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Ezcurrite

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About EzcurriteHide

Formula:
Na4B10O17 · 7H2O
Colour:
Colorless
Lustre:
Vitreous, Silky
Hardness:
3 - 3½
Specific Gravity:
2.053
Crystal System:
Triclinic
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 EzcurriteHide

Approved, 'Grandfathered' (first described prior to 1959)
6.EB.10

6 : BORATES
E : Pentaborates
B : Ino-pentaborates
26.5.5.1

26 : HYDRATED BORATES CONTAINING HYDROXYL OR HALOGEN
5 : Pentaborates
9.1.7

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

Physical Properties of EzcurriteHide

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

Optical Data of EzcurriteHide

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

Formula:
Na4B10O17 · 7H2O
IMA Formula:
Na2B5O7(OH)3 · 2H2O

Crystallography of EzcurriteHide

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 V:
484.69 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Bladed to fibrous prismatic crystals.

Type Occurrence of EzcurriteHide

Other Language Names for EzcurriteHide

German:Ezcurrit
Spanish:Ezcurrita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Tincalconite1 photo of Ezcurrite associated with Tincalconite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

6.EB.05Larderellite(NH4)B5O7(OH)2 · H2OMon.
6.EB.15ProbertiteNaCaB5O7(OH)4 · 3H2OMon. 2/m
6.EB.20TertschiteCa4B10O19 · 20H2O
6.EB.25PriceiteCa2B5O7(OH)5 · H2OMon. 2/m : P21/b

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

9.1.1SassoliteH3BO3Tric. 1 : P1
9.1.2MetaboriteHBO2Iso.
9.1.3DiomigniteLi2[B4O7]Tet.
9.1.4BiringucciteNa2B5O8(OH) · H2OMon.
9.1.5NasiniteNa2[B5O8(OH)] · 2H2OOrth.
9.1.6KerniteNa2[B4O6(OH)2] · 3H2OMon. 2/m : P2/b
9.1.8TincalconiteNa2(B4O7) · 5H2OTrig. 3 2 : R3 2
9.1.9BoraxNa2(B4O5)(OH)4 · 8H2OMon. 2/m : B2/b
9.1.10AmeghiniteNa(H4B3O7)Mon.
9.1.11SborgiteNa[B5O6(OH)4] · 3H2OMon.
9.1.12AristarainiteNa2MgB12O20 · 8H2OMon. 2/m : P21/b
9.1.13SantiteK[B5O6(OH)4] · 2H2OOrth.
9.1.14Larderellite(NH4)B5O7(OH)2 · H2OMon.
9.1.15Ammonioborite(NH4)2[B5O6(OH)4]2 · H2OMon. 2/m : B2/b
9.1.16Rhodizite(K,Cs)Al4Be4(B,Be)12O28Iso. 4 3m : P4 3m

Other InformationHide

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.

References for EzcurriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 EzcurriteHide

Localities for EzcurriteHide

ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Argentina (TL)
 
  • Salta
    • Los Andes department
      • Salar del Hombre Muerto
Am Min 52 (1967), 1048; Am Min 58:308-313; 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; A Summary and Geological Comparison. Turkish Journal of Earth Sciences, 9:1-27.
Mozambique
 
  • Zambezia Province
    • Alto Ligonha District
Thomas, R., Davidson, P. (2010): Hambergite-rich melt inclusions in morganite crystals from the Muiane pegmatite, Mozambique and some remarks on the paragenesis of hambergite. - Mineralogy and Petrology, 100, 3-4, 227-23
Mineral and/or Locality  
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