The southern part of this parish is bounded by the hill of Clicker
Tor, which is entirely composed of a dark compact serpentine,
abounding in steatite, asbestos, tremolite, and other magnesian
minerals. The occurrence of this large mass of serpentine, amidst an
extensive tract of rocks belonging to the calcareous series, imparts
no little geological interest to this parish, which deserves therefore
to be more minutely examined; for the cursory observations hitherto
published have not satisfactorily developed the connection of this
serpentine with the adjoining rocks. In crossing the parish from north
to south, the rocks are first seen to consist of compact felspar and
hornblend, resembling those at Rosecradock in St. Clear; next they
become more schistose, and the hornblend forms only the colouring
material, as it does on the north of Leskeard town; at Pengover the
hornblend again abounds, and is intermixed with calcareous spar, as in
the vicinity of St. Ives. Approaching the church of Menheniot, the
rocks again put on the appearance of a true hornblend schist, and this
is succeeded by the serpentine of Clicker Tor.