Ameghinite Mineral Data (original) (raw)

General Ameghinite Information

Help on Chemical Formula: Chemical Formula:

NaB3O3(OH)4

Help on Composition: 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

Help on Empirical Formula: Empirical Formula:

NaB3O3(OH)4

Help on Environment: Environment:

Massive borax in a borate-rich playa.

Help on IMA Status: IMA Status:

Approved IMA 1967

Help on Locality: Locality:

Tincalayu borax deposit, Salar del Hombre Muerto, Salta Province, Argentina. Link to MinDat.org Location Data.

Help on Name Origin: Name Origin:

Named for Carlos Ameghino (1865-1936) and Florentino Ameghino (1854-1911), both brothers and Argentine geologists.

Help on Name Pronunciation: Name Pronunciation:

Ameghinite + Pronunciation Say AMEGHINITE

Help on Synonym: Synonym:

ICSD 4219

PDF 20-1081

Ameghinite Image

Click Here for Larger Ameghinite Image in a New Browser Window Images:

Click Here for Larger Ameghinite Image Ameghinite Comments: Aggregate of white, elongated crystals of ameghinite. Location: Tincalayu Mine, Salta, Argentina.Scale: Specimen Size 1.5 x 1.5 x 1.5 cm. © Tom Loomis / Dakota Matrix

Ameghinite Crystallography

Help on Axial Ratios: Axial Ratios:

a:b:c =1.8648:1:0.6401

Help on Cell Dimensions: Cell Dimensions:

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

Help on Crystal System: Crystal System:

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

Help on X Ray Diffraction: X Ray Diffraction:

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

Click Here for Large Ameghinite Structure Window Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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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

Help on Cleavage: Cleavage:

{???} Distinct, {???} Imperfect

Help on Color: Color:

Colorless.

Help on Density: Density:

2.02 - 2.03, Average = 2.02

Help on Diaphaneity: Diaphaneity:

Transparent

Help on Fracture: Fracture:

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

Help on Hardness: Hardness:

2-3 - Gypsum-Calcite

Help on Luminescence: Luminescence:

Fluorescent and phosphorescent, Short UV=strong pale blue, Long UV=strong pale blue.

Help on Luster: Luster:

Vitreous (Glassy)

Help on Streak: Streak:

white

Optical Properties of Ameghinite

Help on Gladstone-Dale: 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
Ncalc = 1.48

Help on Optical Data: Optical Data:

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

Help on Pleochroism (x): Pleochroism (x):

colorless.

Help on Pleochroism (y): Pleochroism (y):

colorless.

Calculated Properties of Ameghinite

Help on Electron Density: Electron Density:

Bulk Density (Electron Density)=2.05 gm/cc
note: Specific Gravity of Ameghinite =2.04 gm/cc.

Help on Fermion Index: Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Help on Photoelectric: Photoelectric:

PEAmeghinite = 0.48 barns/electron
U=PEAmeghinite x rElectron Density= 0.99 barns/cc.

Help on Radioactivity: Radioactivity:

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

Ameghinite Classification

Help on Dana Class: Dana Class:

25.03.01.01 (25)Anhydrous Borates Containing Hydroxyl or Halogen

(25.03)Dana Type

(25.03.01)Dana Group

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

Help on Strunz Class: Strunz Class:

06.CA.10 06 - BORATES

06.C - Triborates

06.CA -Neso-triborates

06.CA.10 Ameghinite NaB3O3(OH)4 C 2/c 2/m

Other Ameghinite Information

Help on References: References:

NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

Help on See Also: See Also:

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

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

Ameghinite

NaB3O3(OH)4
Dana No: 25.03.01.01 Strunz No: 06.CA.10
Locality:

Notes: