Trimerite Mineral Data

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General Trimerite Information

Chemical Formula:

CaMn2Be3(SiO4)3

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

Empirical Formula:

CaMn²⁺₂Be₃(SiO₄)₃

Environment:

A rare mineral, probably formed during late-stage hydrothermal activity associated with contact metamorphism and metasomatism.

IMA Status:

Valid Species (Pre-IMA) 1890

Locality:

At the Harstigen mine, near Persberg, at Jakobsberg, Sweden. Link to MinDat.org Location Data.

Name Origin:

From the Greek for three parts, in allusion to the trilling twinning and associated optical effects.

Name Pronunciation:

Trimerite + Pronunciation

Synonym:

ICSD 100082

PDF 17-477

Trimerite Image

Images:

Trimerite

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

Trimerite Crystallography

Axial Ratios:

a:b:c =2.1522:1:3.664

Cell Dimensions:

a = 16.4, b = 7.62, c = 27.92, Z = 16; beta = 90.15° V = 3,489.09 Den(Calc)= 3.45

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

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

By Intensity(I/I_o): 2.764(1), 3.56(0.4), 2.229(0.35),

Crystal Structure:

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Klaska K H , Jarchow O , Zeitschrift fur Kristallographie , 145 (1977) p.46-65, Die Bestimmung der kristallstruktur von trimerit CaMn2(BeSiO4)3, und das trimeritgesetz der verzwillingung, Locality: Langban, Varmland, Sweden

Physical Properties of Trimerite

Cleavage:

{001} Good

Color:

Colorless, Yellowish red, Pink.

Density:

3.474

Diaphaneity:

Transparent to translucent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Pseudo Hexagonal - Crystals show a hexagonal outline.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

6-7 - Orthoclase-Quartz

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Trimerite

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

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

Electron Density:

Bulk Density (Electron Density)=3.35 gm/cc
note: Specific Gravity of Trimerite =3.45 gm/cc.

Fermion Index:

Fermion Index = 0.06
Boson Index = 0.94

Photoelectric:

PE_Trimerite= 8.06 barns/electron
U=PE_Trimerite x rElectron Density= 26.98 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Trimerite is Not Radioactive

Trimerite Classification

Dana Class:

51.02.01.01 (51)Nesosilicate Insular SiO4 Groups Only

(51.02)with cations in [4] as well as >[4]

(51.02.01)Trimerite group

51.02.01.01 Trimerite CaMn2Be3(SiO4)3 P 2₁/c 2/m

51.02.01.02 Larsenite PbZnSiO4 Pnam 2/m 2/m 2/m

51.02.01.03 Esperite PbCa3Zn4(SiO4)4 B21/m 2/m

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

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Trimerite Specimen Label here :

Trimerite

CaMn2Be3(SiO4)3
Dana No: 51.02.01.01 Strunz No: 09.AB.05
Locality:

Notes: