Some Kyaxite-bearikg Eock^ prom the Eastern Goldfieeds, 
Western Australia. 9 
2.— SOME KYANITE-BEARING ROCKS FROM THE 
EASTERN GOLDFIELDS, WESTERN AUSTRALIAN 
By Keith K. Mtles^ B.Se. (Hons.). 
Uend KUh August, 1940: Pulilished I’dth Xovuud)er, 1941. 
COXTEXTS. 
Tnti'oduetion 
The Camel Humps, Mt. Margaret Goldfield 
Field oceurrenee 
Petrography 
. Mt. Leonora, Alt. Alargaret Goldfield 
Field 0(‘eiivrence 
Petrography 
Alt. Kenneth, Valgoo Goldfield 
Fiehl oeeurrenee 
Petrography 
LJuinu’s, ^riireliison Goldfield 
Field oeeiirreiiee 
Petrography 
Origin and ATetamorphism 
The Camel Humps and Alt. Leonora 
Alt. Kenneth and Quinn’s Roeks 
Summary 
Ackuowletlgments 
Referenees 
Roc-ks 
Page 
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IXTRODCCTIOX. 
AA^'hile engaged in a ))rograinnie. of Held Mork iiiuh'rtaken by the Geo- 
logical Survey in the country north of Laverton, Alt. Margaret Go]dfi(4d, 
during the winter of 1939, the \\'riter noted and mapped at a spot known 
ns the Camel Humps, an interesting occurrence of a variety of rock Intherlo 
unrecorded from this district. This is a kyaniU'-bearing (juailz schist, a 
fairly high grade metamorphic type, and part of the Older Greenstone 
Series (Pre-Cambrian) which forms a narrow belt of anrifiTous c(umtrY in 
this portion of the State. 
Comparison of this i-ock witli rallu'r similar looking imdamorpincs from 
a numb(‘r of other localilies in the Eastern Goldfields has led to the discovery 
or contirmation by the writer, of the existence of kyanite in several of thes(‘ 
latter rocks also, and the object of this iiaper is to give* a brief desci i])tion 
of the occurrence and petrology of these interesting rocks. 
The presence of the mineral kyanite in ci'ystalliiK' scliists is of ju'cnliar 
interest, because of the light that it may shed upon flu* origin, constitution 
and metanuH'phic history of the rock in Avhich it is developed. It is a silicate 
of aluminium, AUO.SiO.,, and is generally recognised as one of the few 
tyidcal ‘^stress minerals’’ (1), and appears to form only at definite stages 
in progressive regional metamorphism. It is a mineral which is peculiarly 
sensitive to changes in temperature and i)ressure conditions, and requires 
* Piibliyhetl by permission of the Government Geologist of W'estern Australia. 
