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
GUID
(UUID V4):
(UUID V4):
1c3273cd-bbd0-4c62-bdc8-4c4d2b54db93
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 |
|---|---|---|
| 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 = 1.720 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.
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r > v
Optical Extinction:
X perpendicular to {001}.
Chemistry of Trimerite
Mindat Formula:
CaMn2+2Be3(SiO4)3
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
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
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Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
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CIF File Best | x | y | z | a | b | c
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Rotation
Stop | Start
Stop | Start
Labels
Console Off | On | Grey | Yellow
Console Off | On | Grey | Yellow
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) |
Comments:
From ICDD 17-477 for type locality material.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-𝑇 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:
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 Trimerite
Common Associates
Associated Minerals 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
Localities for Trimerite
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 | |
| Kjell Gatedal collection and ... +1 other reference |
| Gustafsson (2003) | |
| Flink (1917) +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