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Ternesite Mineral Data

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General Ternesite Information

Help on Chemical  Formula: Chemical Formula: Ca5(SiO4)2SO4
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Ca5(SiO4)2(SO4)
Help on Environment: Environment: In calcium-rich xenoliths in leucite tephrite lava.
Help on IMA Status: IMA Status: Approved IMA 1997 (Dana # Added)
Help on Locality: Locality: The Ettringer Bellerberg, near Mayen, Eifel, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For Mr. B. Ternes of Mayen, Germany, who found the mineral and provided specimens for the study.
Help on Name Pronunciation: Name Pronunciation: Ternesite + Pronunciation Say TERNESITE
Help on Synonym: Synonym: ICSD 85123
  PDF 49-1807

Ternesite Image

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

Ternesite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.446:1:0.6616
Help on Cell Dimensions: Cell Dimensions: a = 6.863, b = 15.387, c = 10.181, Z = 4; V = 1,075.12 Den(Calc)= 2.97
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.83(1), 2.853(0.63), 2.565(0.55),

Physical Properties of Ternesite

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless, Bright blue.
Help on Density: Density: 2.94 - 2.98, Average = 2.96
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Hardness: Hardness: 4.5 - Between Fluorite and Apatite
Help on Luster: Luster: Vitreous (Glassy)

Optical Properties of Ternesite

Help on Gladstone-Dale: 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
Ncalc = 1.6 - 1.61
Help on Optical Data: Optical Data: Biaxial (-), a=1.63, b=1.637, g=1.64, bire=0.0100

Calculated Properties of Ternesite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.97 gm/cc
note: Specific Gravity of Ternesite =2.97 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0067129231
Boson Index = 0.9932870769
Help on Photoelectric: Photoelectric: PETernesite = 5.96 barns/electron
U=PETernesite x rElectron Density= 17.67 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ternesite is Not Radioactive

Ternesite Classification

Help on  Dana Class: Dana Class: (53)Nesosilicate Insular SiO4 Groups and Other Anions of Complex Cations
  (53.02)with (SO4), (CrO4), (PO4), etc.
  (53.02.04)Dana Group Ternesite! Ca5(SiO4)2SO4 P nma 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.AH.20 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AH -Nesosilicates with CO3, SO4, PO4, etc.
09.AH.20 Ternesite! Ca5(SiO4)2SO4 P nma 2/m 2/m 2/m

Other Ternesite Information

Help on References: References: NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.83,p655,1998) OPTIC PROP.(MinRec)
Help on See Also: See Also: Links to other databases for Ternesite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: Strunz No: 09.AH.20





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