO4)2SO4 P nma 2/m 2/m 2/m

Strunz Class:

VIII/B.22-65 VIII - Silicates

VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, cationes with coordinationnumber between [8] and [12]

VIII/B.22 - Thaumasite series

VIII/B.22-10 Hatrurite Ca3SiO5 R 3m 3m

VIII/B.22-25 Poldervaartite (Ca,Mn)2SiO3(OH)2 P bca 2/m 2/m 2/m

VIII/B.22-30 Afwillite Ca3Si2O4(OH)6 P 2₁ 2

VIII/B.22-40 Bultfonteinite Ca2SiO2(OH,F)4 P1 1

VIII/B.22-50 Spurrite Ca5(SiO4)2(CO3) P 2₁/a 2/m

VIII/B.22-60 Paraspurrite Ca5(SiO4)2(CO3) P 2₁/a 2/m

VIII/B.22-65 Ternesite Ca5(SiO4)2SO4 P nma 2/m 2/m 2/m

VIII/B.22-70 Nagelschmidtite Ca7(SiO4)3(PO4)2 Unk Hex

VIII/B.22-75 Harrisonite! Ca(Fe,Mg)6(PO4)2(SiO4)2 R 3m 3 2/m

VIII/B.22-80 Fukalite Ca4Si2O6(CO3)(OH,F)2 Unk Ortho

VIII/B.22-90 Thaumasite Ca3Si(CO3)(SO4)(OH)6·12(H2O) P 6₃/m 6/m

VIII/B.22-100 Chelyabinskite* (Ca,Mg)3Si(OH)6(SO4,CO3)2·9(H2O) Unk Ortho

Other Ternesite Information

References:

NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.83,p655,1998) OPTIC PROP.(MinRec)

See Also:

Links to other databases for Ternesite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Ternesite

Ca5(SiO4)2SO4
Dana No: 53.2.4.1 Strunz No: VIII/B.22-65
Locality:

Notes: