Ameghinite Mineral Data

Ameghinite Mineral Data +

General Ameghinite Information

Chemical Formula:

NaB3O3(OH)4

Composition:

Molecular Weight = 171.45 gm

Sodium 13.41 % Na 18.08 % Na₂O

Boron 18.92 % B 60.91 % B₂O₃

Hydrogen 2.35 % H 21.02 % H₂O

Oxygen 65.32 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NaB₃O₃(OH)₄

IMA Status:

Approved IMA 1967

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 4219

PDF 20-1081

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Ameghinite Crystallography

Axial Ratios:

a:b:c =1.8648:1:0.6401

Cell Dimensions:

a = 18.428, b = 9.882, c = 6.326, Z = 8; beta = 104.387° V = 1,115.87 Den(Calc)= 2.04

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c

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

By Intensity(I/I_o): 3.065(1), 3.147(0.76), 2.548(0.29),

Crystal Structure:

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Dal Negro A , Pozas J M M , Ungaretti L , American Mineralogist , 60 (1975) p.879-883, The crystal structure of ameghinite

Physical Properties of Ameghinite

Cleavage:

[???] Distinct, [???] Imperfect

Color:

Colorless.

Density:

2.02 - 2.03, Average = 2.02

Diaphaniety:

Transparent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Hardness:

2-3 - Gypsum-Calcite

Luminescence:

Fluorescent phosphorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Ameghinite

Gladstone-Dale:

CI meas= -0.039 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.032 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2443,KPDmeas= 0.2461,KC= 0.2368

Optical Data:

Biaxial (-), a=1.429, b=1.528, g=1.538, bire=0.1090

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Calculated Properties of Ameghinite

Electron Density:

r_electron=2.05 gm/cc
note: r_Ameghinite=2.04 gm/cc.

Fermion Index

Fermion Index = 0.03795
Boson Index = 0.96205

Photoelectric:

PE_Ameghinite= 0.48 barns/electron
U=PE_Ameghinite x r_electron= 0.99 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ameghinite is Not Radioactive

Ameghinite Classification

Dana Class:

25.3.1.1 (25)Anhydrous Borates Containing Hydroxyl or Halogen

(25.3)Dana Type

(25.3.1)Dana Group

25.3.1.1 Ameghinite NaB3O3(OH)4 C 2/c 2/m

Strunz Class:

V/H.05-10 V - Nitrates, Carbonates and Borates

V/H - Group borates. Planary and tetrahedral groups [B3O5]1- to [B6O10]2-

V/H.05 - Ameghinite series

V/H.05-10 Ameghinite NaB3O3(OH)4 C 2/c 2/m

Other Ameghinite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Ameghinite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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

Ameghinite

NaB3O3(OH)4
Dana No: 25.3.1.1 Strunz No: V/H.05-10
Locality:

Notes: