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Trimerite

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About TrimeriteHide

Formula:
CaMn2+2Be3(SiO4)3
Colour:
Colourless, pink, orange-red, yellow-red
Lustre:
Vitreous
Hardness:
6 - 7
Specific Gravity:
3.474
Crystal System:
Monoclinic
Name:
Named in 1890 by Flink from the Greek τριμεής, "three parted" in allusion to the optically observable radial segments (due to trilling-forming twinning).
Structurally closely related to beryllonite.


Classification of TrimeriteHide

Approved, 'Grandfathered' (first described prior to 1959)
9.AB.05

9 : SILICATES (Germanates)
A : Nesosilicates
B : Nesosilicates without additional anions; cations in [4] and greater coordination
Dana 7th ed.:
51.2.1.1
51.2.1.1

51 : NESOSILICATES Insular SiO4 Groups Only
2 : Insular SiO4 Groups Only with cations in [4] as well as >[4]
14.3.17

14 : Silicates not Containing Aluminum
3 : Silicates of Be

Physical Properties of TrimeriteHide

Vitreous
Transparency:
Transparent
Colour:
Colourless, pink, orange-red, yellow-red
Hardness:
6 - 7 on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
Distinct on {001}
Fracture:
Conchoidal
Density:
3.474 g/cm3 (Measured)    3.47 g/cm3 (Calculated)

Optical Data of TrimeriteHide

Type:
Biaxial (-)
RI values:
nα = 1.715 nβ = 1.720 nγ = 1.725
2V:
Measured: 83° , Calculated: 88°
Max Birefringence:
δ = 0.010
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r > v
Comments:
X perpendicular to {001}

Chemical Properties of TrimeriteHide

Formula:
CaMn2+2Be3(SiO4)3
IMA Formula:
CaBe3Mn2+2(SiO4)3
Common Impurities:
Fe,Mg

Crystallography of TrimeriteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Cell Parameters:
a = 8.09 Å, b = 7.61 Å, c = 14.06 Å
β = 90°
Ratio:
a:b:c = 1.063 : 1 : 1.848
Unit Cell V:
865.60 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Crystals prismatic, pseudohexagonal by twinning to 12 mm; as crystal intergrowths
Twinning:
Triple twins with composition planes (110) and (1_10); in basal section, twin lamellae in three directions intersect at a 120 degree angle

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.764 (100)
3.56 (40)
2.229 (35)
2.332 (30)
1.420 (30)
2.053 (25)
1.784 (25)
Comments:
From ICDD 17-477 for type locality material

Type Occurrence of TrimeriteHide

Geological Setting of Type Material:
In a magnetite-pyroxene-garnet skarn probably formed during late-stage hydrothermal activity
Associated Minerals at Type Locality:
Reference:
Flink, G. (1891) Ueber Pinakiolith und Trimerit, zwei neue Mineralien aus den Mangangruben Schwedens. Zeitschrift für Kristallographie 18: 361-376.

Other Language Names for TrimeriteHide

German:Trimerit
Spanish:Trimerita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Hematite4 photos of Trimerite associated with Hematite on mindat.org.
Andradite1 photo of Trimerite associated with Andradite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.AB.10LarsenitePbZnSiO4Orth. mm2 : Pna21
9.AB.15EsperitePbCa2Zn3(SiO4)3Mon. 2/m : P21/b
9.AB.20RondorfiteCa8Mg(SiO4)4Cl2Iso. m3 (2/m 3)

Related Minerals - Dana Grouping (8th Ed.)Hide

51.2.1.2LarsenitePbZnSiO4Orth. mm2 : Pna21
51.2.1.3EsperitePbCa2Zn3(SiO4)3Mon. 2/m : P21/b

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.3.1PhenakiteBe2SiO4Trig. 3 : R3
14.3.2BertranditeBe4(Si2O7)(OH)2Orth. mm2 : Cmc21
14.3.3BerylliteBe3(SiO4)(OH)2 · H2OOrth.
14.3.4LiberiteLi2BeSiO4Mon. m : Pm
14.3.5ChkaloviteNa2BeSi2O6Orth. mm2 : Fdd2
14.3.6EudidymiteNa2Be2Si6O15 · H2OMon. 2/m : B2/b
14.3.7EpididymiteNa2Be2Si6O15 · H2OOrth. mmm (2/m 2/m 2/m) : Pnma
14.3.8GugiaiteCa2Be(Si2O7)Tet.
14.3.9Jeffreyite(Ca,Na)2(Be,Al)(Si2O7,HSi2O7)Orth.
14.3.10Semenovite-(Ce)Na8Ca2FeBe6Ce2Si14O40(OH)4F4Orth. mmm (2/m 2/m 2/m)
14.3.11BaryliteBe2Ba(Si2O7)Orth.
14.3.12Hingganite-(Ce)(Ce,REE)2(□,Fe2+)Be2[SiO4]2(OH)2Mon. 2/m : P21/b
14.3.13Hingganite-(Yb)(Yb,Y,REE)2□Be2[SiO4]2(OH)2
14.3.14Hingganite-(Y)(Y,REE,Ca)2(□,Fe2+)Be2[SiO4]2(OH)2Mon. 2/m : P21/b
14.3.15Minasgeraisite-(Y)CaBe2Y2Si2O10Mon. 2/m : P21/b
14.3.16SørenseniteNa4SnBe2Si6O16(OH)4Mon. 2/m : B2/b
14.3.18ChiavenniteCaMnBe2Si5O13(OH)2 · 2H2OMon. 2/m : P21/b
14.3.19Tvedalite(Ca,Mn)4Be3Si6O17(OH)4 · 3H2OOrth.
14.3.20HarstigiteCa6(Mn,Mg)Be4Si6(O,OH)24Orth.
14.3.21SverigeiteNaMnMgSnBe2(SiO4)3(OH)Orth. mmm (2/m 2/m 2/m) : Imma
14.3.22Joesmithite{Pb}{Ca2}{Mg3Fe3+2}(Be2Si6O22)(OH)2Mon.
14.3.23Gadolinite-(Y)Y2Fe2+Be2Si2O10Mon. 2/m : P21/b
14.3.24Gadolinite-(Ce)(Ce,La,Nd,Y)2Fe2+Be2Si2O10Mon. 2/m
14.3.25Calciogadolinite-(Y)(YCa)2Fe3+Be2[SiO4]2O2

Fluorescence of TrimeriteHide

Yellow in LW-UV (365nm) and SW-UV (254nm)

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for TrimeriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Flink, G. (1891) Ueber Pinakiolith und Trimerit, zwei neue Mineralien aus den Mangangruben Schwedens. Zeitschrift für Kristallographie 18: 361-376.
Aminoff, G. (1926) Zur kristallographie des trimerits. Ein beitrag zur kenntnis der pseudosymmetrie. Geologiska Föreningens i Stockholm Förhandlingar 48: 19-43
Foshag, W. F. (1927) New mineral names. American Mineralogist 12: 379-382
Henderson, C. M. B., Taylor, D. (1984) Thermal expansion behaviour of beryllonite [Na(BePO4)] and trimerite [CaMn(BeSiO4)3]. Mineralogical Magazine 48: 431-436
Klaska, K. H., Jarchow, O. (1977) Die Bestimmung der kristallstruktur von trimerit CaMn2(BeSiO4)3. Zeitschrift für Kristallographie 145: 46-65

Internet Links for TrimeriteHide

Localities for TrimeriteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Sweden
 
  • Värmland
    • Filipstad
Nysten, P., Holtstam, D. and Jonsson, E. (1999) The Långban minerals. In Långban - The mines,their minerals, geology and explorers (D. Holtstam and J. Langhof, eds.), Swedish Museum of Natural History and Raster Förlag, Stockholm & Chr. Weise Verlag, Munich, pp. 89-183. ; K:Gatedal
      • Nordmark district
        • Jakobsberg ore field
Nysten,P. & Gustafsson, L.(2006): I jakt på sällsynta mineral. Geologiskt forum nr 49, 22-25; AKMG 6, nr. 21, 46
      • Persberg district
        • Pajsberg
Hey's Mineral Index (1993)/ Nysten, P. (1984): Kleinod des Nordens - Harstigen in Schweden. Magma 2/1984, 12-30.
USA
 
  • North Carolina
    • Alleghany Co.
      • Sparta
        • Bald Knob
Jan H.Bernard and Jaroslav Hyrsl,2004, Minerals and their Localities,pg # 694
Mineral and/or Locality  
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