General Information:
Chemical Formula:
(Ca,Na,Sr)Nb4O11·8(H2O)
Composition:
(Molecular Weight = 734.68 gm)
Sodium 0.78 % Na
Strontium 1.79 % Sr
Calcium 3.27 % Ca
Niobium 50.58 % Nb
Hydrogen 2.20 % H
Oxygen 41.38 % O
Empirical Formula:
Ca0.6Na0.25Sr0.15Nb4O11·8(H2O)
Environment:
In vugs in a lawsonite-bearing sill.
IMA Status:
Approved IMA 1984
Locality:
Francon quarry, St. Michel district, Montreal, Quebec, Canada.
Name Origin:
Named for "Hochelaga," the Native American name for Montreal, Canada.
Physical Properties:
Cleavage:
None
Color:
white.
Density:
2.85 - 2.94, Average = 2.89
Diaphaniety:
Transparent to Translucent
Habits:
Microscopic Crystals - Crystals visible only with microscopes., Globular - Spherical, or nearly so, rounded forms (e.g. wavellite).,
Hardness:
4 - Fluorite
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
white
More details...