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Ameghinite

A valid IMA mineral species

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Photos of Ameghinite (3)

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Ameghinite

Tincalayu Mine, Antofagasta de la Sierra Department, Catamarca Province, Argentina

Ameghinite

Tincalayu Mine, Antofagasta de la Sierra Department, Catamarca Province, Argentina

Ameghinite

Tincalayu Mine, Antofagasta de la Sierra Department, Catamarca Province, Argentina

Ameghinite

Tincalayu Mine, Antofagasta de la Sierra Department, Catamarca Province, Argentina

Ameghinite

Tincalayu Mine, Antofagasta de la Sierra Department, Catamarca Province, Argentina

Ameghinite

Tincalayu Mine, Antofagasta de la Sierra Department, Catamarca Province, Argentina

Ameghinite

Tincalayu Mine, Antofagasta de la Sierra Department, Catamarca Province, Argentina

Ameghinite

Tincalayu Mine, Antofagasta de la Sierra Department, Catamarca Province, Argentina

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About AmeghiniteHide

Carlos Ameghino

Formula:

Na(H₄B₃O₇)

Colour:

Colourless

Lustre:

Vitreous

Hardness:

2 - 3

Specific Gravity:

2.030

Crystal System:

Monoclinic

Name:

Named in honor of the brothers Carlos Ameghino (16 June 1865 – 12 April 1936) and

Florentino Ameghino

(September 18, 1854 – August 6, 1911), Argentine geologists.

Type Locality:

ⓘ Tincalayu Mine, Antofagasta de la Sierra Department, Catamarca Province, Argentina

This page provides mineralogical data about Ameghinite.

Unique IdentifiersHide

Mindat ID:

195

Long-form identifier:

mindat:1:1:195:3

GUID
(UUID V4):

ef71a40d-c5f8-429e-98f0-8d2335f98c37

IMA Classification of AmeghiniteHide

IMA status:

Approved

IMA Formula:

NaB₃O₃(OH)₄

Approval year:

1966

Type description reference:

Aristarain, L.F., Hurlbut, C.S. (1967) Ameghinite, Na2O·3B2O3·4H2O, a new borate from Argentina. American Mineralogist: 52: 935-946.

Classification of AmeghiniteHide

Strunz-mindat (2023):

6.CA.10

6 : BORATES
C : Triborates
A : Neso-triborates

Dana 8th ed.:

25.3.1.1

25 : ANHYDROUS BORATES CONTAINING HYDROXYL OR HALOGEN
3 : Triborates

Hey's CIM Ref.:

9.1.10

9 : Borates
1 : Borates of the alkalis and boric acid

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Symbol	Source	Reference
Agh	IMA–CNMNC	Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of AmeghiniteHide

Lustre:

Vitreous

Transparency:

Transparent

Colour:

Colourless

Hardness:

2 - 3 on Mohs scale

Tenacity:

Brittle

Cleavage:

Very Good
{100}, very good; {001} and {010}, poor.

Fracture:

Conchoidal

Density:

2.030(6) g/cm³ (Measured) 2.037 g/cm³ (Calculated)

Optical Data of AmeghiniteHide

Type:

Biaxial (-)

RI values:

n_α = 1.429 n_β = 1.528 n_γ = 1.538

2V:

Measured: 33°

Max Birefringence:

δ = 0.109

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Surface Relief:

Low

Dispersion:

Chemistry of AmeghiniteHide

Mindat Formula:

Na(H₄B₃O₇)

Elements listed:

B, H, Na, O - search for minerals with similar chemistry

Crystallography of AmeghiniteHide

Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Space Group:

B2/b

Setting:

C2/c

Cell Parameters:

a = 18.45 Å, b = 9.89 Å, c = 6.32 Å
β = 104.3°

Ratio:

a:b:c = 1.866 : 1 : 0.639

Unit Cell V:

1,117.48 Å³ (Calculated from Unit Cell)

Morphology:

Crystals are elongated along [010], may be bent or curved, showing {001}, {010}, {100}, {110}, {011}, {101}, {101}, {310}, to 5 mm; as cluster of crystals and nodular masses.

Crystal StructureHide

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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure

ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0000470	Ameghinite	Dal Negro A, Pozas J M M, Ungaretti L (1975) The crystal structure of ameghinite American Mineralogist 60 879-883		1975		0	293

CIF Raw Data - click here to close

data_global
_chemical_name_mineral 'Ameghinite'
loop_
_publ_author_name
'Dal Negro A'
'Pozas J M M'
'Ungaretti L'
_journal_name_full 'American Mineralogist'
_journal_volume 60 
_journal_year 1975
_journal_page_first 879
_journal_page_last 883
_publ_section_title
;
 The crystal structure of ameghinite
;
_database_code_amcsd 0000470
_chemical_formula_sum 'Na B3 O7 H4'
_cell_length_a 18.428
_cell_length_b 9.882
_cell_length_c 6.326
_cell_angle_alpha 90
_cell_angle_beta 104.4
_cell_angle_gamma 90
_cell_volume 1115.807
_exptl_crystal_density_diffrn      2.041
_symmetry_space_group_name_H-M 'C 1 2/c 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2+y,z'
  'x,-y,1/2+z'
  '1/2+x,1/2-y,1/2+z'
  '-x,y,1/2-z'
  '1/2-x,1/2+y,1/2-z'
  '-x,-y,-z'
  '1/2-x,1/2-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
Na   0.17300   0.23800   0.10320   0.02077
B1   0.34120   0.17160   0.44140   0.01355
B2   0.40280   0.39870   0.49590   0.01444
B3   0.47780   0.19940   0.48280   0.01418
O-h1   0.54940   0.15750   0.49640   0.02052
O-h2   0.30110   0.16060   0.21500   0.01634
O-h3   0.30580   0.10160   0.59290   0.01710
O-h4   0.39860   0.53520   0.51640   0.02039
O5   0.47010   0.34010   0.48120   0.01874
O6   0.34370   0.31960   0.49900   0.01900
O7   0.41940   0.11770   0.48000   0.01596
H1   0.56100   0.05900   0.50500   0.03800
H2   0.30300   0.06500   0.17100   0.03800
H3   0.25200   0.13000   0.56000   0.03800
H4   0.44700   0.58100   0.51700   0.03800
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
Na 0.01801 0.02444 0.02413 0.00493 0.00896 0.00115
B1 0.00865 0.00965 0.02090 -0.00004 0.00224 0.00061
B2 0.01535 0.01465 0.01355 0.00092 0.00394 0.00226
B3 0.01270 0.01703 0.01543 -0.00257 0.00605 -0.00217
O-h1 0.01199 0.01377 0.03619 0.00203 0.00647 0.00310
O-h2 0.01401 0.01721 0.01655 -0.00158 0.00298 0.00167
O-h3 0.01453 0.01543 0.01976 -0.00337 0.00243 0.00078
O-h4 0.01514 0.01321 0.03645 0.00345 0.01005 0.00982
O5 0.01104 0.01134 0.03093 0.00066 0.00255 0.00396
O6 0.01154 0.01156 0.03057 0.00080 0.00193 -0.00186
O7 0.01175 0.01180 0.02642 0.00189 0.00678 0.00545

X-Ray Powder DiffractionHide

Powder Diffraction Data:

d-spacing	Intensity
3.064 Å	(100)
3.147 Å	(76)
2.548 Å	(29)
3.352 Å	(17)
2.914 Å	(17)
4.951 Å	(13)
2.655 Å	(11)

Geological EnvironmentHide

Paragenetic Mode(s):

Paragenetic Mode	Earliest Age (Ga)
Near-surface Processes
25 : Evaporites (prebiotic)

Type Occurrence of AmeghiniteHide

Type Locality:

ⓘ Tincalayu Mine, Antofagasta de la Sierra Department, Catamarca Province, Argentina

Place of Conservation of Type Material:

Natural History Museum, Paris, France; Harvard University, Cambridge, Massachusetts, 109054; National Museum of Natural History, Washington, D.C., USA, 137297.

Geological Setting of Type Material:

Formed in massive borax in a borate-rich playa.

Associated Minerals at Type Locality:

Reference:

Aristarain, L.F., Hurlbut, C.S. (1967) Ameghinite, Na2O·3B2O3·4H2O, a new borate from Argentina. American Mineralogist: 52: 935-946.

Synonyms of AmeghiniteHide

IMA1966-034

Other Language Names for AmeghiniteHide

German:Ameghinit

Russian:Амегинит

Spanish:Ameghinita

Related Minerals - Strunz-mindat Grouping Hide

6.CA.15	Inderite	MgB₃O₃(OH)₅ · 5H₂O	Mon. 2/m : P2₁/b
6.CA.20	Kurnakovite	MgB₃O₃(OH)₅ · 5H₂O	Tric. 1 : P1
6.CA.25	Inderborite	CaMg(H₃B₃O₇)₂ · 8H₂O	Mon. 2/m : B2/b
6.CA.30	Meyerhofferite	CaB₃O₃(OH)₅ · H₂O	Tric. 1 : P1
6.CA.35	Inyoite	Ca(H₄B₃O₇)(OH) · 4H₂O	Mon. 2/m : P2₁/b
6.CA.40	Solongoite	Ca₂(H₃B₃O₇)(OH)Cl	Mon. 2/m : P2₁/b
6.CA.45	Peprossiite-(Ce)	(Ce,La)(Al₃O)_2/3B₄O₁₀	Hex. 6 m2 : P6₂m
6.CA.50	Nifontovite	Ca₃B₆O₆(OH)₁₂(H₂O)₂	Mon. 2/m : B2/b
6.CA.55	Olshanskyite	Ca₂[B₃O₃(OH)₆](OH) · 3H₂O	Tric.

Fluorescence of AmeghiniteHide

In UV light:

pale blue fluorescence and phosphorescence under SW and LW UV.

Other InformationHide

Thermal Behaviour:

Tincalayu material [cm^-1]: 3540sh, 3405, 3265s, 1530s, 1467, 1431, 1355, 1324s, 1264, 1210, 1178, 1139, 1061s, 1024s, 1004sh, 985sh, 875s, 855sh, 766s, 739, 721, 638s, 630w, 618, 531w, 523, 500, 477

Notes:

soluble in water

Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for AmeghiniteHide

mindat.org URL:

https://www.mindat.org/min-195.html
Please feel free to link to this page.

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External Links:

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Raman and XRD data at RRUFF project

References and PDF downloads at RRUFF project

American Mineralogist Crystal Structure Database

Handbook of Mineralogy page PDF

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References for AmeghiniteHide

Reference List:

Aristarain, L.F., Hurlbut, C.S. (1967) Ameghinite, Na2O·3B2O3·4H2O, a new borate from Argentina. American Mineralogist: 52: 935-946.

Dal Negro, Alberto Alberto, Pozas, Jose M., Ungaretti, Luciano (1975) The crystal structure of ameghinite. American Mineralogist, 60 (9-10) 879-883

Frost, Ray L., Xi, Yunfei (2012) Raman spectroscopy of the borate mineral ameghinite NaB₃O₃(OH)₄. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 96. 89-94 doi:10.1016/j.saa.2012.04.087

Chukanov, Nikita V. (2014) Springer Geochemistry/Mineralogy - Infrared spectra of mineral species. Springer Netherlands. doi:10.1007/978-94-007-7128-4

(2023) Ameghinite. Handbook of Mineralogy. Mineralogical Society of America

Localities for AmeghiniteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the

symbol to view information about a locality. The

symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed.

- This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality.

- Good crystals or important locality for species.

- World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). ~~Struck out~~ - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.

Argentina (TL)

Catamarca Province

Antofagasta de la Sierra Department

ⓘ Tincalayu Mine (TL)

A Summary and Geological Comparison. Turkish Journal of Earth Sciences, 9, 1-27.

Aristarain, L. F., Hurlbut, C. S., Jr,, (1967) Ameghinite, Na2O·3B2O3·4H2O, a. new borate from Argentina. American Mineralogist, 52 (7-8) 935-945

Hurlbut, C. S., Aristarain, L. F., Erd, and R. C. (1973) Kernite from Tincalayu, Salta, Argentina. American Mineralogist, 58 (3-4) 308-313

Alonso, R. N. (1999). On the origin of La Puna borates. Acta geológica hispánica, 34(2), 141-166.

CAHIT HELVACI & RICARDO N. ALONSO (2000) Borate Deposits of Turkey and Argentina

Ameghinite

About AmeghiniteHide

Unique IdentifiersHide

IMA Classification of AmeghiniteHide

Classification of AmeghiniteHide

Mineral SymbolsHide

Physical Properties of AmeghiniteHide

Optical Data of AmeghiniteHide

Chemistry of AmeghiniteHide

Crystallography of AmeghiniteHide

Crystal StructureHide

X-Ray Powder DiffractionHide

Geological EnvironmentHide

Type Occurrence of AmeghiniteHide

Synonyms of AmeghiniteHide

Other Language Names for AmeghiniteHide

Related Minerals - Strunz-mindat GroupingHide

Fluorescence of AmeghiniteHide

Other InformationHide

Internet Links for AmeghiniteHide

References for AmeghiniteHide

Localities for AmeghiniteHide

Locality ListHide

Related Minerals - Strunz-mindat Grouping Hide