Mineralogy Database

Hochelagaite Mineral Data

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General Hochelagaite Information

Help on Chemical  Formula: Chemical Formula: (Ca,Na,Sr)Nb4O11•8(H2O)
Help on Composition: Composition: Molecular Weight = 734.68 gm
   Sodium      0.78 %  Na    1.05 % Na2O
   Strontium   1.79 %  Sr    2.12 % SrO
   Calcium     3.27 %  Ca    4.58 % CaO
   Niobium    50.58 %  Nb   72.36 % Nb2O5
   Hydrogen    2.20 %  H    19.62 % H2O
   Oxygen     41.38 %  O
             ______        ______ 
             100.00 %       99.73 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca0.6Na0.25Sr0.15Nb4O11•8(H2O)
Help on Environment: Environment: In vugs in a lawsonite-bearing sill.
Help on IMA Status: IMA Status: Approved IMA 1986
Help on Locality: Locality: Francon quarry, St. Michel district, Montreal, Quebec, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for "Hochelaga," the Native American name for Montreal, Canada.
Help on Name Pronunciation: Name Pronunciation: Hochelagaite + Pronunciation Say HOCHELAGAITE
Help on Synonym: Synonym: IMA1983-088

Hochelagaite Image

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Comments: White aggregate of small fibrous crystals of hochelagaite in matrix.
Location: Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry), Mt Saint-Hilaire, Rouville Co., Québec, Canada. Scale: Picture size 4.5 mm.
© Thomas Witzke / Abraxas-Verlag

Hochelagaite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.5512:1:0.5004
Help on Cell Dimensions: Cell Dimensions: a = 19.98, b = 12.88, c = 6.446, Z = 4; beta = 93.41° V = 1,655.89 Den(Calc)= 2.95
Help on Crystal System: Crystal System: Monoclinic Space Group: Unk
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 10(1), 3.115(0.8), 5.39(0.5),

Physical Properties of Hochelagaite

Help on Cleavage: Cleavage: None
Help on Color: Color: White.
Help on Density: Density: 2.85 - 2.94, Average = 2.89
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Habit: Habit: Globular - Spherical, or nearly so, rounded forms (e.g. wavellite).
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Hardness: Hardness: 4 - Fluorite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Hochelagaite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.017 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.036 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2655,KPDmeas= 0.2706,KC= 0.2753
Ncalc = 1.78 - 1.81
Help on Optical Data: Optical Data: Biaxial (+), a=1.72, b=1.81, g=1.82, bire=0.1000, 2V(Calc)=34, 2V(Meas)=35.

Calculated Properties of Hochelagaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.78 gm/cc
note: Specific Gravity of Hochelagaite =2.90 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0014983519
Boson Index = 0.9985016481
Help on Photoelectric: Photoelectric: PEHochelagaite = 77.00 barns/electron
U=PEHochelagaite x rElectron Density= 213.89 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Hochelagaite is Not Radioactive

Hochelagaite Classification

Help on  Dana Class: Dana Class: (08)Multiple Oxides with Nb, Ta, and Ti
  (08.06)Dana Type
  (08.06.01)Franconite Group Franconite Na2Nb4O11•9(H2O) Unk Mono Hochelagaite (Ca,Na,Sr)Nb4O11•8(H2O) Unk Mono Ternovite! (Mg,Ca)Nb4O11-n(H2O)wheren~10 P 2/m,P 2,Pm Mono
Help on  Strunz Class: Strunz Class: 04.FM.15 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.F - Hydroxides (without V or U)
  04.FM -Hydroxides with H2O � (OH); Unclassified
04.FM.15 Franconite Na2Nb4O11•9(H2O) Unk Mono
04.FM.15 Hochelagaite (Ca,Na,Sr)Nb4O11•8(H2O) Unk Mono
04.FM.15 Ternovite! (Mg,Ca)Nb4O11-n(H2O)wheren~10 P 2/m,P 2,Pm Mono

Other Hochelagaite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Hochelagaite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - EUROmin Project
6 - Ecole des Mines de Paris
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info

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Dana No: Strunz No: 04.FM.15





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