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.

Name Pronunciation:

Agrellite + Pronunciation

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

Diaphaneity:

Translucent

Habit:

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

Hardness:

5.5 - Knife Blade

Luminescence:

Fluorescent, Short UV=pink magenta, Long UV=bright pink.

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
Ncalc = 1.58 - 1.59

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:

Bulk Density (Electron Density)=2.84 gm/cc
note: Specific Gravity of Agrellite =2.86 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Agrellite= 3.71 barns/electron
U=PE_Agrellite x rElectron Density= 10.54 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Agrellite is Not Radioactive

Agrellite Classification

Dana Class:

70.01.01.04 (70)Inosilicate Column or Tube Structures

(70.01)with columnar silicate units

(70.01.01)Litidionite group

70.01.01.01 Litidionite KNaCuSi4O10 P1 1

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

70.01.01.03 Manaksite KNaMnSi4O10 P1 1

70.01.01.04 Agrellite NaCa2Si4O10F P1 1

Strunz Class:

09.DH.75 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DH -Inosilicates with 4-periodic single chains, Si4O12

09.DH.75 Agrellite NaCa2Si4O10F P1 1

Other Agrellite Information

References:

NAME( Dana8) PHYS. PROP.(Collectors Book of Fluorescent Minerals) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Agrellite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
13 - WWW-MINCRYST

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Print or Cut-and-Paste your Agrellite Specimen Label here :

Agrellite

NaCa2Si4O10F
Dana No: 70.01.01.04 Strunz No: 09.DH.75
Locality:

Notes: