MKTA.MiMM'im U\IKsToM-> MUM 1'HT 



From il> associations tin- -:arnct \\ould I.e expected t. consist largely i.t the 

 Milantc and andradite molecule.-. Tin- rcfringence of the garnet us measured 

 Irom lia<_'meni- in No. s! is somewhat greater than 1-78. 



A'/)-W<.// i^ xenoblastic . In Nd. 7:10 it is essentially a corona mineral, ami i> 

 found as sin-li BUITOUnd ing garnet, pyroxene. scapolite plagioclasc. and calcite. Arouiui 

 {iirnet it is often closely associated with quart/ in vermicular Intel-growth. In these 

 Intel-growths caleite is often included, and they correspond to the svmplcktitic structures 

 -'derholm. 1 The epidote shows a well-developed basal cleavage, and is plc<thi<>n- 

 in yellow-green tints. 



I'niaxial grains of scapolite of negative sign and elongation is an abundant 

 tituent of No. 658. A typical pilaster texture is often given by this constituent. 



The liirefringence approximates 0-03. A secondary white mica with positive elongation 

 common alteration product. In No. 730 scapolite is absent and plagioclase take-, 



its place. Rock No. 849 shows pseudomorphs after (?) scapolite, in which white mica 



and /.oisite are the prime constituents. The birefringence of the unaltered mineral 



of these rocks indicates that the meionite member is predominant. 



M it-rtH-liiif grains with noticeable cross twinning are present in association with 

 pyroxene, and give a pflaster texture to bands which are rich in this felspar. 



In No. 730 plofjioclase is mueh decomposed, yielding aggregates of white mica. 

 These grains are often surrounded by a narrow rim of epidote. Some iw id plagioclasr 

 oligoclase is interspersed among potassic felspar grains. 



(Jitiirt- is a variable constituent, but is present in all three rocks. In No. 068 

 a number of vermicular intergrowths between scapolite and quart/ are revealed (cf. 

 symplektites of Sederholm). 



.\riiiitiliii- is developing at the expense of pyroxene in No. S4!i. 



Tiliimt, i, a constant member of the>e rocks. It may be associated with garnet, 

 but there is never any indication that it is secondarily derived from this mineral. 



(.->) I'YKOXK.M: Ki'ii)<iTK-M.\Kni 



Kock.- NOB. :5S. :HO. M\. W(\. and HUH are included within this da>s. They .ue 

 medium-grained rocks, rich in caleite (with the exception of No. llliS). On weathered 



'.ices, pyroxene and epidote project, the latter with the ch.irac tei isti. vellow-j 

 colouration. The epidote may be developed in narrow bands through the rock. 

 \b-taiiM.rphic tel>par and quart/ likewise project from the general >mface of the rock. 



The constituent minerals are m/r/V . / ,/,(!. *\,,<e. itcapnhtf. 



l>l<i | ijiuirt-.. ami in-1 ami itf . 



The !,,,,, I these mirks is of a hedenbergitic tyj.e in > and H\(t. with 



ie pleochroism, a- in the rocks of class (4). In NV I 1'^ Uu pyrOMM in thin 

 H less strongly coloured, but the extinction / r is not less than 17 to 48, 



1 Sederholm Bull. Conim. Ceol. Finl \ ^. I'JIfl. p. 'H. 



