Sulphide, valleriite group
Specific gravity: 2.96 to 2.99
Hardness: 1 to 1½
Plutonic igneous environments
Tochilinite occurs in sulphide-rich serpentinised
ultramafic bodies, where it may be abundant, in
diamond pipes and in some carbonaceous
At Bancroft, Ontario, Canada, tochilinite is associated with pyrrhotite, forsterite, clinohumite, hydromagnesite, graphite and calcite (HOM).
At the type locality, the Nizhnii Mamon Cu-Ni Deposit, Nizhnii Mamon Village, Upper Don River, Voronezh Oblast, Russia, tochilinite occurs as radiating aggregates of cylindrical acicular crystals, which may be hollow, to 1 cm, as paper-thin coatings, as felted masses and as clots (Mindat). It has been found in lizardite from drill cores (AM 57.1552). Associated minerals include troilite, pyrrhotite, sphalerite, calcite and lizardite (HOM ).
At Hunting Hill quarry, Maryland, tochinilite is found rarely as prismatic crystals or sprays to 1.1 cm on calcite (Minrec 36.5.444).
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