Mineralogical Magazine, volume 4

Cover Mineralogical Magazine, volume 4
Mineralogical Magazine, volume 4
Mineralogical Society (Great Britain)
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97 and 98. Electrum growths increased in bulk.
502 The scoop-like electrum-growth is now J-inch in length ; has curved further into the cavity by nearly 1-1 6th of aninch, has become stouter, and more rugged. The trefoil-like growth in the gossany- cavity has changed its shape by the elongationof its centre-portion.
On page 181, No. 22*. Electrum-growths increased, and recent ones have appeared in the undecompoaed marcasite.
207. Electrum-growths palpably increased. The " broad-growth*' at the
...thinnest edge of the specimen in May, 1877, was barely 1-1 6th of an inch high ; it is now more than ^th of an inch.
1 1 7* (Mispickel.) The electrum in this specimen has grown fully ^th of an inch since I measured it in Decomber last, it thinned out in its process of elongation, and electrum J x 3-16ths inch grew off.
Since then, the grown-off portion has curled a little at the edges, and has a tendency to isometric crystaUization.
The remainder of the electrum -shape attached to the quartz and unassociated with the auro-pyritous minerai, has sensibly increased in bulk ; exhibits a tendency to cubical-crystallization, and is now beauti- ully bright.


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