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Images
Formula: Ca2MnZrNa3Ti(Si2O7)2(OF)F2
Sorosilicate (Si2O7 groups), rinkite group,
seidozerite supergroup,
manganese-, zirconium- and
titanium- bearing mineral
Crystal system: Triclinic
Specific gravity: 3.32 measured
Hardness: 5
Streak: White
Colour: Colourless to pale brown
Luminescence: No fluorescence under UV
Environments
Localities
At the Demix-Varennes quarry, Saint-Amable sill, Varennes & St-Amable, Lajemmerais RCM, Montérégie, Québec, Canada,
kochite has been found
(Mindat photo).
Kochite from the Demix-Varennes Quarry -
Image
At the type locality, Mount Hvide Ryg north slope, Werner Bjerge Complex, Northeast Greenland National Park,
Greenland, kochite occurs in nepheline syenite as
lath-shaped to acicular crystals in aggregates up to 0.3 × 1.0 mm in size. Associated minerals are
nepheline,
alkali feldspar and
låvenite. Kochite is transparent with
a brownish colour and a vitreous lustre. It is brittle with a perfect cleavage and an uneven fracture
(EJM 15.551-554).
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