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Esperanzaite

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About EsperanzaiteHide

Formula:
NaCa2Al2(AsO4)2(OH)F4 · 2H2O
Colour:
Pale blue-green
Lustre:
Vitreous
Hardness:
Specific Gravity:
3.24
Crystal System:
Monoclinic
Name:
Named after the discovery locality, the La Esperanza Mine, Durango, Mexico.
This page provides mineralogical data about Esperanzaite.


Classification of EsperanzaiteHide

Approved
Approval Year:
1998
8.DM.05

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
M : With large and medium-sized cations, (OH, etc.):RO4 > 2:1

Pronounciation of EsperanzaiteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of EsperanzaiteHide

Vitreous
Transparency:
Transparent, Translucent
Colour:
Pale blue-green
Hardness:
4½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
parallel to c
Fracture:
None observed
Density:
3.24 g/cm3 (Measured)    3.36 g/cm3 (Calculated)

Optical Data of EsperanzaiteHide

Type:
Biaxial (-)
RI values:
nα = 1.580 nβ = 1.588 nγ = 1.593
2V:
Measured: 74° , Calculated: 76°
Max Birefringence:
δ = 0.013
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r < v moderate
Pleochroism:
Non-pleochroic

Chemical Properties of EsperanzaiteHide

Formula:
NaCa2Al2(AsO4)2(OH)F4 · 2H2O
IMA Formula:
NaCa2Al2(AsO4)2F4(OH) · 2H2O

Crystallography of EsperanzaiteHide

Crystal System:
Monoclinic
Cell Parameters:
a = 9.687 Å, b = 10.7379 Å, c = 5.5523 Å
β = 105.32°
Ratio:
a:b:c = 0.902 : 1 : 0.517
Unit Cell V:
557.02 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Botryoidal patches to 0.8 cm across and radiating crystals in spheres to 1.5 mm in diameter.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
5.364(80)
4.796(80)
3.801(80)
3.527(90)
2.966(100)
2.700(90)

Type Occurrence of EsperanzaiteHide

Synonyms of EsperanzaiteHide

Other Language Names for EsperanzaiteHide

Related Minerals - Nickel-Strunz GroupingHide

8.DM.Betpakdalite-CaMg[Ca2(H2O)17Mg(H2O)6][Mo8As2Fe3+3O36(OH)] Mon. 2/m : B2/m
8.DM.Betpakdalite-FeFe[Fe3+2 (H2O)15(OH)2Fe3+(H2O)6][Mo8As2Fe3+3 O37]Mon. 2/m : B2/m
8.DM.05MoriniteNaCa2Al2(PO4)2(OH)F4 · 2H2OMon. 2/m
8.DM.10ClinotyroliteCa2Cu9(AsO4,SO4)4(OH,O)10 · 10H2OMon.
8.DM.10TyroliteCa2Cu9(AsO4)4(CO3)(OH)8 · 11H2OMon. 2/m
8.DM.15Betpakdalite-CaCa[Ca2(H2O)17Ca(H2O)6][Mo6+8As5+2Fe3+3O36(OH)]Mon. 2/m : B2/m
8.DM.15Melkovite[Ca2(H2O)15Ca(H2O)6][Mo8P2Fe3+3O36(OH)]Mon. 2/m : B2/m
8.DM.15Betpakdalite-NaCa[Na2(H2O)17Ca(H2O)6][Mo6+8As5+2Fe3+3O34(OH)3]Mon. 2/m : B2/m
8.DM.20Phosphovanadylite-BaBa[V4+4P2O8(OH)8]·12H2OIso.
8.DM.20Phosphovanadylite-CaCa[V4+4P2O12(OH)4] · 12H2O Iso. 4 3m : I4 3m
8.DM.25YukoniteCa3Fe3+(AsO4)2(OH)3 · 5H2OOrth. mm2
8.DM.30UdumineliteCa3Al8(PO4)2O12 · 2H2O
8.DM.35DelvauxiteCaFe4(PO4,SO4)2(OH)8 · 4-6H2O not confirmed · Amor.
8.DM.40Santafeite(Na,Ca,Sr)12(Mn2+,Fe3+,Al,Mg)8Mn4+8(VO4)16(OH,O)20 · 8H2OOrth. mmm (2/m 2/m 2/m)

Fluorescence of EsperanzaiteHide

not fluorescent

Other InformationHide

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 EsperanzaiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Foord, E.E., Hughes, J.M., Cureton, F.F. II, Maxwell, C.H., Falster, A.U., Sommer, A.J., Hlava, P.F. (1999): Esperanzaite, NaCa2Al2(As5+O4)2F4(OH)•2H2O, a new mineral species from the La Esperanza mine, Mexico: descriptive mineralogy and atomic arrangement. Canadian Mineralogist 37, 67-72

Internet Links for EsperanzaiteHide

Localities for EsperanzaiteHide

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 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.
Mexico (TL)
 
  • Durango
    • Mun. de Pánuco de Coronado
      • Francisco I. Madero
[Can. Mineral. (1999) 37, 67.; AmMin 85:263]
Mineral and/or Locality  
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