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Updated: August 3, 2024
Plagioclase, microcline and quartz are the predominating minerals, while biotite, titanite, epidote, apatite, zircon and garnet are present in smaller quantities. There is also a small amount of hematite, pyroxene and sericite. The rock, which is of a granitic composition, contains numerous crystallites and has been subjected to considerable strain and crushing, which has resulted in foliation.
In the hand specimen it is an apparently pure orthoclase but in the thin section small scattered quartz grains are observed; as well as the alteration products, Kaolin and sericite. The minerals at contact are quartz, biotite, magnetite and hornblende. Both the quartz and orthoclase contain dust inclusions and crystallites, while the evidences of shearing and crushing are abundant.
These sounds, made more terrible by the darkness, were like death-knells, calling the men to prepare to meet their doom. And while all on board were contemplating these sounds, the ship suddenly careened a-starboard, a harsh, grating noise was heard overhead, and quantities of broken crystallites began falling on deck. This was followed by a crashing sound, and the ship righted.
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