Agrellite Mineral Data

Agrellite Mineral Data +

General Agrellite Information

Chemical Formula:

NaCa2Si4O10F

Composition:

Molecular Weight = 394.48 gm

Sodium 5.83 % Na 7.86 % Na₂O

Calcium 20.32 % Ca 28.43 % CaO

Silicon 28.48 % Si 60.93 % SiO₂

Oxygen 40.56 % O

Fluorine 4.82 % F 4.82 % F

- % F -2.03 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NaCa₂(Si₄O₁₀)F

Environment:

Alkalic igneous rocks of the Sheffield Lake complex.

IMA Status:

Approved IMA 1976

Locality:

Kipawa River, Villieu Township, Temiscaming County, Quebec, Canada. Link to MinDat.org Location Data.

Name Origin:

Named for Stuart O. Agrell, British mineralogist, Cambridge University.

Synonym:

ICSD 100376

IMA1973-032

PDF 41-1441

Agrellite Image

Images:

Agrellite Eudialyte

Comments: Tan agrellite grain, with red eudialyte.
Location: Kipiwa Complex, Villedieu, Quebec, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Agrellite Crystallography

Axial Ratios:

a:b:c =0.4095:1:0.3687

Cell Dimensions:

a = 7.759, b = 18.946, c = 6.986, Z = 4; alpha = 89.88°, beta = 116.65°, gamma = 94.32° V = 915.25 Den(Calc)= 2.86

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 3.842(1), 3.203(0.84), 9.44(0.8),

Crystal Structure:

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Ghose S , Wan C , American Mineralogist , 64 (1979) p.563-572, Agrellite, Na(Ca,RE)2Si4O10F: A layer structure with silicate tubes

Physical Properties of Agrellite

Cleavage:

[110] Perfect, [110] Perfect, [010] Poor

Color:

White, Grayish white, Greenish white.

Density:

2.88 - 2.9, Average = 2.88

Diaphaniety:

Translucent

Habit:

Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape.

Hardness:

5.5 - Knife Blade

Luminescence:

Fluorescent.

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Agrellite

Gladstone-Dale:

CI meas= 0.022 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.011 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2013,KPDmeas= 0.1992,KC= 0.2036

Optical Data:

Biaxial (-), a=1.567, b=1.579, g=1.581, bire=0.0140

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

colorless.

Calculated Properties of Agrellite

Electron Density:

r_electron=2.84 gm/cc
note: r_Agrellite=2.86 gm/cc.

Fermion Index

Fermion Index = 0.01376
Boson Index = 0.98624

Photoelectric:

PE_Agrellite= 3.71 barns/electron
U=PE_Agrellite x r_electron= 10.54 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Agrellite is Not Radioactive

Agrellite Classification

Dana Class:

70.1.1.4 (70)Inosilicate Column or Tube Structures

(70.1)with columnar silicate units

(70.1.1)Dana Group

70.1.1.1 Litidionite KNaCuSi4O10 P1 1

70.1.1.2 Fenaksite (K,Na,Ca)4(Fe,Fe,Mn)2Si8O20(OH,F) P1 1

70.1.1.3 Manaksite KNaMnSi4O10 P1 1

70.1.1.4 Agrellite NaCa2Si4O10F P1 1

Strunz Class:

VIII/H.15-10 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica like layered silicates with [Si4O10]4- and related groups

VIII/H.15 - Agrellite - Mountainite series

VIII/H.15-10 Agrellite NaCa2Si4O10F P1 1

VIII/H.15-20 Glagolevite! NaMg6[Si3AlO10](OH,O)8·H2O C1 1

VIII/H.15-30 Mountainite (Ca,Na2,K2)2Si4O10·3(H2O) P 2₁/a,P 2₁/c,P 2₁/n 2/m

Other Agrellite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

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Agrellite

NaCa2Si4O10F
Dana No: 70.1.1.4 Strunz No: VIII/H.15-10
Locality:

Notes: