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Archaeologia Cantiana - Vol. 55 - 1942 page 51
Report on Erratics from Stonar, Kent by D. Baden-Powell, B.Sc.
refractive index is less than that of Canada Balsam.
It is frequently spherulitic. No quartz was seen in the slide. Biotite
is both porphyritic and scattered through the groundmass, and sometimes
shows alteration to chlorite, and to magnetite. Accessory zircon occurs. |
10. BASIC DIORITE, or possibly
CAMPTONITE. Dark medium-grained, rather weathered rock, made up almost
entirely of zoned feldspars and hornblende in aproximately equal
quantities. The saussuritization of the basic centres of the feldspars
has gone too far for them to be identified, but the fresh rims suggest
oligoclase. The hornblende shows green, brown and yellow pleochroism.
Ilmenite and apatite also occur. |
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