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Esperanzaite Mineral Data

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General Esperanzaite Information

Help on Chemical  Formula: Chemical Formula: NaCa2Al2(As+++++O4)2F4(OH)•2(H2O)
Help on Composition: Composition: Molecular Weight = 563.98 gm
   Sodium     4.08 %  Na    5.49 % Na2O
   Calcium   14.21 %  Ca   19.89 % CaO
   Aluminum   9.57 %  Al   18.08 % Al2O3
   Arsenic   26.57 %  As   40.75 % As2O5
   Hydrogen   0.89 %  H     7.99 % H2O
   Oxygen    31.21 %  O
   Fluorine  13.47 %  F    13.47 % F
               -   %   F    -5.67 % -O=F2    
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: NaCa2Al2(AsO4)2F4(OH)•2(H2O)
Help on Environment: Environment: Found as a secondary phase on mineralized rhyolite.
Help on IMA Status: IMA Status: Approved IMA 1999 (Dana # Added)
Help on Locality: Locality: La Esperanza mine, Zaragosa mining district, near Madero, State of Durango, Mexico. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the discovery locality.
Help on Name Pronunciation: Name Pronunciation: Esperanzaite + Pronunciation Say ESPERANZAITE
Help on Synonym: Synonym: IMA1998-025

Esperanzaite Image

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Comments: Pale blue-green botryoidal esperanzaite in rhyolite.
Location: Mina La Esperanza, Durango, Mexico. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Esperanzaite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9022:1:0.5171
Help on Cell Dimensions: Cell Dimensions: a = 9.687, b = 10.737, c = 5.5523, Z = 2; beta = 105.32° V = 556.97 Den(Calc)= 3.36
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.966(1), 2.7(0.9), 3.527(0.9),3.801(0.8), 4.796(0.8), 5.364(0.8),

Physical Properties of Esperanzaite

Help on Cleavage: Cleavage: {100} Perfect
Help on Color: Color: Blue green.
Help on Density: Density: 3.24
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Botryoidal - "Grape-like" rounded forms (e.g.. malachite).
Help on Habit: Habit: Spherical - Spherical, rounded aggregates.
Help on Hardness: Hardness: 4.5 - Between Fluorite and Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Esperanzaite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.042 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.076 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1747,KPDmeas= 0.1812,KC= 0.1891
Ncalc = 1.61 - 1.64
Help on Optical Data: Optical Data: Biaxial (-), a=1.58, b=1.588, g=1.593, bire=0.0130, 2V(Calc)=76, 2V(Meas)=74. Dispersion r < v moderate.

Calculated Properties of Esperanzaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.13 gm/cc
note: Specific Gravity of Esperanzaite =3.24 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0003429976
Boson Index = 0.9996570024
Help on Photoelectric: Photoelectric: PEEsperanzaite = 20.08 barns/electron
U=PEEsperanzaite x rElectron Density= 62.74 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Esperanzaite is Not Radioactive

Esperanzaite Classification

Help on  Dana Class: Dana Class: (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.04)where (AB)5 (XO4)2 Zq � x(H2O)
  (42.04.02)Morinite Group Morinite NaCa2Al2(PO4)2(F,OH)5•2(H2O) P 21/m 2/m Esperanzaite! NaCa2Al2(AsO4)2F4(OH)•2(H2O) P 21/m 2/m
Help on  Strunz Class: Strunz Class: 08.DM.05 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DM -With large and medium-sized cations, (OH, etc.):RO4 > 2:1
08.DM.05 Morinite NaCa2Al2(PO4)2(F,OH)5•2(H2O) P 21/m 2/m
08.DM.05 Esperanzaite! NaCa2Al2(AsO4)2F4(OH)•2(H2O) P 21/m 2/m

Other Esperanzaite Information

Help on References: References: NAME( CanMin 8/99) PHYS. PROP.(CanMin, 2/99) OPTIC PROP.(CanMin, 2/99)
Help on See Also: See Also: Links to other databases for Esperanzaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Dana No: Strunz No: 08.DM.05





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