Agrellite
A valid IMA mineral species
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About Agrellite
Formula:
NaCa2Si4O10F
Colour:
White to greyish or greenish white.
Lustre:
Pearly
Hardness:
5½
Specific Gravity:
2.902
Crystal System:
Triclinic
Name:
Named in honor of Stuart Olof Agrell (5 March 1913, Ruislip, Middlesex, UK â 29 January 1996), British mineralogist and meteoricist at Cambridge University. He was popular in the United Kingdom for his public television and radio appearances discussing the collection of lunar rocks and soils during the Apollo missions.
This page provides mineralogical data about Agrellite.
Unique Identifiers
IMA Classification of Agrellite
Approved
Approval year:
1973
First published:
1976
Classification of Agrellite
9.DH.75
9 : SILICATES (Germanates)
D : Inosilicates
H : Inosilicates with 4-periodic single chains, Si4O12
9 : SILICATES (Germanates)
D : Inosilicates
H : Inosilicates with 4-periodic single chains, Si4O12
70.1.1.4
70 : INOSILICATES Column or Tube Structures
1 : Column or Tube Structures with columnar silicate units
70 : INOSILICATES Column or Tube Structures
1 : Column or Tube Structures with columnar silicate units
17.1.3
17 : Silicates Containing other Anions
1 : Silicates with fluoride (not containing Al)
17 : Silicates Containing other Anions
1 : Silicates with fluoride (not containing Al)
Mineral Symbols
As of 2021 there are now IMAâCNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Are | IMAâCNMNC | Warr, L.N. (2021). IMAâCNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Agrellite
Pearly
Transparency:
Transparent, Translucent
Comment:
Pearly on cleavages.
Colour:
White to greyish or greenish white.
Streak:
White
Hardness:
5½ on Mohs scale
Cleavage:
Perfect
Excellent on {110} and {110}, poor on {010}
Excellent on {110} and {110}, poor on {010}
Density:
2.902 g/cm3 (Measured) 2.887 g/cm3 (Calculated)
Optical Data of Agrellite
Type:
Biaxial (-)
RI values:
nα = 1.567 nβ = 1.579 nγ = 1.581
2V:
Calculated: 47°
Max Birefringence:
δ = 0.014
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:
Low
Dispersion:
r > v strong
Chemistry of Agrellite
Mindat Formula:
NaCa2Si4O10F
Crystallography of Agrellite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 7.759(2) Å, b = 18.946(3) Å, c = 6.986(1) Å
α = 89.88(2)°, β = 116.65(2)°, γ = 94.32(2)°
α = 89.88(2)°, β = 116.65(2)°, γ = 94.32(2)°
Ratio:
a:b:c = 0.41 : 1 : 0.369
Unit Cell V:
914.67 Ă
Âł (Calculated from Unit Cell)
Z:
4
Morphology:
Crystals elongated k [001], to 10 cm; platy aggregates.
Crystal Structure
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2x2x2 | 3x3x3 | 4x4x4
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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) |
---|---|---|---|---|---|---|---|
0000722 | Agrellite | Ghose S, Wan C (1979) Agrellite, Na(Ca,RE)2Si4O10F: A layer structure with silicate tubes American Mineralogist 64 563-572 | 1979 | 0 | 293 | ||
0019049 | Agrellite | Rozhdestvenskaya I V, Nikishova L V (1998) Crystal structure of Na(Ca,Sr)2Si4O10F strontium agrellite from Yakutian charoitites: agrellite polytypes Crystallography Reports 43 589-597 | 1998 | Sirenevyi Kamen deposit, Murunskii massif, Yakutia, Russia | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
3.19 Ă | (vs) |
3.14 Ă | (vs) |
3.44 Ă | (s) |
3.33 Ă | (s) |
2.58 Ă | (s) |
2.31 Ă | (s) |
2.04 Ă | (ms) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 4b: Highly evolved igneous rocks | >3.0 |
35 : Ultra-alkali and agpaitic igneous rocks |
Type Occurrence of Agrellite
Place of Conservation of Type Material:
Canadian Museum of Nature, Ottawa;
University of Toronto, Toronto;
Royal Ontario Museum, Toronto, Canada, M34496;
Harvard University, Cambridge, Massachusetts, 117050; National Museum of Natural History, Washington, D.C., USA, 127007;
Cambridge Un
University of Toronto, Toronto;
Royal Ontario Museum, Toronto, Canada, M34496;
Harvard University, Cambridge, Massachusetts, 117050; National Museum of Natural History, Washington, D.C., USA, 127007;
Cambridge Un
Geological Setting of Type Material:
In pegmatite lenses and pods and in mafic gneisses in a regionally metamorphosed agpaitic alkalic rock complex
Associated Minerals at Type Locality:
Reference:
Gittins, J., Bown, M.G., Sturman, D. (1976) Agrellite, a new rock-forming mineral in regionally metamorphosed agpaitic alkalic rocks. The Canadian Mineralogist: 14: 120-126.
Synonyms of Agrellite
Other Language Names for Agrellite
Common Associates
Associated Minerals Based on Photo Data:
108 photos of Agrellite associated with Eudialyte | Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2 |
60 photos of Agrellite associated with Albite | Na(AlSi3O8) |
27 photos of Agrellite associated with Vlasovite | Na2ZrSi4O11 |
25 photos of Agrellite associated with Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
17 photos of Agrellite associated with Calcite | CaCO3 |
15 photos of Agrellite associated with Nepheline | Na3K(Al4Si4O16) |
12 photos of Agrellite associated with Gittinsite | CaZrSi2O7 |
12 photos of Agrellite associated with Thorite | Th(SiO4) |
9 photos of Agrellite associated with Fluorite | CaF2 |
8 photos of Agrellite associated with Aegirine | NaFe3+Si2O6 |
Related Minerals - Strunz-mindat Grouping
9.DH. | Gageite-2M | (Mn,Mg,Zn)42Si16O54(OH)40 |
9.DH. | Bavsiite | Ba2V2O2[Si4O12] |
9.DH. | Devilliersite | Ca4Ca2Fe3+10O4[(Fe3+10Si2)O36] |
9.DH. | Yuzuxiangite | Sr3Fe3+(Si2O6)2(OH) · 3H2O |
9.DH. | Louisfuchsite | Ca2(Mg4Ti2)(Al4Si2)O20 |
9.DH.05 | Leucophanite | NaCaBeSi2O6F |
9.DH.10 | Ohmilite | Sr3(Ti,Fe3+)(Si4O12)(O,OH) · 2-3H2O |
9.DH.15 | Haradaite | SrVSi2O7 |
9.DH.15 | Suzukiite | BaVSi2O7 |
9.DH.20 | Batisite | BaNaNaTi2(Si4O12)O2 |
9.DH.20 | Shcherbakovite | (K,Ba)KNa(Ti,Nb)2(Si4O12)O2 |
9.DH.20 | Noonkanbahite | BaKNaTi2(Si4O12)O2 |
9.DH.25 | Taikanite | Sr3BaMn2+2(Si4O12)O2 |
9.DH.30 | Krauskopfite | BaSi2O5 · 3H2O |
9.DH.35 | Balangeroite | (Mg,Fe2+,Fe3+,Mn2+)42Si16O54(OH)40 |
9.DH.35 | Gageite | Mn21(Si4O12)2O3(OH)20 |
9.DH.40 | Aenigmatite | Na4[Fe2+10Ti2]O4[Si12O36] |
9.DH.40 | Dorrite | Ca4(Mg3Fe3+9)O4(Si3Al8Fe3+O36) |
9.DH.40 | HĂžgtuvaite | Ca4[Fe2+6Fe3+6]O4[Si8Be2Al2O36] |
9.DH.40 | Krinovite | Na2Mg4Cr3+2(Si6O18)O2 |
9.DH.40 | Makarochkinite | (Ca,Na)4[Fe2+8Fe3+2Ti2]O4[Si8Be2Al2O36] |
9.DH.40 | Rhönite | Ca4[Mg8Fe3+2Ti2]O4[Si6Al6O36] |
9.DH.40 | Serendibite | Ca4[Mg6Al6]O4[Si6B3Al3O36] |
9.DH.40 | Welshite | Ca4Mg9Sb3O4[Si6Be3AlFe2O36] |
9.DH.40 | Wilkinsonite | Na2Fe2+4Fe3+2(Si6O18)O2 |
9.DH.40 | Leucorhönite | Ca2(Mg,Fe3+,Al)6(Si,Al)6O20 |
9.DH.40 | Kuratite | Ca2(Fe2+5Ti)O2[Si4Al2O18] |
9.DH.40 | Khesinite | Ca4(Mg3Fe3+9)O4(Fe3+9Si3)O36 |
9.DH.40 | UM1991-29-SiO:FeMgNa | Na4(Mg5Fe3+7)O4[Si9Fe3+3O36] |
9.DH.45 | Sapphirine | Mg4(Mg3Al9)O4[Si3Al9O36] |
9.DH.50 | Khmaralite | (Mg,Al,Fe)16[(Al,Si,Be)12O36]O4 |
9.DH.55 | Surinamite | (Mg,Fe)3Al4BeSi3O16 |
9.DH.55 | UM1988-26-SiO:AlMg | Mg4Al2O[Si3Al2O15] |
9.DH.60 | Deerite | (Fe,Mn)6(Fe,Al)3[Si6O17]O3(OH)5 |
9.DH.65 | Howieite | Na(Fe,Mn)10(Fe,Al)2Si12O31(OH)13 |
9.DH.65 | Taneyamalite | (Na,Ca)(Mn,Mg,Fe)12Si12(O,OH)44 |
9.DH.70 | Johninnesite | Na2Mn2+9Mg7(OH)8[AsO4]2[Si6O17]2 |
Fluorescence of Agrellite
Fluoresces bright pink under LW UV and duller pink under SW UV.
Other Information
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 Agrellite
mindat.org URL:
https://www.mindat.org/min-57.html
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References for Agrellite
Reference List:
Localities for Agrellite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
â - 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).
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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Canada (TL) | |
| Smithsonian Museum USNM NUMBER: 169743 +1 other reference |
China | |
| - (1978) +3 other references |
Russia | |
| [Lapis 1993:4 p.13-20] |
Konev et al. (1996) | |
Dokuchits et al. (2022) | |
Konev et al. (1996) | |
| Yakovenchuk et al. (2005) |
| Pakhomovsky et al. (2014) |
Tajikistan | |
| Agakhanov et al. (2008) |
USA | |
| Rocks and Minerals (1987) |
Rocks & Min.: 62: 190-193. |
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Kipawa alkaline complex, Les Lacs-du-Témiscamingue, Témiscamingue RCM, Abitibi-Témiscamingue, Québec, Canada