Mineralogy Database

Trimerite Mineral Data

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General Trimerite Information

Help on Chemical  Formula: Chemical Formula: CaMn2Be3(SiO4)3
Help on Composition: Composition: Molecular Weight = 453.24 gm
   Calcium     8.84 %  Ca   12.37 % CaO
   Manganese  24.24 %  Mn   31.30 % MnO
   Beryllium   5.97 %  Be   16.56 % BeO
   Silicon    18.59 %  Si   39.77 % SiO2
   Oxygen     42.36 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CaMn2+2Be3(SiO4)3
Help on Environment: Environment: A rare mineral, probably formed during late-stage hydrothermal activity associated with contact metamorphism and metasomatism.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1890
Help on Locality: Locality: At the Harstigen mine, near Persberg, at Jakobsberg, Sweden. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek for three parts, in allusion to the trilling twinning and associated optical effects.
Help on Name Pronunciation: Name Pronunciation: Trimerite + Pronunciation Say TRIMERITE
Help on Synonym: Synonym: ICSD 100082
  PDF 17-477

Trimerite Image

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Comments: Pinkish crystalline trimerite in ore.
Location: Langban, Varmland, Sweden. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Trimerite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.1522:1:3.664
Help on Cell Dimensions: Cell Dimensions: a = 16.4, b = 7.62, c = 27.92, Z = 16; beta = 90.15° V = 3,489.09 Den(Calc)= 3.45
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.764(1), 3.56(0.4), 2.229(0.35),

Physical Properties of Trimerite

Help on Cleavage: Cleavage: {001} Good
Help on Color: Color: Colorless, Yellowish red, Pink.
Help on Density: Density: 3.474
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Pseudo Hexagonal - Crystals show a hexagonal outline.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 6-7 - Orthoclase-Quartz
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Trimerite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.014 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.007 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2087,KPDmeas= 0.2073,KC= 0.2101
Ncalc = 1.72 - 1.73
Help on Optical Data: Optical Data: Biaxial (-), a=1.715, b=1.72, g=1.725, bire=0.0100, 2V(Calc)=88, 2V(Meas)=83.

Calculated Properties of Trimerite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.35 gm/cc
note: Specific Gravity of Trimerite =3.45 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.06
Boson Index = 0.94
Help on Photoelectric: Photoelectric: PETrimerite = 8.06 barns/electron
U=PETrimerite x rElectron Density= 26.98 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Trimerite is Not Radioactive

Trimerite Classification

Help on  Dana Class: Dana Class: (51)Nesosilicate Insular SiO4 Groups Only
  (51.02)with cations in [4] as well as >[4]
  (51.02.01)Trimerite group Trimerite CaMn2Be3(SiO4)3 P 21/c 2/m Larsenite PbZnSiO4 Pnam 2/m 2/m 2/m Esperite PbCa3Zn4(SiO4)4 B21/m 2/m
Help on  Strunz Class: Strunz Class: 09.AB.05 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AB -Nesosilicates without additional anions;
09.AB.05 Trimerite CaMn2Be3(SiO4)3 P 21/c 2/m

Other Trimerite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Trimerite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 09.AB.05





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