Hochelagaite Mineral Data

General Hochelagaite Information

Chemical Formula:

(Ca,Na,Sr)Nb4O11•8(H2O)

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

Empirical Formula:

Ca_0.6Na_0.25Sr_0.15Nb₄O₁₁•8(H₂O)

Environment:

In vugs in a lawsonite-bearing sill.

IMA Status:

Approved IMA 1986

Locality:

Francon quarry, St. Michel district, Montreal, Quebec, Canada. Link to MinDat.org Location Data.

Name Origin:

Named for "Hochelaga," the Native American name for Montreal, Canada.

Name Pronunciation:

Hochelagaite + Pronunciation

Synonym:

IMA1983-088

Hochelagaite Image

Images:

Hochelagaite

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., QuÃ©bec, Canada. Scale: Picture size 4.5 mm.
© Thomas Witzke / Abraxas-Verlag

Hochelagaite Crystallography

Axial Ratios:

a:b:c =1.5512:1:0.5004

Cell Dimensions:

a = 19.98, b = 12.88, c = 6.446, Z = 4; beta = 93.41° V = 1,655.89 Den(Calc)= 2.95

Crystal System:

Monoclinic Space Group: Unk

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 10(1), 3.115(0.8), 5.39(0.5),

Physical Properties of Hochelagaite

Cleavage:

None

Color:

White.

Density:

2.85 - 2.94, Average = 2.89

Diaphaneity:

Transparent to Translucent

Habit:

Globular - Spherical, or nearly so, rounded forms (e.g. wavellite).

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

4 - Fluorite

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Hochelagaite

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

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

Electron Density:

Bulk Density (Electron Density)=2.78 gm/cc
note: Specific Gravity of Hochelagaite =2.90 gm/cc.

Fermion Index:

Fermion Index = 0.0014983519
Boson Index = 0.9985016481

Photoelectric:

PE_Hochelagaite= 77.00 barns/electron
U=PE_Hochelagaite x rElectron Density= 213.89 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Hochelagaite is Not Radioactive

Hochelagaite Classification

Dana Class:

08.06.01.02 (08)Multiple Oxides with Nb, Ta, and Ti

(08.06)Dana Type

(08.06.01)Franconite Group

08.06.01.01 Franconite Na2Nb4O11•9(H2O) Unk Mono

08.06.01.02 Hochelagaite (Ca,Na,Sr)Nb4O11•8(H2O) Unk Mono

08.06.01.03 Ternovite! (Mg,Ca)Nb4O11-n(H2O)wheren~10 P 2/m,P 2,Pm Mono

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 ï¿½ (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

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

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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Hochelagaite

(Ca,Na,Sr)Nb4O11•8(H2O)
Dana No: 08.06.01.02 Strunz No: 04.FM.15
Locality:

Notes:

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