Trimerite
A valid IMA mineral species - grandfathered
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About Trimerite
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).
Unique Identifiers
Mindat ID:
4018
Long-form identifier:
mindat:1:1:4018:7
IMA Classification of Trimerite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
CaBe3Mn2+2(SiO4)3
First published:
1891
Classification of Trimerite
9.AB.05
9 : SILICATES (Germanates)
A : Nesosilicates
B : Nesosilicates without additional anions; cations in [4] and greater coordination
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]
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
14 : Silicates not Containing Aluminum
3 : Silicates of Be
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Tme | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Trimerite
Vitreous
Transparency:
Transparent
Colour:
Colourless, pink, orange-red, yellow-red
Streak:
White
Hardness:
6 - 7 on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
Distinct on {001}
Distinct on {001}
Fracture:
Conchoidal
Density:
3.474 g/cm3 (Measured) 3.47 g/cm3 (Calculated)
Optical Data of Trimerite
Type:
Biaxial (-)
RI values:
nα = 1.715 nβ = 1.72 nγ = 1.725
2V:
Measured: 83° , Calculated: 88°
Max. Birefringence:
δ = 0.010
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
Surface Relief:
Moderate
Dispersion:
r > v
Optical Extinction:
X perpendicular to {001}.
Chemistry of Trimerite
Mindat Formula:
CaMn2+2Be3(SiO4)3
Element Weights:
Common Impurities:
Fe,Mg
Crystallography of Trimerite
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°
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 (110); in basal section, twin lamellae in three directions intersect at a 120 degree angle.
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0010789 | Trimerite | Klaska K H, Jarchow O (1977) Die Bestimmung der kristallstruktur von trimerit CaMn2(BeSiO4)3 und das trimeritgesetz der verzwillingung Zeitschrift fur Kristallographie 145 46-65 |  | 1977 | Langban, Varmland, Sweden | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.764 Å | (100) |
| 3.56 Å | (40) |
| 2.229 Å | (35) |
| 2.332 Å | (30) |
| 1.420 Å | (30) |
| 2.053 Å | (25) |
| 1.784 Å | (25) |
Reference:
Comments:
From ICDD 17-477 for type locality material.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-? alteration and/or metamorphism | |
| 32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits |
Type Occurrence of Trimerite
Place of Conservation of Type Material:
Muséum Nationale d’Histoire Naturelle, Paris, France, number 120371 (type).
Swedish Museum of Natural History, Stockholm, Sweden, number 531847 (holotype).
Swedish Museum of Natural History, Stockholm, Sweden, number 531847 (holotype).
Geological Setting of Type Material:
In a magnetite-pyroxene-garnet skarn probably formed during late-stage hydrothermal activity.
Associated Minerals at Type Locality:
Other Language Names for Trimerite
Common Associates
Associations Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 9.AB.10 | Larsenite | PbZnSiO4 |
| 9.AB.15 | Esperite | PbCa2Zn3(SiO4)3 |
| 9.AB.20 | Rondorfite | Ca8Mg(SiO4)4Cl2 |
Fluorescence of Trimerite
Yellow in LW-UV (365nm) and SW-UV (254nm).
Other Information
Notes:
Gelatinizes in HCl.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Trimerite
mindat.org URL:
https://www.mindat.org/min-4018.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Trimerite
Reference List:
Flink, G. (1891) Ueber Pinakiolith und Trimerit, zwei neue Mineralien aus den Mangangruben Schwedens. Zeitschrift für Krystallographie, 18 (1). 361-376 doi:10.1524/zkri.1891.18.1.361
Brögger, W. C. (1891) Ueber die morphotropischen Beziehungen des Pinakiolith und des Trimerit zu verwandten Mineralien. Zeitschrift für Krystallographie, 18 (1). 377-385 doi:10.1524/zkri.1891.18.1.377
Aminoff, G. (1926) Zur Kristallographie des Trimerits. Geologiska Föreningen i Stockholm Förhandlingar, 48 (1) 19-43 doi:10.1080/11035892609445636
Klaska, K. H., Jarchow, O. (1977) Die Bestimmung der Kristallstruktur von Trimerit CaMn2(BeSiO4)3 und das Trimeritgesetz der Verzwillingung. Zeitschrift für Kristallographie, 145 (1). 46-65 doi:10.1524/zkri.1977.145.1-2.46
Localities for Trimerite
Showing 6 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Norway | |
| Husdal et al. (2019) |
Sweden | |
| Gatedal (n.d.) +1 other reference |
| Gustafsson (2003) | |
| Flink (1916) +3 other references |
| Nysten (1984) +1 other reference |
USA | |
| Bernard et al. (2004) |
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Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden