Meddelelser om Grønland . has not before been found in theilvaite; it is determined by lyingin the zone (411:210), and bythe angles :. Fig. 14. Ilvaite, type XIII. — —Ç-,— . „ . Number of Calculated variations measu,.ei,ients value ?:? = (621):(210)=1?°472 14°14—15°55 2 14=57V2 The prismatic zone is always very highly striated, and givesa very great number of reflexes, which is also the case withthat piece of the zone of brachydomes lying between (012) and(012); ciOOl), which is always very long and narrow, is trans-versely striated by being combined with the two mentioned the
Meddelelser om Grønland . has not before been found in theilvaite; it is determined by lyingin the zone (411:210), and bythe angles :. Fig. 14. Ilvaite, type XIII. — —Ç-,— . „ . Number of Calculated variations measu,.ei,ients value ?:? = (621):(210)=1?°472 14°14—15°55 2 14=57V2 The prismatic zone is always very highly striated, and givesa very great number of reflexes, which is also the case withthat piece of the zone of brachydomes lying between (012) and(012); ciOOl), which is always very long and narrow, is trans-versely striated by being combined with the two mentioned the crystals are well developed with bright faces,which is, however, only the case to a smaller degree in thelarger crystals. Type XIV. Of this form we have an exceedingly rich material, almostequal to that of type 1. The crystals are generally larger thanin this latter type, as a rule between 5 and 20 mm. 69 All the pieces are from one single pegmatite vein of thetransformed foyaite. The vein is still more transformed thanthe rock itself, so that nothing of the original structure can betraced. The presence of an
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectgeology, booksubjects
