Amblygonite Mineral Data

Amblygonite Mineral Data +

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General Amblygonite Information

Chemical Formula:

(Li,Na)Al(PO4)(F,OH)

Composition:

Molecular Weight = 151.41 gm

Sodium 3.80 % Na 5.12 % Na₂O

Lithium 3.44 % Li 7.40 % Li₂O

Aluminum 17.82 % Al 33.67 % Al₂O₃

Phosphorus 20.46 % P 46.88 % P₂O₅

Hydrogen 0.17 % H 1.49 % H₂O

Oxygen 44.91 % O

Fluorine 9.41 % F 9.41 % F

- % F -3.96 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Li_0.75Na_0.25Al(PO₄)F_0.75(OH)_0.25

IMA Status:

Valid Species (Pre-IMA) 1817

Locality:

Link to MinDat.org Location Data.

Name Origin:

From the Greek amblys - "blunt" and goni - "angle."

Synonym:

ICSD 26513

PDF 22-1138

Amblygonite Image

Images:

Amblygonite

Comments: Grayish, massive amblygonite from the type locality.
Location: Chursdorf, Penig, Chemnitz, Saxony, Germany. Scale: Specimen size 35 mm.
© Thomas Witzke / Abraxas-Verlag

Amblygonite Crystallography

Axial Ratios:

a:b:c =0.7289:1:0.7078

Cell Dimensions:

a = 5.19, b = 7.12, c = 5.04, Z = 2; alpha = 112.033°, beta = 97.816°, gamma = 68.116° V = 158.71 Den(Calc)= 3.17

Crystal System:

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

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

By Intensity(I/I_o): 2.925(1), 3.151(1), 4.64(1),

Forms:

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Forms: [ 3 3 2] [ 0 1 1] [ 0 1 0] [ 0 2 1] [ 1 1 0] [ 1 0 0] [ 0 0 1]

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Crystal Structure:

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Groat L A , Raudsepp M , Hawthorne F C , Ercit T S , Sherriff B L , Hartman J S , American Mineralogist , 75 (1990) p.992-1008, The amblygonite-montebrasite series: Characterization by single-crystal, structure refinement, infrared spectroscopy and multinuclear MAS-NMR, spectroscopy, sample AF-65

View Additional jPOWD Structure files for Amblygonite
[1] [2] [3] [4] [5]

Physical Properties of Amblygonite

Cleavage:

[100] Perfect, [110] Good, [011] Distinct

Color:

White, Yellow, Gray, Bluish gray, Greenish gray.

Density:

2.98 - 3.11, Average = 3.04

Diaphaniety:

Transparent to Subtransparent to translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Columnar - Forms columns

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

5.5-6 - Knife Blade-Orthoclase

Luminescence:

None.

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Amblygonite

Gladstone-Dale:

CI meas= -0.004 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.036 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1903,KPDmeas= 0.1981,KC= 0.1974

Optical Data:

Biaxial (-), a=1.58-1.6, b=1.59-1.62, g=1.6-1.63, bire=0.0200-0.0300, 2V(Calc)=68-88, 2V(Meas)=50.

Calculated Properties of Amblygonite

Electron Density:

r_electron=2.98 gm/cc
note: r_Amblygonite=3.05 gm/cc.

Fermion Index

Fermion Index = 0.00279
Boson Index = 0.99721

Photoelectric:

PE_Amblygonite= 1.64 barns/electron
U=PE_Amblygonite x r_electron= 4.87 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Amblygonite is Not Radioactive

Amblygonite Classification

Dana Class:

41.5.8.1 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.5)where (A B)2 (XO4) Zq

(41.5.8)Dana Group

41.5.8.1 Amblygonite (Li,Na)Al(PO4)(F,OH) P1 1

41.5.8.2 Montebrasite LiAl(PO4)(OH,F) P1 1

41.5.8.3 Natromontebrasite (Na,Li)Al(PO4)(OH,F) P1 1

Strunz Class:

VII/B.02-30 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O,OH, cations of medium size: Mg, Mn, Fe, Cu, Zn, Pseudomalachite group and related compounds

VII/B.02 - Amblygonite group, Griphite - Tavorite

VII/B.02-10 Griphite Ca(Mn,Na,Li)6FeAl2(PO4)6(F,OH)2 P a3 2/m 3

VII/B.02-20 Tancoite HNa2LiAl(PO4)2(OH) Pbcb 2/m 2/m 2/m

VII/B.02-30 Amblygonite (Li,Na)Al(PO4)(F,OH) P1 1

VII/B.02-40 Montebrasite LiAl(PO4)(OH,F) P1 1

VII/B.02-50 Natromontebrasite (Na,Li)Al(PO4)(OH,F) P1 1

VII/B.02-60 Tavorite LiFe(PO4)(OH) P1 or P1 Tri

Other Amblygonite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Mason68)

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Amblygonite

(Li,Na)Al(PO4)(F,OH)
Dana No: 41.5.8.1 Strunz No: VII/B.02-30
Locality:

Notes: