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Ezcurrite

Big Photo

Tincalayu Mine, Salar Del Hombre Muerto, Salta, Argentina
© Simone Citon

Show Ezcurrite Photos (4)
Formula:
Na
 
4
B
 
10
O
 
17
·7H
 
2
O
System:TriclinicColour:Colorless
Hardness:3 - 3½
Name:For Juan Manuel de Ezcurra (1900-1970), manager of the Compania Productora de Boratos SA
This page provides mineralogical data about Ezcurrite.

Classification of Ezcurrite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:5/J.05-20
Nickel-Strunz 10th (pending) edition ID:6.EB.10

6 : BORATES
E : Pentaborates
B : Ino-pentaborates
Dana 8th edition ID:26.5.5.1

26 : HYDRATED BORATES CONTAINING HYDROXYL OR HALOGEN
5 : Pentaborates
Hey's CIM Ref.:9.1.7

9 : Borates
1 : Borates of the alkalis and boric acid
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Type Occurrence of Ezcurrite

Type Locality:Tincalayu Mine, Salar Del Hombre Muerto, Salta, Argentina
Year of Discovery:1957
Geological Setting of type material:Playa

Physical Properties of Ezcurrite

Lustre:Vitreous, Silky
Diaphaneity (Transparency):Transparent
Colour:Colorless
Hardness (Mohs):3 - 3½
Tenacity:Brittle
Cleavage:Perfect
Excellent on {110}, good on {100}, fair {126}, poor on {110}{101}
Density (measured):2.053 g/cm3
Density (calculated):2.049 g/cm3

Crystallography of Ezcurrite

Crystal System:Triclinic
Class (H-M):1 - Pinacoidal
Space Group:P1
Cell Parameters:a = 8.598(2) Å, b = 9.570(2) Å, c = 6.576(2) Å
α = 102.75°, β = 107.5°, γ = 71.51°
Ratio:a:b:c = 0.898 : 1 : 0.687
Unit Cell Volume:V 484.69 ų (Calculated from Unit Cell)
Z:1
Morphology:Bladed to fibrous prismatic crystals.

Optical Data of Ezcurrite

Type:Biaxial (-)
RI values: nα = 1.468 nβ = 1.507 nγ = 1.529
2V:Measured: 73° , Calculated: 72°
Maximum Birefringence:δ = 0.061

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low
Dispersion:relatively weak r > v

Chemical Properties of Ezcurrite

Formula:
Na
 
4
B
 
10
O
 
17
·7H
 
2
O
Essential elements:B, H, Na, O
All elements listed in formula:B, H, Na, O

Relationship of Ezcurrite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
6.EB.05Larderellite
(NH
 
4
)B
 
5
O
 
6
(OH)
 
4
6.EB.15Probertite
NaCaB
 
5
O
 
7
(OH)
 
4
·3H
 
2
O
6.EB.20Tertschite
Ca
 
4
B
 
10
O
 
19
·20H
 
2
O
6.EB.25Priceite
Ca
 
2
B
 
5
O
 
7
(OH)
 
5
·H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
9.1.1Sassolite
H
 
3
BO
 
3
9.1.2Metaborite
HBO
 
2
9.1.3Diomignite
Li
 
2
[B
 
4
O
 
7
]
9.1.4Biringuccite
Na
 
2
B
 
5
O
 
8
(OH)·H
 
2
O
9.1.5Nasinite
Na
 
4
B
 
10
O
 
17
·5H
 
2
O
9.1.6Kernite
Na
 
2
[B
 
4
O
 
6
(OH)
 
2
] · 3H
 
2
O
9.1.8Tincalconite
Na
 
2
[B
 
4
O
 
7
] · 5H
 
2
O
9.1.9Borax
Na
 
2
[B
 
4
O
 
7
] · 10H
 
2
O
9.1.10Ameghinite
Na(H
 
4
B
 
3
O
 
7
)
9.1.11Sborgite
Na[B
 
5
O
 
6
(OH)
 
4
] · 3H
 
2
O
9.1.12Aristarainite
Na
 
2
MgB
 
12
O
 
20
·8H
 
2
O
9.1.13Santite
K[B
 
5
O
 
6
(OH)
 
4
] · 2H
 
2
O
9.1.14Larderellite
(NH
 
4
)B
 
5
O
 
6
(OH)
 
4
9.1.15Ammonioborite
(NH
 
4
)
 
2
[B
 
5
O
 
6
(OH)
 
4
]
 
2
 · H
 
2
O
9.1.16Rhodizite
(K,Cs)Al
 
4
Be
 
4
(B,Be)
 
12
O
 
28

Other Names for Ezcurrite

Other Languages:
German:Ezcurrit
Russian:Эзкуррит
Spanish:Ezcurrita

Other Information

Other Information:Soluble in water
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Ezcurrite

Reference List:Muessig, S. & R.D. Allen (1957), Ezcurrite (2Na2O·7H2O), a new sodium borate from Argentina; occurrence, mineralogy, and associated minerals, Economic Geology: 52: 426-437.

American Mineralogist (1957): 42: 919.

American Mineralogist (1973): 58: 110-115.

Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

Internet Links for Ezcurrite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
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  • Ezcurrite details from Handbook of Mineralogy (PDF)
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    Localities for Ezcurrite

    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Argentina
     
    • Salta
      • Salar Del Hombre Muerto
    		Am Min 52 (1967), 1048; Am Min 58:308-313
    Mineral and/or Locality
    Google
     
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