' = bas

(cHost PYROXENES), WHICH MAY REFLECT A GKAOUAL CHANCE IN THE CONPOS=
ITION OF THE ORIGINAL PERIDOTIVE YOWARD THE HANGINGWALL AND HEECE ITS
SUSCEPTIBILITY TO ss Suiin ita cela aes nis AND YHE FORMATION OF CHRYSOTILE.
HERE, THE CHANGE FROM ORE TO MARGINAL OR LOW GRADE MAYERIAL 1S

GRADATIONAL.
F) MineraLocy

THE ORE~BEARING SERPENTINE HAS A MOTTLED LICHT APPLE~cREEN
TO DARK GREEN COLOUR, A GREASY TO sHKeaiee AND A BLOCKY FRACTURE.
It 1S SPOTTED WITH BENT, GLISTENING, BRONZE COLOURED "GHOST CRYSTALS",
pedenaburiewe AFTER ORTHOPYROXENES, CALLED "Bastites”. MAGNETITE 1S
COMMON AS DISSEMINATIONS AND NARROW VEINLETS, SOMETIMES IN THE SERPEN=

TINE BUT USUALLY AS SELVEDGES AND PARTINGS IN THE VEINS.

THE SHEARED SERPENTINE 1S GENERALLY DARK GREEN TO PURPLISH
BLACK. IT FORMS GLOSSY, PLATY FLAKES AND LENSES, GENERALLY TERED
rips sumsone®™ SERPENTINE. DARK GREEH PICROLITE, A COLUMNAR TO epeepex
FIBROUS FORM OF SERPENTINE, 1S COMMON IN SHEAR ZONES, ALONG WITH PALE
GREEN TO WHITE, FOLIATED TALC AND A CRYSTALLINE FORM OF WHITE MAGNES=
1TE. MAGNETITE ALSO TENDS “0 OCCUR IN THE SHEARED’ ZONES IN LONG
THREADS PARALLEL TO THE DIRECTION OF neednan: Tuts 1S KNOWN AS
teabeewe MAGNETITE" AND SUGGESTS EITHER PLASTIC FLOW OR CRYSTALLIZ—

ATION COINCIDENT WITH MOVEMENT.

Microscopic stuoy sy H. GasrRi€LSE REVEALS THAT THE SERPEN—
‘9
TINE HAS BEEN FORMED BY THE ALTERATION OF OLIVINE, ORTHOPYROXENE AND
CLINOPYROXENE, GIVING RISE TO MESH-STRUCTURE SERPENTINE, WITH ISLANDS
OF HOMOGENOUS SERPENTINE PSEUDOMORPHOUS AFTER PYROXENE. He sucGestTs

THAT OLIVINE ALTERS TO CHRYSOTILE AND ORTHOPYROXENE TO ANTIGORITE.