Mineralogy Database

Ameghinite Mineral Data

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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

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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 - Prismatic H-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),

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)Anhydrous Borates Containing Hydroxyl or Halogen
  (25.03)Dana Type
  (25.03.01)Dana Group 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

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Dana No: Strunz No: 06.CA.10





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